Tevatron Energy Scan
Energy Dependence of the “Underlying Event”
Proton
Rick Field
Craig Group & David Wilson
CDF
1 mile
University of Florida
AntiProton
Outline of Talk
 Wine & Cheese talk, October 4, 2002.
CDF Run 2
300 GeV, 900 GeV, 1.96 TeV
Studying the underlying event (UE) at CDF.
The PYTHIA UE tunes.

 LPCC MB&UE working group “common plots”.
 CDF MB “common plots” from the Tevatron Energy Scan.
 CDF UE “common plots” from the Tevatron Energy Scan.
 Mapping out the energy dependence of
MB & UE: Tevatron to the LHC!
PT(hard)
Initial-State Radiation
Proton
Fermilab "Wine & Cheese" Talk
September 27, 2013
CMS at the LHC
900 GeV, 7 & 8 TeV
AntiProton
Underlying Event
Underlying Event
 CDF new UE observables from the Tevatron
Energy Scan.
 Summary & Conclusions.
Outgoing Parton
Outgoing Parton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 1
2002 Wine & Cheese Talk
Rick Field Wine & Cheese Talk
October 4, 2002
Fermilab "Wine & Cheese" Talk
September 27, 2013
Studying the “underlying
event” at CDF!
Rick Field – Florida/CDF/CMS
Page 2
UE Publications
"Underlying Event" Publications
25
Number
Tevatron EnergyOthers
Scan: Findings & Surprises,
CDF 20
Collaboration,
coming soon (I hope)!
RDF
15
10
5
0
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
Year
 Publications with “underlying event” in the title.
The Underlying Event in Large Transverse Momentum
Charged Jet and Z−boson Production at CDF, R. Field,
published in the proceedings of DPF 2000.
Charged Jet Evolution and the Underlying Event in
Proton-Antiproton Collisions at 1.8 TeV,
CDF Collaboration, Phys. Rev. D65 (2002) 092002.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 3
QCD Monte-Carlo Models:
High Transverse Momentum Jets
Hard Scattering
Initial-State Radiation
Hard Scattering “Jet”
Initial-State Radiation
“Jet”
Outgoing Parton
PT(hard)
Outgoing Parton
PT(hard)
Proton
“Hard Scattering” Component
AntiProton
Final-State Radiation
Outgoing Parton
Underlying Event
Underlying Event
Proton
“Jet”
Final-State Radiation
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
“Underlying Event”
 Start with the perturbative 2-to-2 (or sometimes 2-to-3) parton-parton scattering and add initial and finalstate gluon radiation (in the leading log approximation or modified leading log approximation).
 The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or
semi-soft multiple parton interactions (MPI).
The “underlying
event” is“jet”
an unavoidable
 Of course the outgoing colored partons fragment
into hadron
and inevitably “underlying event”
background to most collider observables
observables receive contributions from initial
and final-state radiation.
and having good understand of it leads to
more precise collider measurements!
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 4
The Inelastic Non-Diffractive
Cross-Section
Occasionally one of
the parton-parton
collisions is hard
(pT > ≈2 GeV/c)
Proton
Proton
Majority of “minbias” events!
Proton
“Semi-hard” partonparton collision
(pT < ≈2 GeV/c)
Proton
+
Proton
+
Proton
Proton
Proton
+
Proton
Proton
+…
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Multiple-parton
interactions (MPI)!
Page 5
The “Underlying Event”
Select inelastic non-diffractive events
that contain a hard scattering
Proton
Hard parton-parton
collisions is hard
(pT > ≈2 GeV/c)
Proton
1/(pT)4→ 1/(pT2+pT02)2
The “underlying-event” (UE)!
Proton
Given that you have one hard
scattering it is more probable to
have MPI! Hence, the UE has
more activity than “min-bias”.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Proton
+
+
Proton
Proton
Rick Field – Florida/CDF/CMS
“Semi-hard” partonparton collision
(pT < ≈2 GeV/c)
Proton
Proton
+…
Multiple-parton
interactions (MPI)!
Page 6
Allow leading hard
scattering to go to
zero pT with same
cut-off as the MPI!
Model of sND
Proton
Proton
Proton
Proton
Proton
+
Proton
“Semi-hard” partonparton collision
(pT < ≈2 GeV/c)
1/(pT)4→ 1/(pT2+pT02)2
Model of the inelastic nondiffractive cross section!
+
Proton
Proton
Proton
+
Proton
Proton
+…
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Multiple-parton
interactions (MPI)!
Page 7
UE Tunes
Allow primary hard-scattering to
go to pT = 0 with same cut-off!
“Underlying Event”
Fit the “underlying
event” in a hard
scattering process.
Proton
Proton
1/(pT)4→ 1/(pT2+pT02)2
“Min-Bias”
“Min-Bias” (add
(ND)single & double diffraction)
Proton
Predict MB (ND)!
Proton
+
+
Proton
Proton
Proton
Single Diffraction
Predict MB (IN)!
+…
Fermilab "Wine & Cheese" Talk
September 27, 2013
Proton
+
Proton
Proton
Double Diffraction
M2
M
Rick Field – Florida/CDF/CMS
M1
Page 8
Tuning PYTHIA 6.2:
Multiple Parton Interaction Parameters
Parameter
Default
PARP(83)
0.5
Double-Gaussian: Fraction of total hadronic
matter within PARP(84)
PARP(84)
0.2
Double-Gaussian: Fraction of the overall hadron
radius containing the fraction PARP(83) of the
total hadronic matter.
Determines the energy
Probability
that of
thethe
MPI
produces two gluons
dependence
MPI!
with color connections to the “nearest neighbors.
0.33
PARP(86)
0.66
PARP(89)
PARP(82)
PARP(90)
PARP(67)
1 TeV
1.9
GeV/c
0.16
1.0
Multiple Parton Interaction
Color String
Color String
Remember the energy dependence
Multiple PartonDetermine
Interactionby comparing
with 630 GeV data!
of the “underlying event”
activity depends on both the
Determines the reference energy E .
e = PARP(90) and the PDF!
Probability thatAffects
the MPI
theproduces
amount two
of gluons
either as described
by PARP(85)
or as a closed
initial-state
radiation!
gluon loop. The remaining fraction consists of
quark-antiquark pairs.
Color String
Hard-Scattering Cut-Off PT0
0
The cut-off PT0 that regulates the 2-to-2
scattering divergence 1/PT4→1/(PT2+PT02)2
Determines the energy dependence of the cut-off
PT0 as follows PT0(Ecm) = PT0(Ecm/E0)e with
e = PARP(90)
A scale factor that determines the maximum
parton virtuality for space-like showers. The
larger the value of PARP(67) the more initialstate radiation.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
5
PYTHIA 6.206
e = 0.25 (Set A))
4
PT0 (GeV/c)
PARP(85)
Description
Take E0 = 1.8 TeV
3
2
e = 0.16 (default)
1
100
1,000
10,000
100,000
CM Energy W (GeV)
Reference point
at 1.8 TeV
Page 9
Traditional Approach
CDF Run 1 Analysis Charged Particle Df Correlations
Leading Calorimeter Jet or
Charged Jet #1
Leading Charged Particle Jet or
PT > PTmin |h| < hcut
Direction
Leading Charged Particle or
2
“Transverse” region
very sensitive to the
“underlying event”!
Away RegionZ-Boson
“Toward-Side” Jet
Df
“Toward”
“Transverse”
“Transverse”
“Away”
Leading Object
Direction
Df
“Toward”
“Transverse”
“Transverse”
Transverse
Region
f
Leading
Object
Toward Region
Transverse
Region
“Away”
Away Region
0
-hcut
“Away-Side” Jet
h
+hcut
 Look at charged particle correlations in the azimuthal angle Df relative to a leading object (i.e.
CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c hcut = 1.
 Define |Df| < 60o as “Toward”, 60o < |Df| < 120o as “Transverse”, and |Df| > 120o as

“Away”.
o
All three regions have the same area in h-f space, Dh×Df = 2hcut×120 = 2hcut×2/3. Construct
densities by dividing by the area in h-f space.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 10
UE Observables
 “Transverse” Charged Particle Density: Number of charged
particles (pT > 0.5 GeV/c, |h| < hcut) in the “transverse” region as
defined by the leading charged particle, PTmax, divided by the
area in h-f space, 2hcut×2/3, averaged over all events with at least
one particle with pT > 0.5 GeV/c, |h| < hcut.
 “Transverse” Charged PTsum Density: Scalar pT sum of the
charged particles (pT > 0.5 GeV/c, |h| < hcut) in the “transverse”
region as defined by the leading charged particle, PTmax, divided
by the area in h-f space, 2hcut×2/3, averaged over all events with
at least one particle with pT > 0.5 GeV/c, |h| < hcut.
PTmax Direction
Df
“Toward”
“Transverse”
“Transverse”
“Away”
 “Transverse” Charged Particle Average PT: Event-by-event <pT> = PTsum/Nchg for charged
particles (pT > 0.5 GeV/c, |h| < hcut) in the “transverse” region as defined by the leading
charged particle, PTmax, averaged over all events with at least one particle in the
“transverse” region with pT > 0.5 GeV/c, |h| < hcut.
 Zero “Transverse” Charged Particles: If there are no charged particles in the “transverse”
region then Nchg and PTsum are zero and one includes these zeros in the average over all
events with at least one particle with pT > 0.5 GeV/c, |h| < hcut. However, if there are no
charged particles in the “transverse” region then the event is not used in constructing the
“transverse” average pT.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 11
PYTHIA 6.206 Defaults
MPI constant
probability
scattering
PYTHIA default parameters
6.115
6.125
6.158
6.206
MSTP(81)
1
1
1
1
MSTP(82)
1
1
1
1
PARP(81)
1.4
PARP(82)
1.55
PARP(89)
CDF Data
Pythia 6.206 (default)
MSTP(82)=1
PARP(81) = 1.9 GeV/c
data uncorrected
theory corrected
0.75
0.50
1.9
1.9 the “underlying event”
Remember
2.1
2.1
1.9
activity
depends on both the
1,000 1,000 1,000
cut-off
pT0 and the PDF!
