HEP Seminar
Tevatron Energy Scan:
Findings & Surprises
Rick Field
University of Florida
Outline of Talk
Outgoing Parton
 CDF data from the Tevatron Energy Scan.
 The overall event topology for events with
PT(hard)
Initial-State Radiation
Proton
AntiProton
Underlying Event
Underlying Event
at least 1 charged particle.
 The “transMAX”, “transMIN”, “transAVE”
Outgoing Parton
Final-State
Radiation
and “transDIF” UE observables.
 Mapping out the energy dependence:
Tevatron to the LHC!
 Comparisions with PYTHIA 6.4 Tune
Z1 & Z2* and PYTHIA 8 Tune 4C*.
 Summary & Conclusions.
HEP Seminar - Baylor
Waco, January 21, 2014
CDF Run 2
300 GeV, 900 GeV, 1.96 TeV
Rick Field – Florida/CDF/CMS
CMS at the LHC
900 GeV, 7 & 8 TeV
Page 1
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!
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 2
Proton-Proton Collisions
Elastic Scattering
Single Diffraction
Double Diffraction
M2
M
M1
stot = sEL + sSD
IN +sDD +sHC
ND
“Inelastic Non-Diffractive Component”
Hard Core
The “hard core” component
contains both “hard” and
“soft” collisions.
“Hard” Hard Core (hard scattering)
Outgoing Parton
“Soft” Hard Core (no hard scattering)
Proton
PT(hard)
Proton
Proton
Proton
Underlying Event
Underlying Event
Initial-State
Radiation
Final-State
Radiation
Outgoing Parton
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 3
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
+…
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Multiple-parton
interactions (MPI)!
Page 4
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”.
HEP Seminar - Baylor
Waco, January 21, 2014
Proton
+
+
Proton
Proton
Rick Field – Florida/CDF/CMS
“Semi-hard” partonparton collision
(pT < ≈2 GeV/c)
Proton
Proton
+…
Multiple-parton
interactions (MPI)!
Page 5
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
+…
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Multiple-parton
interactions (MPI)!
Page 6
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
All of Rick’s tunes (except X2):
1/(pT)4→ 1/(pT2+pT02)2
A, AW, AWT,DW, DWT,
D6, D6T, CW, X1,
“Min-Bias”
“Min-Bias” (add
(ND)single & double diffraction)
and Tune Z1,
are UE tunes!
Proton
Predict MB (ND)!
Proton
+
+
Proton
Proton
Proton
Single Diffraction
Predict MB (IN)!
HEP Seminar - Baylor
Waco, January 21, 2014
+…
Proton
+
Proton
Proton
Double Diffraction
M2
M
Rick Field – Florida/CDF/CMS
M1
Page 7
MB Tunes
“Underlying Event”
Predict the “underlying
event” in a hard
scattering process!
Proton
Proton
Most of Peter Skand’s tunes:
S320 Perugia
0, S325 Perugia X,
“Min-Bias”
(ND)
S326 Perugia 6
are MB tunes!
Proton
Fit MB (ND).
Proton
+
Proton
+
Proton
Proton
Proton
+
Proton
Proton
+…
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
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
HEP Seminar - Baylor
Waco, January 21, 2014
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.
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”.
 All three regions have the same area in h-f space, Dh×Df = 2hcut×120o = 2hcut×2/3. Construct
densities by dividing by the area in h-f space.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 10
Tevatron Energy Scan
Proton
CDF
1 mile
AntiProton
Proton
900GeV
GeV
300
1.96
TeV
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
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 11
Jet Observables
 “Toward” Charged Particle Density: Number of charged particles
(pT > 0.5 GeV/c, |h| < 0.8) in the “toward” region (not including
PTmax) 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.
 “Toward” Charged PTsum Density: Scalar pT sum of the charged
particles (pT > 0.5 GeV/c, |h| < 0.8) in the “toward” region (not
including PTmax) 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”
 “Away” Charged Particle Density: Number of charged particles (pT > 0.5
GeV/c, |h| < 0.8) in the “away” 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.
 “Away” Charged PTsum Density: Scalar pT sum of the charged particles (pT >
0.5 GeV/c, |h| < 0.8) in the “away” 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.
hcut = 0.8
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 12
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.
hcut = 0.8
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 13
Observables
PTmax Direction
 Total Number of Charged Particles: Number of charged particles (pT >
Df
0.5 GeV/c, |h| < 0.8, including PTmax) as defined by the leading charged
particle, PTmax, with at least one particle with pT > 0.5 GeV/c, |h| < hcut.
 Overall “Associated” Charged Particle Density: Number of charged
particles (pT > 0.5 GeV/c, |h| < 0.8, not including PTmax) as defined
by the leading charged particle, PTmax, divided by the area in h-f
space, 2hcut×2, averaged over all events with at least one particle
with pT > 0.5 GeV/c, |h| < hcut.
 Overall “Associated” Charged PTsum Density: Scalar pT sum of
the charged particles (pT > 0.5 GeV/c, |h| < 0.8, not including
PTmax) as defined by the leading charged particle, PTmax, divided
by the area in h-f space, 2hcut×2, averaged over all events with at
least one particle with pT > 0.5 GeV/c, |h| < hcut.
“Toward”
“Transverse”
“Transverse”
“Away”
hcut = 0.8
Note: The overall “associated” density is equal to the average of the “Towards”,
“Away”, and “Transverse” densities.
Overall “Associated” Density = (“Towards” Density + “Away” Density + “Transverse” Density)/3
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 14
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”
Overall “Transverse” = “transMAX” + “transMIN”
“TransMIN”
“Away”
hcut = 0.8
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
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 15
“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.
Jet #3
“transDIF”) is very sensitive to initial-state radiation (ISR) 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”
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 16
PTmax UE Data
 CDF PTmax UE Analysis: “Towards”, “Away”, “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).
PTmax Direction
Df
“Toward”
“TransMAX”
 CMS PTmax UE Analysis: “Towards”, “Away”, “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 (Mohammed Zakaria Ph.D. Thesis,
CMS PAS FSQ-12-020).
“TransMIN”
“Away”
 CMS UE Tunes: PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4
Tune Z2* (CTEQ6L) and PYTHIA 8 Tune 4C* (CTEQ6L). All 3
were tuned to the CMS leading chgjet “transAVE” UE data at 900
GeV and 7 