0.16
0.16
0.16
1.9
0.25
1.8 TeV |h|<1.0 PT>0.5 GeV
0.00
0
PARP(90)
PARP(67)
1.00
"Transverse" Charged Density
Parameter
"Transverse" Charged Particle Density: dN/dhdf
5
10
15
20
25
30
35
40
45
50
PT(charged jet#1) (GeV/c)
4.0
4.0
1.0
1.0
CTEQ3L
CTEQ4L
CTEQ5L
CDF Min-Bias
CDF JET20
 Plot shows the “Transverse” charged particle density versus PT(chgjet#1) compared to
the QCD hard scattering predictions of PYTHIA 6.206 (PT(hard) > 0) using the default
parameters for multiple parton interactions and CTEQ3L, CTEQ4L, and CTEQ5L.
Note Change
PARP(67) = 4.0 (< 6.138)
PARP(67) = 1.0 (> 6.138)
Fermilab "Wine & Cheese" Talk
September 27, 2013
Default parameters give
very poor description of
the “underlying event”!
Rick Field – Florida/CDF/CMS
Page 12
Run 1 PYTHIA Tune A
PYTHIA 6.206 CTEQ5L
CDF Default Feburary 25, 2000!
"Transverse" Charged Particle Density: dN/dhdf
Parameter
Tune B
Tune A
MSTP(81)
1
1
MSTP(82)
4
4
PARP(82)
1.9 GeV
2.0 GeV
PARP(83)
0.5
0.5
PARP(84)
0.4
0.4
PARP(85)
1.0
0.9
"Transverse" Charged Density
1.00
CDF Preliminary
0.75
1.0
0.95
PARP(89)
1.8 TeV
1.8 TeV
PARP(90)
0.25
0.25
PARP(67)
1.0
4.0
New PYTHIA default
(less initial-state radiation)
Fermilab "Wine & Cheese" Talk
September 27, 2013
Run 1 Analysis
0.50
0.25
CTEQ5L
PYTHIA 6.206 (Set B)
PARP(67)=1
1.8 TeV |h|<1.0 PT>0.5 GeV
0.00
0
PARP(86)
PYTHIA 6.206 (Set A)
PARP(67)=4
data uncorrected
theory corrected
5
10
15
20
25
30
35
40
45
50
PT(charged jet#1) (GeV/c)
 Plot shows the “transverse” charged particle density
versus PT(chgjet#1) compared to the QCD hard
scattering predictions of two tuned versions of
PYTHIA 6.206 (CTEQ5L, Set B (PARP(67)=1) and
Set A (PARP(67)=4)).
Old PYTHIA default
(more initial-state radiation)
Rick Field – Florida/CDF/CMS
Page 13
All use LO as
with L = 192 MeV!
PYTHIA 6.2 Tunes
UE Parameters
ISR Parameter
Parameter
Tune AW
Tune DW
Tune D6
PDF
CTEQ5L
CTEQ5L
CTEQ6L
MSTP(81)
1
1
1
MSTP(82)
4
4
4
PARP(82)
2.0 GeV
1.9 GeV
1.8 GeV
PARP(83)
0.5
0.5
0.5
PARP(84)
0.4
0.4
0.4
PARP(85)
0.9
1.0
1.0
PARP(86)
0.95
1.0
1.0
PARP(89)
1.8 TeV
1.8 TeV
1.8 TeV
PARP(90)
0.25
0.25
0.25
PARP(62)
1.25
1.25
1.25
PARP(64)
0.2
0.2
0.2
PARP(67)
4.0
2.5
2.5
MSTP(91)
1
1
1
PARP(91)
2.1
2.1
2.1
PARP(93)
15.0
15.0
15.0
Uses CTEQ6L
Tune A energy dependence!
Intrinsic KT
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 14
All use LO as
with L = 192 MeV!
PYTHIA 6.2 Tunes
UE Parameters
Parameter
Tune DWT
Tune D6T
ATLAS
PDF
CTEQ5L
CTEQ6L
CTEQ5L
MSTP(81)
1
1
1
MSTP(82)
4
4
4
PARP(82)
1.9409 GeV
1.8387 GeV
1.8 GeV
PARP(83)
0.5
0.5
0.5
PARP(84)
Tune
AW
Tune A
ISR Parameter
0.4
Tune
B
1.0
1.0
0.33
PARP(86)
1.0
1.0
0.66
PARP(89)
1.96 TeV
1.96 TeV
1.0 TeV
PARP(90)
0.16
0.16
0.16
PARP(62)
1.25
1.25
1.0
PARP(64)
0.2
0.2
1.0
PARP(67)
2.5
2.5
1.0
MSTP(91)
1
1
1
PARP(93)
Tune 2.1
DW
15.0
2.1
15.0
ATLAS energy dependence!
Tune BW
1.0
Tune D6
5.0
Tune D6T
Intrinsic KT
Fermilab "Wine & Cheese" Talk
September 27, 2013
0.5
PARP(85)
PARP(91)
Tune D
0.4
Rick Field – Florida/CDF/CMS
Page 15
Transverse Charged Particle Density
RDF LHC Prediction!
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.6
RDF Preliminary
PY64 Tune P329
"Transverse" Charged Density
"Transverse" Charged Density
0.8
generator level
0.6
0.4
PY Tune A
PY64 Tune N324
0.2
PY64 Tune S320
Min-Bias
1.96 TeV
PY Tune DWT
generator level
1.2
0.8
PY64 Tune P329
PY Tune A
0.4
PY Tune DW
PY64 Tune S320
If the LHC data are not in
the range shown here then
we learn new (QCD) physics!
Rick Field October 13, 2009
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
PY ATLAS
RDF Preliminary
Min-Bias
14 TeV
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
0
2
4
6
8
10
12
14
16
18
20
0
5
10
PTmax (GeV/c)
PTmax Direction
Df
“Toward”
“Transverse”
“Transverse”
15
20
25
PTmax (GeV/c)
PTmax Direction
Df
“Toward”
Tevatron
LHC
“Transverse”
“Transverse”
“Away”
“Away”
 Shows the “associated” charged particle density in the “transverse” region as a function of
PTmax for charged particles (pT > 0.5 GeV/c, |h| < 1, not including PTmax) for “min-bias” events
at 1.96 TeV from PYTHIA Tune A, Tune S320, Tune N324, and Tune P329 at the particle level (i.e.
generator level).
 Extrapolations of PYTHIA Tune A, Tune DW, Tune DWT, Tune S320, Tune P329, and pyATLAS to the
LHC.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 16
“Transverse” Charged Particle Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
RDF Preliminary
14 TeV
Min-Bias
"Transverse" Charged Density
"Transverse" Charged Density
1.2
py Tune DW generator level
10 TeV
7 TeV
0.8
1.96 TeV
0.9 TeV
0.4
0.2 TeV
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
RDF Preliminary
LHC14
py Tune DW generator level
0.8
LHC10
LHC7
Tevatron
900 GeV
0.4
PTmax = 5.25 GeV/c
RHIC
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
0
25
2
Df
“Toward”
RHIC
“Transverse”
“Transverse”
0.2 TeV → 1.96 TeV
(UE increase ~2.7 times)
Tevatron
“Away”
6
8
10
12
14
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
PTmax Direction
4
PTmax Direction
Df
“Toward”
“Transverse”
PTmax Direction
1.96 TeV → 14 TeV
(UE increase ~1.9 times)
LHC
“Transverse”
“Away”
Df
“Toward”
“Transverse”
“Transverse”
“Away”
 Shows the “associated” charged particle density in the “transverse” region as a function of
PTmax for charged particles (pT > 0.5 GeV/c, |h| < 1, not including PTmax) for “min-bias” events
at 0.2 TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle
Linear scale!
level (i.e. generator level).
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 17
“Transverse” Charged Particle Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
RDF Preliminary
14 TeV
Min-Bias
"Transverse" Charged Density
"Transverse" Charged Density
1.2
py Tune DW generator level
10 TeV
7 TeV
0.8
1.96 TeV
0.9 TeV
0.4
0.2 TeV
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
RDF Preliminary
py Tune DW generator level
LHC14
LHC10
LHC7
0.8
Tevatron
0.4
900 GeV
RHIC
PTmax = 5.25 GeV/c
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0.1
Df
“Toward”
LHC7
“Transverse”
100.0
PTmax Direction
7 TeV → 14 TeV
(UE increase ~20%)
Df
“Toward”
LHC14
“Transverse”
“Away”
10.0
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
PTmax Direction
1.0
Linear on a log plot!
“Transverse”
“Transverse”
“Away”
 Shows the “associated” charged particle density in the “transverse” region as a function of
PTmax for charged particles (pT > 0.5 GeV/c, |h| < 1, not including PTmax) for “min-bias” events
at 0.2 TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle
Log scale!
level (i.e. generator level).
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 18
“Transverse” Charge Density
"Transverse" Charged Particle Density: dN/dhdf
Rick Field
MB&UE@CMS Workshop
CERN, November 6, 2009
"Transverse" Charged Density
1.2
RDF Preliminary
py Tune DW generator level
7 TeV
0.8
factor of 2!
900 GeV
0.4
Prediction!
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
4
10
0.0
0
2
6
8
12
14
16
18
20
PTmax (GeV/c)
PTmax Direction
Df
LHC
900 GeV
“Toward”
“Transverse”
PTmax Direction
900 GeV → 7 TeV
(UE increase ~ factor of 2)
“Transverse”
“Away”
~0.4 → ~0.8
Df
“Toward”
LHC
7 TeV
“Transverse”
“Transverse”
“Away”
 Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5
GeV/c, |h| < 2) at 900 GeV and 7 TeV as defined by PTmax from PYTHIA Tune DW and at the
particle level (i.e. generator level).
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 19
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
Charged Particle Density
CMS Preliminary
"Transverse" Charged Density
1.2
7 TeV
data uncorrected
pyDW + SIM
0.8
CMS
900 GeV
0.4
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
1.2
RDF Preliminary
7 TeV
ATLAS corrected data
Tune DW generator level
0.8
ATLAS
900 GeV
0.4
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
2
4
6
8
10
 CMS preliminary data at 900 GeV and 7 TeV 
on the “transverse” charged particle density,
dN/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2. The data are
uncorrected and compared with PYTHIA
Tune DW after detector simulation.
16
18
20
ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |h| < 2.5. The data are
corrected and compared with PYTHIA Tune
DW at the generator level.
PT(chgjet#1) Direction
PTmax Direction
Df
Df
“Toward”
“Toward”
“Transverse”
“Transverse”
“Away”
Fermilab "Wine & Cheese" Talk
September 27, 2013
14
PTmax (GeV/c)
PT(chgjet#1) GeV/c
“Transverse”
12
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 20
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
3.0
1.2
CMS Preliminary
7 TeV
data uncorrected
pyDW + SIM
Ratio: 7 TeV/900 GeV
Charged Particle Density
CMS Preliminary
0.8
Ratio
CMS
900 GeV
0.4
data uncorrected
pyDW + SIM
2.0
CMS
1.0
7 TeV / 900 GeV
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
2
4
6
8
10
12
14
16
18
PT(chgjet#1) (GeV/c)
PT(chgjet#1) GeV/c
 CMS preliminary data at 900 GeV and 7 TeV  Ratio of CMS preliminary data at 900 GeV
and 7 TeV on the “transverse” charged
on the “transverse” charged particle density,
particle density, dN/dhdf, as defined by the
dN/dhdf, as defined by the leading charged
leading charged particle jet (chgjet#1) for
particle jet (chgjet#1) for charged particles
charged particles with pT > 0.5 GeV/c and
with pT > 0.5 GeV/c and |h| < 2. The data are
|h| < 2. The data are uncorrected and
uncorrected and compared with PYTHIA
compared with PYTHIA Tune DW after
Tune DW after detector simulation.
PT(chgjet#1) Direction
PT(chgjet#1) Direction
detector simulation.
Df
Df
“Toward”
“Transverse”
“Toward”
“Transverse”
“Transverse”
“Away”
Fermilab "Wine & Cheese" Talk
September 27, 2013
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 21
PYTHIA Tune Z1
 All my previous tunes (A, DW, DWT, D6,
D6T, CW, X1, and X2) were PYTHIA 6.4
tunes using the old Q2-ordered parton
showers and the old MPI model (really 6.2
tunes)!
 I believe that it is time to move to PYTHIA
6.4 (pT-ordered parton showers and new
MPI model)!
 Tune Z1: I started with the parameters of
ATLAS Tune AMBT1, but I changed LO* to
CTEQ5L and I varied PARP(82) and PARP(90)
to get a very good fit of the CMS UE data at 900
GeV and 7 TeV.
 The ATLAS Tune AMBT1 was designed to fit
the inelastic data for Nchg ≥ 6 and to fit the
PTmax UE data with PTmax > 10 GeV/c. Tune
AMBT1 is primarily a min-bias tune, while
Tune Z1 is a UE tune!
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
PARP(90)
PARP(82)
Color
Connections
Diffraction
Outgoing Parton
PT(hard)
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
Underlying Event
Final-State
Radiation
UE&MB@CMS
Page 22
PYTHIA Tune Z1
Tune Z1
(R. Field CMS)
Tune AMBT1
(ATLAS)
CTEQ5L
LO*
PARP(82) – MPI Cut-off
1.932
2.292
PARP(89) – Reference energy, E0
1800.0
1800.0
PARP(90) – MPI Energy Extrapolation
0.275
0.25
PARP(77) – CR Suppression
1.016
1.016
PARP(78) – CR Strength
0.538
0.538
0.1
0.1
PARP(83) – Matter fraction in core
0.356
0.356
PARP(84) – Core of matter overlap
0.651
0.651
PARP(62) – ISR Cut-off
1.025
1.025
PARP(93) – primordial kT-max
10.0
10.0
MSTP(81) – MPI, ISR, FSR, BBR model
21
21
MSTP(82) – Double gaussion matter distribution
4
4
MSTP(91) – Gaussian primordial kT
1
1
MSTP(95) – strategy for color reconnection
6
6
Parameter
Parton Distribution Function
Parameters not
shown are the
PYTHIA 6.4 defaults!
PARP(80) – Probability colored parton from BBR
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 23
CMS UE Data
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
1.2
CMS Preliminary
D6T
7 TeV
data uncorrected
Theory + SIM
Charged Particle Density
Charged Particle Density
CMS Preliminary
0.8
900 GeV
DW
0.4
CMS
7 TeV
data uncorrected
pyZ1 + SIM
0.8
900 GeV
0.4
CMS
Tune Z1
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
5
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are uncorrected and compared
with PYTHIA Tune DW and D6T after
detector simulation (SIM).
Fermilab "Wine & Cheese" Talk
September 27, 2013
15
20
25
30
35
40
45
50
PT(chgjet#1) GeV/c
PT(chgjet#1) GeV/c
Color reconnection suppression.
Color reconnection strength.
10
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are uncorrected and compared
with PYTHIA Tune Z1 after detector
simulation (SIM).
Tune Z1 (CTEQ5L)
PARP(82) = 1.932
PARP(90) = 0.275
PARP(77) = 1.016
PARP(78) = 0.538
Rick Field – Florida/CDF/CMS
Tune Z1 is a PYTHIA 6.4 using
pT-ordered parton showers and
the new MPI model!
Page 24
PYTHIA 6.2 Tunes
UE Parameters
ISR Parameter
Parameter
Tune AW
Tune DW
Tune D6
PDF
CTEQ5L
CTEQ5L
CTEQ6L
MSTP(81)
1
1
1
MSTP(82)
4
4
4
PARP(82)
2.0 GeV
1.9 GeV
1.8 GeV
PARP(83)
0.5
0.5
0.5
PARP(84)
0.4
0.4
0.4
PARP(85)
0.9
1.0
1.0
PARP(86)
0.95
1.0
1.0
PARP(89)
1.8 TeV
1.8 TeV
1.8 TeV
PARP(90)
0.25
0.25
0.25
PARP(62)
1.25
1.25
1.25
PARP(64)
0.2
0.2
0.2
PARP(67)
4.0
2.5
2.5
MSTP(91)
1
1
1
PARP(91)
2.1
2.1
2.1
PARP(93)
15.0
15.0
15.0
Uses CTEQ6L
Reduce PARP(82) by
factor of 1.8/1.9 = 0.95
Everything else the same!
Tune A energy dependence!
(not the default)
Intrinsic KT
CMS: We wanted a CTEQ6L version of Tune Z1 in a hurry!
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 25
PYTHIA Tune Z2
My guess!
Tune Z1
(R. Field CMS)
Tune Z2
(R. Field CMS)
CTEQ5L
CTEQ6L
PARP(82) – MPI Cut-off
1.932
1.832
PARP(89) – Reference energy, E0
1800.0
1800.0
PARP(90) – MPI Energy Extrapolation
0.275
0.275
PARP(77) – CR Suppression
1.016
1.016
PARP(78) – CR Strength
0.538
0.538
0.1
0.1
PARP(83) – Matter fraction in core
0.356
0.356
PARP(84) – Core of matter overlap
0.651
0.651
PARP(62) – ISR Cut-off
1.025
1.025
PARP(93) – primordial kT-max
10.0
10.0
MSTP(81) – MPI, ISR, FSR, BBR model
21
21
MSTP(82) – Double gaussion matter distribution
4
4
MSTP(91) – Gaussian primordial kT
1
1
MSTP(95) – strategy for color reconnection
6
6
Parameter
Parton Distribution Function
PARP(80) – Probability colored parton from BBR
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Reduce PARP(82) by
factor of 1.83/1.93 = 0.95
Everything else the same!
Page 26
PYTHIA Tune Z2
My guess!
Tune Z1
(R. Field CMS)
Tune Z2
(R. Field CMS)
CTEQ5L
CTEQ6L
PARP(82) – MPI Cut-off
1.932
1.832
PARP(89) – Reference energy, E0
1800.0
1800.0
PARP(90) – MPI Energy Extrapolation
0.275
0.275
PARP(77) – CR Suppression
1.016
1.016
PARP(78) – CR Strength
0.538
0.538
0.1
0.1
PARP(83) – Matter fraction in core
0.356
0.356
PARP(84) – Core of matter overlap
0.651
0.651
PARP(62) – ISR Cut-off
1.025
1.025
PARP(93) – primordial kT-max
10.0
10.0
MSTP(81) – MPI, ISR, FSR, BBR model
21
21
MSTP(82) – Double gaussion matter distribution
4
4
MSTP(91) – Gaussian primordial kT
1
1
MSTP(95) – strategy for color reconnection
6
6
Parameter
Parton Distribution Function
PARP(80) – Probability colored parton from BBR
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Reduce PARP(82) by
factor of 1.83/1.93 = 0.95
Everything else the same!
PARP(90) same
For Z1 and Z2!
Page 27
PYTHIA 6.4 Tune Z2
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged Particle Density: dN/dhdf
2.0
CMS Preliminary
CMS Preliminary
data corrected
Tune Z1 generator level
7 TeV
PTsum Density (GeV/c)
Charged Particle Density
1.6
1.2
0.8
900 GeV
CMS
0.4
Tune Z1
data corrected
Tune Z1 generator level
1.6
7 TeV
1.2
CMS
0.8
900 GeV
Tune Z1
0.4
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
10
20
30
40
50
60
70
80
90
100
0
10
PT(chgjet#1) GeV/c
Fermilab "Wine & Cheese" Talk
September 27, 2013
30
40
50
60
70
80
90
100
PT(chgjet#1) GeV/c
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CMS corrected
data!
20
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
Very nice agreement!
Rick Field – Florida/CDF/CMS
CMS corrected
data!
Page 28
PYTHIA 6.4 Tune Z2
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged Particle Density: dN/dhdf
2.0
CMS Preliminary
CMS Preliminary
data corrected
Tune Z2 generator level
7 TeV
PTsum Density (GeV/c)
Charged Particle Density
1.6
1.2
0.8
900 GeV
Tune Z2
0.4
data corrected
Tune Z2 generator level
1.6
7 TeV
1.2
0.8
900 GeV
Tune Z2
0.4
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
10
20
30
40
50
60
70
80
90
100
0
10
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are corrected and compared with
PYTHIA Tune Z2 at the generator level.
Fermilab "Wine & Cheese" Talk
September 27, 2013
30
40
50
60
70
80
90
100
PT(chgjet#1) GeV/c
PT(chgjet#1) GeV/c
CMS corrected
data!
20
 CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dhdf, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |h| < 2.0.
The data are corrected and compared with
PYTHIA Tune Z2 at the generator level.
Not good! Bad energy dependence!
Rick Field – Florida/CDF/CMS
CMS corrected
data!
Page 29
PYTHIA Tune Z2*
Tune Z1
(R. Field CMS)
Tune Z2
(R. Field CMS)
Tune Z2*
(CMS)
CTEQ5L
CTEQ6L
CTEQ6L
PARP(82) – MPI Cut-off
1.932
1.832
1.93
PARP(89) – Reference energy, E0
1800.0
1800.0
1800.0
PARP(90) – MPI Energy Extrapolation
0.275
0.275
0.23
PARP(77) – CR Suppression
1.016
1.016
1.016
0.538
A. Knutsson & M. Zakaria
PARP(80) – Probability colored parton from
0.1
usingBBR
Rivet & the Professor
0.538
0.538
0.1
0.1
PARP(83) – Matter fraction in core
0.356
0.356
0.356
PARP(84) – Core of matter overlap
0.651
0.651
0.651
PARP(62) – ISR Cut-off
1.025
1.025
1.025
PARP(93) – primordial kT-max
10.0
10.0
10.0
MSTP(81) – MPI, ISR, FSR, BBR model
21
21
21
MSTP(82) – Double gaussion matter distribution
4
4
4
MSTP(91) – Gaussian primordial kT
1
1
1
MSTP(95) – strategy for color reconnection
6
6
6
Parameter
Parton Distribution Function
PARP(78) – CR Strength
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 30
MB&UE Working Group
MB & UE Common Plots
CMS
ATLAS
 The LPCC MB&UE Working Group has suggested
several MB&UE “Common Plots” the all the LHC
groups can produce and compare with each other.
Outgoing Parton
“Minimum Bias” Collisions
PT(hard)
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
Proton
Proton
Underlying Event
Final-State
Radiation
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 31
MB Common Plots 7 TeV
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 32
CMS Common Plots
Observable
900 GeV
7 TeV
MB1: dNchg/dh Nchg ≥ 1
|h| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c
Done
QCD-10-024
Done
QCD-10-024
Stalled
Stalled
MB2: dNchg/dpT Nchg ≥ 1 |h| < 0.8
that all the “common plots” require
MB3: Multiplicity Note
Distribution
Stalled
one charged
particle with Stalled
|h| < 0.8 pT > 0.5 GeV/cat&least
1.0 GeV/c
p > 0.5 GeV/c and |h| < 0.8!
MB4: <pT> versus Nchg T
In progress
This done so that the plots are
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
(Antwerp)
In progress
(Antwerp)
UE1: Transverse Nchg & PTsum as
defined by the leading charged
particle, PTmax
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
Done
FSQ-12-020
less sensitive to SD and DD.
Done
FSQ-12-020
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 33
Tevatron Energy Scan
Proton
CDF
1 mile
AntiProton
Special thanks to Mike Albrow,
Michelangelo Mangano,
Rob Roser,
Proton
900GeV
GeV
300
1.96
TeV
and everyone that helped make
this
happen!
AntiProton
 Just before the shutdown of the Tevatron CDF
has collected more than 10M “min-bias” events
at several center-of-mass energies!
300 GeV 12.1M MB Events
900 GeV 54.3M MB Events
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 34
CDF Common Plots
Observable
MB1: dNchg/dh Nchg ≥ 1
|h| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c
MB2: dNchg/dpT Nchg ≥ 1 |h| < 0.8
300 GeV
900 GeV
1.96 TeV
Done
Done
Done
In progress
In progress
In progress
MB3: Multiplicity Distribution
Special thanksInto
Mary
progress
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
Convery,
In progress
Ray Culbertson, and Jonathan Lewis
MB4: <pT> versus Nchg
for their helpInwith
the datasets!
progress
In progress
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
UE1: Transverse Nchg & PTsum as
defined by the leading charged
particle, PTmax
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
pT > 0.5 GeV/c
Done
In progress
In progress
pT > 0.5 GeV/c pT > 0.5 GeV/c
Done
Done
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
R. Field, C. Group, and D. Wilson.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 35
MB Common Plots 900 GeV
Pseudo-Rapidity Distribution: dN/dh
Pseudo-Rapidity Distribution: dN/dh
1.15
2.2
RDF Preliminary
CDF
RDF Preliminary
900 GeV
2.0
1.8
CMS
1.6
ATLAS
ALICE
900 GeV
Corrected Data
Average Number
Average Number
Corrected Data
1.10
1.05
1.00
At least 1 charged particle
CDF
CMS
ATLAS
ALICE
At least 1 charged
particle
Charged Particles (|h|<0.8, PT>1.0 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
1.4
0.95
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
-1.0
-0.8
Pseudo-Rapidity
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
Pseudo-Rapidity
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 36
1.0
New CDF MB Data
CMS
Pseudo-Rapidity Distribution:
Distribution: dN/dh
dN/dh
2.5
3
4
RDF
Preliminary
CDF
Preliminary
RDF
Preliminary
Average
Number
AverageNumber
Number
Average
Corrected
Data
Corrected
Data
Corrected
Data
3
2
900 GeV
7 TeV
1.96 TeV
CDF
CDF
2.0
2
CDF
CDF
1
1
1.96 TeV
900 GeV
900 GeV
300 GeV
300 GeV
Atleast
least11charged
chargedparticle
particle
At
CMS Tune Z1
0
1.5
-1.0
-1.0
-0.8
-0.8
-0.6
-0.6
-0.6
Charged
Particles
(|h|<0.8,
PT>0.5
GeV/c)
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
-0.4
-0.4
-0.4
-0.2
-0.2
-0.2
0.0
0.0
0.0
0.2
0.2
0.2
0.4
0.4
0.4
0.6
0.6
0.6
0.8
0.8
1.0
1.0
Pseudo-Rapidity
Pseudo-Rapidity
Pseudo-Rapidity
 New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on on pseudo-rapidity
distribution of charged particles, dN/dh, with pT > 0.5 GeV/c. Events are required to
have at least one charged particle with |h| < 0.8 and pT > 0.5 GeV/c. The data are
corrected to the particle level with errors that include both the statistical error and
the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 37
New CDF MB Data
CMS
Pseudo-Rapidity
Pseudo-Rapidity Distribution:
Distribution: dN/dh
dN/dh
1.2
1.5
2.0
CDFPreliminary
RDF
Preliminary
RDF
Average
AverageNumber
Number
7 TeV
CDF
CorrectedData
Data
Corrected
Data
Corrected
1.96 TeV
1.1
1.5
1.96 TeV
CDF
CDF
1.0
0.9
CDF
1.0
CMS
900 GeV
900 GeV
300 GeV
300 GeV
0.5
0.8
0.5
-1.0
-1.0
900 GeV
-0.8
-0.8
-0.6
-0.6
Tune Z1
-0.4
-0.4
-0.2
-0.2
At least 1 charged
AtAtleast
least1 1charged
chargedparticle
particle
particle
Charged
Particles
(|h|<0.8,
PT>1.0
GeV/c)
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>1.0
PT>1.0GeV/c)
GeV/c)
0.0
0.0
0.2
0.2
0.4
0.4
0.6
0.6
0.8
0.8
1.0
1.0
Pseudo-Rapidity
Pseudo-Rapidity
 New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on on pseudo-rapidity
distribution of charged particles, dN/dh, with pT > 1.0 GeV/c. Events are required to
have at least one charged particle with |h| < 0.8 and pT > 1.0 GeV/c. The data are
corrected to the particle level with errors that include both the statistical error and
the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 38
Energy Dependence dN/dh
Pseudo-Rapidity Distribution:
Distribution: dN/dh(h=0)
dN/dh(h=0)
Pseudo-Rapidity
3.5
3.5
RDF Preliminary
Preliminary
RDF
Average Number
3.0
3.0
Corrected Data
Data
Corrected
CDF black
black dots
dots
CDF
CMS red
red squares
squares
CMS
Tune Z1
2.5
2.5
2.0
2.0
At least
least 11 charged
charged particle
particle
At
1.5
1.5
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
1.0
1.0
0.1
0.1
1.0
1.0
10.0
10.0
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass
 CMS data at 7 TeV and 900 GeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on
dN/dh at h = 0 with pT > 0.5 GeV/c as a function of the center-of-mass energy. Events
are required to have at least one charged particle with |h| < 0.8 and pT > 0.5 GeV/c.
The data are corrected to the particle level with errors that include both the
statistical error and the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 39
Energy Dependence dN/dh
Pseudo-Rapidity Distribution: dN/dh(h=0)
2.0
RDF Preliminary
Average Number
Corrected Data
CDF black dots
CMS red squares
Tune Z1
1.5
1.0
At least 1 charged particle
Charged Particles (|h|<0.8, PT>1.0 GeV/c)
0.5
0.1
1.0
10.0
Center-of-Mass Energy (GeV)
 CMS data at 7 TeV and 900 GeV and CDF data at 1.96 TeV, 900 GeV, and 300 GeV on
dN/dh at h = 0 with pT > 1.0 GeV/c as a function of the center-of-mass energy. Events
are required to have at least one charged particle with |h| < 0.8 and pT > 1.0 GeV/c.
The data are corrected to the particle level with errors that include both the
statistical error and the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 40
Overall Charged Particle Density
Overall Charged Particle Density
Pseudo-Rapidity Distribution: dN/dh
3
0.50
CDF Preliminary
Corrected Data
2
900 GeV
300 GeV
1
Charged Density
Average Number
RDF Preliminary
1.96 TeV
Corrected Data
CMS red squares
CDF blue dots
0.40
0.30
At least 1 charged particle
At least 1 charged particle
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.20
0
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
0.1
1.0
Pseudo-Rapidity
 Corrected CDF data on the pseudo-rapidity 
distribution, dN/dh, for charged with pT > 0.5
GeV/c and |h| < 0.8 for events with at least one
charged particle with pT > 0.5 GeV/c and |h| <
0.8.
Ecm
Nchg
error
NchgDen
error
300 GeV
2.241
0.175
0.223
0.017
900 GeV
3.012
0.203
0.300
0.020
1.96 TeV
3.439
0.186
0.342
0.019
Fermilab "Wine & Cheese" Talk
September 27, 2013
1.0
10.0
Center-of-Mass Energy (TeV)
Corrected CDF and CMS data overall density of
charged particles with pT > 0.5 GeV/c and |h| <
0.8 for events with at least one charged particle
with pT > 0.5 GeV/c and |h| < 0.8 plotted versus
the center-of-mass energy (log scale). The data
are corrected to the particle level with errors
that include both the statistical error and the
systematic uncertainty.
0.8
N chg 
dN
0.8 dh dh
Rick Field – Florida/CDF/CMS
Page 41
New UE Observables
 “transMAX” and “transMIN” Charged Particle Density: Number
of charged particles (pT > 0.5 GeV/c, |h| < 0.8) in the the maximum
(minimum) of the two “transverse” regions as defined by the
leading charged particle, PTmax, divided by the area in h-f space,
2hcut×2/6, averaged over all events with at least one particle with
pT > 0.5 GeV/c, |h| < hcut.
 “transMAX” and “transMIN” Charged PTsum Density: Scalar pT
sum of charged particles (pT > 0.5 GeV/c, |h| < 0.8) in the the
maximum (minimum) of the two “transverse” regions as defined
by the leading charged particle, PTmax, divided by the area in h-f
space, 2hcut×2/6, averaged over all events with at least one particle
with pT > 0.5 GeV/c, |h| < hcut.
PTmax Direction
Df
“Toward”
“TransMAX”
“TransMIN”
“Away”
Note: The overall “transverse” density is equal to the average of the “transMAX” and
“TransMIN” densities. The “TransDIF” Density is the “transMAX” Density minus the
“transMIN” Density
“Transverse” Density = “transAVE” Density = (“transMAX” Density + “transMIN” Density)/2
“TransDIF” Density = “transMAX” Density - “transMIN” Density
hcut = 0.8
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 42
“transMIN” & “transDIF”
 The “toward” region contains the leading “jet”, while the “away”
region, on the average, contains the “away-side” “jet”. The
“transverse” region is perpendicular to the plane of the hard 2-to-2
scattering and is very sensitive to the “underlying event”. For
events with large initial or final-state radiation the “transMAX”
region defined contains the third jet while both the “transMAX”
and “transMIN” regions receive contributions from the MPI and
beam-beam remnants. Thus, the “transMIN” region is very
sensitive to the multiple parton interactions (MPI) and beam-beam
remnants (BBR), while the “transMAX” minus the “transMIN”
(i.e. “transDIF”) is very sensitive to initial-state radiation (ISR) Jet #3
and final-state radiation (FSR).
“TransMIN” density more sensitive to MPI & BBR.
PTmax Direction
“Toward-Side” Jet
Df
“Toward”
“TransMAX”
“TransMIN”
“Away”
“Away-Side” Jet
“TransDIF” density more sensitive to ISR & FSR.
0 ≤ “TransDIF” ≤ 2×”TransAVE”
“TransDIF” = “TransAVE” if “TransMIX” = 3×”TransMIN”
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 43
PTmax UE Data
 CDF PTmax UE Analysis: “transMAX”, “transMIN”, “transAVE”,
and “transDIF” charged particle and PTsum densities (pT > 0.5
GeV/c, |h| < 0.8) in proton-antiproton collisions at 300 GeV, 900
GeV, and 1.96 TeV (R. Field analysis).
 CMS PTmax UE Analysis: “transMAX”, “transMIN”,
“transAVE”, and “transDIF” charged particle and PTsum densities
(pT > 0.5 GeV/c, |h| < 0.8) in proton-proton collisions at 900 GeV
and 7 TeV (M. Zakaria analysis). The “transMAX”, “transMIN”,
and “transDIF” are not yet approved so I can only show
“transAVE” which is approved.
PTmax Direction
Df
“Toward”
“TransMAX”
“TransMIN”
“Away”
 CMS UE Tunes: PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4
Tune Z2* (CTEQ6L). Both were tuned to the CMS leading chgjet
“transAVE” UE data at 900 GeV and 7 TeV.
 PYTHIA 8: Some comparisons with PYTHIA 8 Tune 4C
(CTEQ6L), Richard Corke and Torbjörn Sjöstrand, JHEP
1103:032 (2011), arXiv:1011.1759.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 44
UE Common Plots
"Transverse"
"Transverse"
"Transverse"Charged
Charged
ChargedPTsum
PTsum
PTsumDensity:
Density:
Density:dPT/dhdf
dPT/dhdf
dPT/dhdf
1.5
1.5 RDF Preliminary
RDF Preliminary
1.6
1.6
1.6
corrected
correcteddata
data
corrected
data
Tune Z1 generator level
RDF
RDFPreliminary
Preliminary
corrected
data
corrected
data
Tune Z1 generator level
PTsum Density (GeV/c)
(GeV/c)
PTsum
PTsum Density
Density (GeV/c)
"Transverse"Charged
ChargedDensity
Density
"Transverse"
Charged
Density
"Transverse"
"Transverse"
"Transverse"Charged
ChargedParticle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
1.2
1.2
1.2
1.0
1.0
0.8
0.8
0.8
0.5
0.5
CMS
CMS(solid
(solidred)
red)
ATLAS
ATLAS
(solid
blue)
ATLAS(solid
(solidblue)
blue)
ALICE
ALICE
(open
black)
ALICE(open
(openblack)
black)
5
55
CMS
CMS(solid
(solidred)
red)
ATLAS
(solid
blue)
ATLAS
ATLAS
(solid
(solid
blue)
blue)
Charged
Particles
(|h|
<<<
0.8,
PT
>>>
0.5
GeV/c)
Charged
Particles
Particles
(|h|
(|h|
0.8,
0.8,
PT
PT
0.5
0.5
GeV/c)
GeV/c)
ALICE
(open
black)
ALICE
ALICE
(open
(open
black)
black) Charged
Charged
Charged
Particles
(|h|
0.8,
PT
0.5
GeV/c)
ChargedParticles
Particles(|h|
(|h|<<<0.8,
0.8,PT
PT>>>0.5
0.5GeV/c)
GeV/c)
0.0
0.0
0.0
0
00
777TeV
TeV
TeV
0.4
0.4
0.4
77TeV
TeV
10
10
10
15
15
15
20
20
20
25
25
25
30
30
30
0.0
0.0
0.0
000
555
10
10
10
0.8
0.8
0.8
0.6
0.6
0.6
"Transverse"
Charged Particle
Density: dN/dhdf
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
25
25
25
30
30
30
"Transverse"
"Transverse"
Charged
PTsum
Density:
dPT/dhdf
"Transverse"Charged
ChargedPTsum
PTsumDensity:
Density:dPT/dhdf
dPT/dhdf
0.8
0.8
0.8
RDF
RDFPreliminary
Preliminary
RDF
Preliminary
corrected
correcteddata
data
corrected
data
Tune Z1 generator level
0.6
0.6
0.6
0.4
0.4
0.4
RDF
RDFPreliminary
Preliminary
corrected
correcteddata
data
Tune Z1 generator level
0.4
0.4
0.4
0.2
0.2
0.2
0.0
0.0
0.0
20
20
20
PTmax
PTmax
PTmax(GeV/c)
(GeV/c)
(GeV/c)
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum
PTsum
Density (GeV/c)
"Transverse"Charged
ChargedDensity
Density
"Transverse"
Charged
Density
"Transverse"
PTmax
PTmax (GeV/c)
(GeV/c)
15
15
15
0.2
0.2
0.2
CMS
CMS (solid
(solid red)
red)
900
GeV
900
ATLAS
(solid blue)
900 GeV
GeV
ATLAS
ATLAS (solid
(solid blue)
blue) Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
ALICE
(open black)
ALICE
ALICE (open
(open black)
black) Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
00
0
22
2
44
4
66
6
88
8
10
10
10
12
12
12
14
14
14
0.0
0.0
0.0
000
CMS
CMS(solid
(solidred)
red)
ATLAS
ATLAS
(solid
blue)
ATLAS(solid
(solidblue)
blue)
ALICE
ALICE
(open
black)
ALICE(open
(openblack)
black)
222
PTmax
(GeV/c)
PTmax
PTmax (GeV/c)
(GeV/c)
Fermilab "Wine & Cheese" Talk
September 27, 2013
444
900
900
GeV
900GeV
GeV
Charged
Charged
Particles
(|h|
0.8,
PT
0.5
GeV/c)
ChargedParticles
Particles(|h|
(|h|<<<0.8,
0.8,PT
PT>>>0.5
0.5GeV/c)
GeV/c)
666
888
10
10
10
12
12
12
PTmax
PTmax
(GeV/c)
PTmax (GeV/c)
(GeV/c)
Rick Field – Florida/CDF/CMS
Page 45
14
14
14
LHC
CDF versus CMS
"TransAVE" Charged Particle Density: dN/dhdf
"TransAVE"
"TransAVE" Charged
Charged PTsum
PTsum Density:
Density: dPT/dhdf
dPT/dhdf
0.75
0.78
0.78
RDF
RDF Preliminary
Preliminary
corrected
corrected data
data
CDF
CDF
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum
Charged Particle Density
RDF
RDF Preliminary
Preliminary
0.50
0.25
CMS
CMS
ATLAS
ALICE
900
900 GeV
GeV
0
4
8
12
16
CDF
CDF
ALICE
0.52
0.52
ATLAS
0.26
0.26
CMS
CMS
900
900 GeV
GeV
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.00
corrected
corrected data
data
0.00
0.00
20
00
PTmax (GeV/c)
44
88
12
12
16
16
PTmax
PTmax (GeV/c)
(GeV/c)
 CDF and CMS data at 900 GeV/c on the
 CDF and CMS data at 900 GeV/c on the
charged PTsum density in the “transverse”
charged particle density in the “transverse”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8. The data are
pT > 0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors
corrected to the particle level with errors
that include both the statistical error and
that include both the statistical error and
the systematic uncertainty.
the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 46
20
20
“TransAVE” Density
"Transverse" Charged PTsum Density: dPT/dhdf
"TransAVE" Charged Particle Density: dN/dhdf
RDF Preliminary
Corrected Data
Generator Level Theory
1.5
RDF Preliminary
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
PTsum Density (GeV/c)
Charged Particle Density
1.5
7 TeV
1.0
1.96 TeV
900 GeV
0.5
300 GeV
7 TeV
Corrected Data
Generator Level Theory
1.0
1.96 TeV
900 GeV
0.5
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
PTmax (GeV/c)
PTmax (GeV/c)
 Corrected CMS data at 7 TeV and CDF data  Corrected CMS data at 7 TeV and CDF data
at 1.96 TeV, 900 GeV, and 300 GeV on the
at 1.96 TeV, 900 GeV, and 300 GeV on the
charged particle density in the “transAVE”
charged PTsum density in the “transAVE”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8. The data are
pT > 0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors that
corrected to the particle level with errors that
include both the statistical error and the
include both the statistical error and the
systematic uncertainty. The data are
systematic uncertainty. The data are
compared with PYTHIA Tune Z1 and Tune
compared with PYTHIA Tune Z1 and Tune
Z2*.
Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 47
“TransAVE” vs Ecm
"TransAVE"
Charged
Particle
Density
Ratio
"TransAVE"
Charged
Particle
Density:
dN/dhdf
"TransAVE"
Charged
Particle
Density
Ratio
RDF
RDF Preliminary
Preliminary
corrected
correcteddata
data
generator
generatorlevel
leveltheory
theory
0.8
2.6
3.2
1.1
4.0
4.0
CMS
solid
dotsdots
CMS
solid
CDF
solid
squares
CDF
solid
squares
CDF
Tune Z2* (solid lines)
TuneZ1
Z2*(dashed
(solid lines)
Tune
lines)
Tune
Z1Z2*
(dashed
Tune
(solidlines)
lines)
Tune Z1 (dashed lines)
Divided by 300 GeV Value
0.5
1.8
2.1
Divided by 300 GeV Value
5.0
<PTmax
PTmax
<6.0
6.0
GeV/c
5.0
GeV/c
5.0
< <PTmax
< <6.0
GeV/c
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.2
1.0
1.0
0.1
0.1
1.0
1.0
10.0
10.0
100.0
Charged
PTsum
Density
(GeV/c)
Particle
Density
Ratio
Particle
Density
Ratio
Charged
ParticleParticle
DensityDensity
Ratio
Particle
Density
Ratio
1.1
3.4
4.3
"TransAVE"
Charged
PTsum
Density:
dPT/dhdf
"TransAVE"
Charged
PTsum
Density
Ratio
"TransAVE"
Charged
PTsum
Density
Ratio
RDF Preliminary
RDF Preliminary
CMS
solid dots
CMS
CMSsolid
soliddots
dots
CDF
solid
squares
CDF
solid
CDF solidsquares
squares
corrected data
corrected data
generator level theory
generator level theory
0.8
3.0
3.0
Tune Z2* (solid lines)
Tune Z2* (solid lines)
Tune
(solid lines)
Tune
Z1Z2*
(dashed
Tune Z1 (dashed lines)
Tune Z1 (dashed lines)
Divided by 300 GeV Value
0.5
2.0
2.0
5.0
< PTmax << 6.0
GeV/c
5.0
5.0< <PTmax
PTmax <6.0
6.0GeV/c
GeV/c
Divided by 300 GeV Value
Charged
Particles (|h|<0.8,
PT>0.5 GeV/c)
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.2
1.0
1.0
0.1
0.1
0.1
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
1.0
1.0
1.0
10.0
10.0
100.0
10.0
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
 Corrected CMS data at 900 GeV and 7 TeV  Corrected CMS data at 900 GeV and 7 TeV
and CDF data at 1.96 TeV, 900 GeV, and 300
and CDF data at 1.96 TeV, 900 GeV, and 300
GeV on the charged PTsum density in the
GeV on the charged particle density in the
“transAVE” region as defined by the leading
“transAVE” region as defined by the leading
charged particle (PTmax) for charged
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8
particles with pT > 0.5 GeV/c and |h| < 0.8
with 5 < PTmax < 6 GeV/c. The data are
with 5 < PTmax < 6 GeV/c. The data are
plotted versus the center-of-mass energy
plotted versus the center-of-mass energy
(log scale). The data are compared with
(log scale). The data are compared with
PYTHIA 6.4 Tune Z1 and Tune Z2*.
PYTHIA 6.4 Tune Z1 and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 48
MB versus the UE
"Transverse" Charged Particle Density: dN/dhdf
0.6
0.3
Overall density
0.0
5
10
"Transverse" Charged Density
Corrected Data
0
0.6
1.5
CDF Preliminary
"Transverse" Charged Density
0.9
"Transverse" Charged Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
CMS Preliminary
Corrected Data
1.0
1.96 TeV
0.5
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
CDF Preliminary
Corrected Data
0.4
0.2
Overall density
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
15
20
PTmax (GeV/c)
25
30
Overall density
35
900 GeV
0
7 TeV
5
10
15
20
25
GeV/c)(GeV/c)
Charged Particles (|h|<0.8, PT>0.5
PTmax
0.0
"Transverse" Charged Density
30 Density: dN/dhdf
25
20
15
10
5
0 the charged
"Transverse"
Charged
Particle
 Corrected CDF data on
particle
PTmax (GeV/c)
0.4
density, in the “transverse” region as
CDF Preliminary
defined by the leading charged particle
Corrected Data
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8. The data are corrected
0.2
to the particle level with errors that include
both the statistical error and the systematic
Overall density
300 GeV
uncertainty and are compared with the
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
overall charged particle density (straight
0.0
lines).
0
2
4
6
8
10
12
14
PTmax (GeV/c)
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 49
MB versus the UE
Overall Charged
Charged Particle
Particle Density
Density
Overall
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"Transverse"
1.0
1.0
Charged
Charged Density
Density
RDFPreliminary
Preliminary
RDF
0.50
CorrectedData
Data
Corrected
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Charged Density
Density
Charged
 Corrected CDF and CMS data on the
overall density of charged particles with pT
> 0.5 GeV/c and |h| < 0.8 for events with at
least one charged particle with pT > 0.5
GeV/c and |h| < 0.8 and on the charged
particle density, in the “transverse” region
as defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c. The data are plotted versus the
center-of-mass energy (log scale).
Fermilab "Wine & Cheese" Talk
September 27, 2013
CMS
red
squares
CMS
red
squares
CDF
blue
dots
CDF blue dots
0.6
0.6
"Transverse"
"Transverse"
55<<PTmax
PTmax<<66GeV/c
GeV/c
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Rick Field – Florida/CDF/CMS
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Particles(|h|<0.8,
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PT>0.5GeV/c)
GeV/c)
1.0
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Center-of-Mass
Center-of-MassEnergy
Energy (TeV)
(TeV)
Page 50
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RDF Preliminary
Corrected Data
7 TeV
2.0
1.5
300 GeV
1.0
"Transverse"
Charged Particle Density Ratio
Charged Particle Density
Ratio
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2.0
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Tune Z1 Generator Level
1.8
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by Overall
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"Transverse" Charged Density Ratio
2.5
"Transverse" Charged Density Ratio
"Transverse" Charged Density Ratio
"Transverse" Charged Particle"Transverse"
Density Ratio
CMS red squares
CDF blue dots
"Transverse" divided by Overall
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1.4
PYTHIA Tune Z1
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
1.2
The “transAVE”
= “transverse”
5.0 density
< PTmax <increases
6.0 GeV/c
20
25
30
35
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1.0
10.0
Charged
Particles
(|h|<0.8,
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PTmax (GeV/c) faster with center-of-mass energy
Center-of-Mass
1.2
than the overall density
(Nchg ≥ 1)!
0.1
1.0 Corrected
10.0 data on the

CDF and CMS
 Corrected CDF and CMS data on the
(TeV)
charged
particle density ratio, in the
charged particle density ratio, in the Center-of-Mass Energy
“transverse” region as defined by the
“transverse” region as defined by the
leading charged particle (PTmax) for
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
charged particles with pT > 0.5 GeV/c and
|h| < 0.8 for 5 < PTmax < 6 GeV/c. The ratio
|h| < 0.8. The ratio corresponds to the
corresponds to the “transverse” charged
“transverse” charged particle density
particle density divided by the overall
divided by the overall charged particle
charged particle density (Nchg ≥ 1). The data
density (Nchg ≥ 1).
are plotted versus the center-of-mass energy
(log scale).
0
5
10
15
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 51
“transMAX/MIN” NchgDen
"Transverse" Charged Particle Density: dN/dhdf
"Transverse"
1.2
CDF Preliminary
Preliminary
CDF
CorrectedData
Data
Corrected
Generator Level Theory
"Transverse"
"Transverse" Charged
Charged Density
Density
"Transverse" Charged Density
1.5
1.5
"Transverse" Charged Particle Density: dN/dhdf
1.96 TeV
TeV
1.96
"TransMAX"
"TransMAX"
1.0
1.0
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
0.5
"TransMIN"
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
CDF
CDFPreliminary
Preliminary
Corrected
CorrectedData
Data
Generator Level Theory
900 GeV
"TransMAX"
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.4
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
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"Transverse" Charged Particle Density: dN/dhdf
0.72
"Transverse" Charged
Charged Density
Density
"Transverse"
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX” and
“transMIN” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
12
CDF Preliminary
CDF Preliminary
300 GeV
Corrected Data
corrected data
Generator Level Theory
"TransMAX"
"TransMAX"
0.48
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.24
"TransMIN"
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
0.00
0
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"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
0.9
0.9
0.9
Corrected
CorrectedData
Data
Generator Level Theory
CDF Preliminary
"TransDIF"
Charged Particle Density
Charged Particle Density
CDF
CDF Preliminary
Preliminary
0.6
"TransAVE"
0.3
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
1.96 TeV
Corrected Data
Generator Level Theory
"TransDIF"
"TransDIF"
0.6
0.6
"TransAVE"
"TransAVE"
0.3
0.3
900
900 GeV
GeV
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
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PTmax (GeV/c)
(GeV/c)
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dhdf
0.6
Charged Particle
Particle Density
Density
Charged
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transAVE” and “transDIF”
regions as defined by the leading charged
particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |h| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
12
12
CDF Preliminary
Preliminary
CDF
CorrectedData
Data
Corrected
Generator Level Theory
"TransDIF"
0.4
"TransAVE"
0.2
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
2
Rick Field – Florida/CDF/CMS
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"TransMIN"
"TransMAX" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"TransMAX"
0.39
0.39
CDF
CDFPreliminary
Preliminary
1.96 TeV
Corrected Data
Corrected Data
Generator Level Teory
1.96 TeV
Charged
Charged Particle
Particle Density
Density
Charged Particle
Density
"TransMAX"
Charged
Density
1.2
1.2
0.8
0.8
900 900
GeVGeV
300 GeV
0.4
0.4
300 GeV
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
0.0
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CDF Preliminary
1.96 TeV
0.26
0.26
900 GeV
900 GeV
0.13
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300
GeV
Tune
Z2* (solid lines)
300 GeV
0.00
0.00
00
20
20
Tune Z1 (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
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PTmax
PTmax (GeV/c)
(GeV/c)
PTmax
"TransDIF"
"TransDIF" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
0.9
0.8
CDF
CDFPreliminary
Preliminary
Charged Particle
Particle Density
Density
Charged
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX”, “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
1.96 TeV
Corrected Data
Generator Level Theory
0.6
0.6
1.961.96
TeVTeV
Corrected
CorrectedData
Data
Generator Level Theory
900
GeV
900
GeV
0.4
300 GeV
300 GeV
0.3
0.2
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
00
Rick Field – Florida/CDF/CMS
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PTmax (GeV/c)
(GeV/c)
Page 54
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"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
1.2
1.5
Corrected
CorrectedData
Data
Generator Level Theory
1.96 TeV
1.0
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
CDF
Preliminary
CDF
Preliminary
"TransMAX"
PTsum
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum Density (GeV/c)
CDF
CDFPreliminary
Preliminary
"TransMIN"
Corrected
Data
Corrected
Data
Generator Level Theory
900 GeV
"TransMAX"
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.4
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
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"Transverse" Charged PTsum Density: dPT/dhdf
0.72
CDFPreliminary
Preliminary
CDF
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum
density in the “transMAX” and
“transMIN” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
12
PTmax (GeV/c)
PTmax (GeV/c)
300 GeV
CorrectedData
Data
Corrected
Generator Level Theory
"TransMAX"
0.48
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.24
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.00
0
2
Rick Field – Florida/CDF/CMS
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“transDIF/AVE” PTsumDen
dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged
Charged PTsum
PTsum Density:
Density: dPT/dhdf
dPT/dhdf
"Transverse"
0.9
0.9
1.2
1.2
CDF
CDFPreliminary
Preliminary
Corrected
Corrected Data
Data
Generator Level Theory
PTsum Density (GeV/c)
PTsum Density (GeV/c)
CDF Preliminary
"TransDIF"
"TransDIF"
0.8
0.8
"TransAVE"
"TransAVE"
0.4
0.4
Tune Z2* (solid lines)
1.96Z1TeV
Tune
(dashed lines)
1.96 TeV
Corrected
CorrectedData
Data
Generator Level Theory
"TransDIF"
"TransDIF"
0.6
0.6
"TransAVE"
"TransAVE"
0.3
0.3
Tune Z2* (solid lines)
900
Tune
Z1 GeV
(dashed lines)
900 GeV
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
0.0
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PTmax
PTmax (GeV/c)
(GeV/c)
PTmax
"Transverse" Charged PTsum Density: dPT/dhdf
0.6
CDF
CDFPreliminary
Preliminary
PTsum
PTsum Density
Density (GeV/c)
(GeV/c)
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum
density in the “transAVE” and “transDIF”
regions as defined by the leading charged
particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |h| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
Fermilab "Wine & Cheese" Talk
September 27, 2013
12
12
Corrected
CorrectedData
Data
Generator Level Theory
"TransDIF"
0.4
"TransAVE"
0.2
Tune Z2* (solid lines)
GeV lines)
Tune 300
Z1 (dashed
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
2
Rick Field – Florida/CDF/CMS
4
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“transMAX” NchgDen vs Ecm
"TransMAX" Charged Particle Density: dN/dhdf
"TransMAX" Charged Particle Density: dN/dhdf
0.96
CDF Preliminary
CDF Preliminary
1.96 TeV
Corrected Data
Charged Particle Density
"TransMAX" Charged Density
1.2
0.8
900 GeV
0.4
300 GeV
Corrected Data
0.64
0.32
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.00
0
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8
12
16
20
0.1
PTmax (GeV/c)
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX” region as
defined by the leading charged particle
(PTmax) for charged particles with pT >
0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors
that include both the statistical error and
the systematic uncertainty.
Fermilab "Wine & Cheese" Talk
September 27, 2013
1.0
10.0
Center-of-Mass Energy (GeV)
 Corrected CDF data on the charged particle
density in the “transMAX” region as
defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c. The data are plotted versus the
center-of-mass energy (log scale).
Rick Field – Florida/CDF/CMS
Page 57
“TransMAX/MIN” vs Ecm
"Transverse"
Charged
PTsum
Density
Ratio
"Transverse"
Charged
PTsum
Density:
dPT/dhdf
"Transverse"
Charged
Particle
Density
Ratio
"Transverse"
Charged
Particle
Density:
"Transverse"
Charged
Particle
DensitydN/dhdf
Ratio
CDF
Preliminary
CDF
CDFPreliminary
Preliminary
corrected
data
corrected
data
corrected
data
generator
level
theory
generator
level
theory
generator
level
theory
1.0
3.8
4.8
7.3
1.8
6.4
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
5.0 < PTmax < 6.0 GeV/c
5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
Tune Z2* (solid lines)
Tune
(solidlines)
lines)
Tune
Z1Z2*
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Tune Z1 (dashed lines)
0.5
2.4
2.9
"TransMIN"
"TransMAX"
"TransMIN"
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransMAX"
"TransMIN"
Divided by 300 GeV Value
Divided by 300 GeV Value
"TransMAX"
0.0
1.0
1.0
0.1
0.1
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
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Charged
1.0
1.0
10.0
10.0
100.0
Charged
PTsum
Density
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Particle
Density
Ratio
Particle
Density
Ratio
Charged
ParticleParticle
DensityDensity
Ratio
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Density
Ratio
1.5
5.2
6.7
CDF Preliminary
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CDF
CMS
solid
dots
CMS
solid
dots
CMS
solid
dots
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solid
squares
CDF
solid
squares
CDF
solid
squares
corrected data
data
corrected
generator level
level theory
theory
generator
5.2
1.2
4.6
"TransMIN"
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
< PTmax
< 6.0
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< PTmax
< 6.0
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Tune Z2*GeV/c
(solid lines)
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Z2* (solid
lines)
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Z1 (dashed
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Divided
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"TransMIN"
"TransMAX"
Tune Z1 (dashed lines)
Divided by 300 GeV Value
1.0
0.0
0.1
0.1
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
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1.0
1.0
10.0
100.0
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10.0
Center-of-Mass
Energy
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Center-of-Mass
Center-of-MassEnergy
Energy (GeV)
(GeV)
Center-of-Mass Energy (GeV)
 Corrected CDF data at 1.96 TeV, 900 GeV,
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum density
and 300 GeV on the charged particle density
in the “transMAX”, and the “transMIN”,
in the “transMAX”, and the “transMIN”,
regions as defined by the leading charged
regions as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
< 6 GeV/c. The data are plotted versus the
< 6 GeV/c. The data are plotted versus the
center-of-mass energy (log scale). The data
center-of-mass energy (log scale). The data
are compared with PYTHIA 6.4 Tune Z1
are compared with PYTHIA 6.4 Tune Z1
and Tune Z2*.
and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 58
“TransDIF/AVE” vs Ecm
"Transverse"
Charged
PTsum
Density:
dPT/dhdf
"Transverse"
Charged
PTsum
Density
Ratio
"Transverse"
"Transverse"Charged
ChargedParticle
ParticleDensity:
DensitydN/dhdf
Ratio
CDFPreliminary
Preliminary
CDF
correcteddata
data
corrected
generatorlevel
leveltheory
theory
generator
0.8
2.6
3.0
1.1
4.0
CMSCMS
solidsolid
dotsdots
CMS
solid
dots
squares
CDFCDF
solidsolid
squares
CDF
solid
squares
"TransAVE"
"TransAVE"
5.0Tune
< PTmax
< 6.0lines)
GeV/c
Z2* (solid
Tune Z2* (solid lines)
Tune
Z1
(dashed
Tune
Z1Z2*
(dashed
lines)
Tune
(solidlines)
lines)
"TransDIF"
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5 Divided by 300 GeV Value
1.8
2.0
Divided by 300 GeV Value
0.2
1.0
0.1
0.1
5.0<<PTmax
PTmax
6.0GeV/c
GeV/c
5.0
<<6.0
"TransDIF"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
1.0
1.0
1.0
10.0
10.0
10.0
100.0
Particle
Density
Ratio
Charged
PTsum
Density
(GeV/c)
Particle Particle
Density Density
Ratio
Charged
1.1
3.4
4.0
CDF Preliminary
CDF
CDF Preliminary
Preliminary
correcteddata
data
corrected
corrected data
generatorlevel
leveltheory
theory
generator
generator level theory
CMS solid dots
CMS solid dots
CDF
CDFsolid
solidsquares
squares
0.8
3.0
0.5
2.0
Tune Z2* (solid lines)
Tune
Z2* (solid
lines)
5.0
< PTmax
< 6.0
GeV/c
Tune Z1 (dashed lines)
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1by
(dashed
lines)
Divided
300 GeV
Value
"TransDIF"
"TransDIF"
"TransAVE"
5.0 << PTmax
PTmax<<"TransDIF"
6.0GeV/c
GeV/c
5.0
6.0
Divided by 300 GeV Value
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Charged Particles
(|h|<0.8, PT>0.5
GeV/c)
0.2
1.0
0.1
0.1
"TransAVE"
"TransAVE"
1.0
1.0
10.0
100.0
10.0
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass
Center-of-MassEnergy
Energy (GeV)
(GeV)
Center-of-Mass
Energy
(GeV)
Center-of-Mass
 Corrected CDF data at 1.96 TeV, 900 GeV,
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum density
and 300 GeV on the charged particle density
in the “transAVE”, and the “transDIF”,
in the “transAVE”, and the “transDIF”,
regions as defined by the leading charged
regions as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
< 6 GeV/c. The data are plotted versus the
< 6 GeV/c. The data are plotted versus the
center-of-mass energy (log scale). The data
center-of-mass energy (log scale). The data
are compared with PYTHIA 6.4 Tune Z1
are compared with PYTHIA 6.4 Tune Z1
and Tune Z2*.
and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 59
“TransMIN/DIF” vs Ecm
"Transverse" Charged PTsum Density Ratio
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density
Density Ratio
Ratio
7.3
5.8
6.7
5.2
corrected
corrected data
data
generator
generator level
level theory
theory
4.8
3.8
CMS solid dots
CDF solid squares
Tune Z2*
(solid
CMS
solidlines)
dots
Tune CDF
Z1 (dashed
lines)
solid squares
"TransMIN"
5.0
5.0 << PTmax
PTmax << 6.0
6.0 GeV/c
GeV/c
"TransMIN"
Tune Z2* (solid lines)
Tune Z1by
(dashed
lines)
Divided
300 GeV
Value
"TransDIF"
2.9
2.4
Divided by 300 GeV Value
"TransDIF"
Particle Density
Density Ratio
Ratio
Particle
Particle Density Ratio
CDF
CDF Preliminary
Preliminary
CDF Preliminary
corrected
corrected data
data
generator
generator level
level theory
theory
5.2
4.2
CMS
CMSsolid
soliddots
dots
CDF
CDFsolid
solidsquares
squares
5.0 < PTmax < 6.0 GeV/c
"TransMIN"
"TransMIN"
5.0
< Z2*
PTmax
< 6.0
GeV/c
Tune
(solid
lines)
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
3.1
2.6
Divided by 300 GeV Value
Divided by 300 GeV Value
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransDIF"
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
The
“transMIN” (MPI-BBR 1.0
component) increases
1.0
0.1
1.0
10.0
100.0
1.0
10.0
100.0
0.1
1.0
10.0
1.0
10.0
much faster with center-of-mass
energy
Center-of-Mass
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass Energy
Energy (GeV)
(GeV)
than the “transDIF” (ISR-FSR component)!
 Ratio of CDF data at 1.96 TeV, 900 GeV, and
Duh!!
 Ratio of CDF data at 1.96 TeV, 900 GeV, and
300 GeV to the value at 300 GeV for the
300 GeV to the value at 300 GeV for the
charged particle density in the “transMIN”,
charged PTsum density in the “transMIN”,
and “transDIF” regions as defined by the
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
charged particles with pT > 0.5 GeV/c and
|h| < 0.8 with 5 < PTmax < 6 GeV/c. The
|h| < 0.8 with 5 < PTmax < 6 GeV/c. The
data are plotted versus the center-of-mass
data are plotted versus the center-of-mass
energy (log scale). The data are compared
energy (log scale). The data are compared
with PYTHIA 6.4 Tune Z1 and Tune Z2*.
with PYTHIA 6.4 Tune Z1 and Tune Z2*.
1.0
1.0
0.1
0.1
The data are “normalized” by dividing by the corresponding value at 300 GeV.
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 60
“Tevatron” to the LHC
"TransAVE"
Density: dN/dhdf
dN/dhdf
"TransAVE" Charged Particle Density:
CMS
1.5
RDFPreliminary
Preliminary
RDF
13 TeV Predicted
CorrectedData
Data
Corrected
Generator
Level Theory
Tune Z2* Generator
Level
ChargedParticle
ParticleDensity
Density
Charged
7 TeV
1.0
1.0
1.96 TeV
1.96 TeV
900 GeV
CDF
0.5
0.5
CDF
900 GeV
300 GeV
300 GeV
CDF
Tune Z2*
0.0
0.0
0
0
5
5
10
10
Tune Z2* (solid lines)
Tune 4C (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
15
15
20
20
25
25
30
30
PTmax
(GeV/c)
PTmax (GeV/c)
PYTHIA 8 Tune 4C (dashed lines) - Corke & Sjöstrand
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 61
“Tevatron” to the LHC
"TransAVE" Charged
"Transverse"
ChargedPTsum
PTsumDensity:
Density:dPT/dhdf
dPT/dhdf
1.8
1.8
RDF
RDFPreliminary
Preliminary
PTsum Density
Density (GeV/c)
PTsum
(GeV/c)
Corrected
Data
Corrected
Data
Generator
Level Theory
Tune Z2* Generator
Level
CMS
13
13 TeV
TeV Predicted
Predicted
77 TeV
TeV
1.2
1.2
CDF
1.96 TeV
TeV
1.96
0.6
0.6
900 GeV
GeV
900
300 GeV
GeV
300
Tune Z2*
0.0
0.0
00
55
10
10
CDF
Tune Z2* (solid lines)
CDF
Tune 4C (dashed lines)
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
15
15
20
20
25
25
30
30
PTmax (GeV/c)
(GeV/c)
PTmax
PYTHIA 8 Tune 4C (dashed lines) - Corke & Sjöstrand
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 62
Summary & Conclusions
 The “transverse” density increases faster with center-of-mass energy
than the overall density (Nchg ≥ 1)! However, the “transverse” =
“transAVE” region is not a true measure of the energy dependence of
MPI since it receives large contributions from ISR and FSR.
What wecomponent)
are learning
should
 The “transMIN” (MPI-BBR
increases
much faster with
I would like to thank the CDF-SM
allow
forthan
a deeper
understanding
ofcomponent)!
MPI
center-of-mass
energy
the “transDIF”
(ISR-FSR
conveners,
Christina Mesropian,
Previously we only
knew will
the energy
of “transAVE”.
which
resultdependence
in more precise
Bo Jayatilaka, and Larry Nodulman
predictions
atMB
the future
We for
nowtheir
havehelp
at lot
of
& UE data at
and encouragement!
energy
13 TeV!
300 GeV, LHC
900 GeV,
1.96ofTeV,
and 7 TeV!
We can study the energy dependence
more precisely than ever before!
 Both PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4 Tune Z2*
(CTEQ6L) go a fairly good job (although not perfect) in describing the
energy deperdence of the UE!
Fermilab "Wine & Cheese" Talk
September 27, 2013
Rick Field – Florida/CDF/CMS
Page 63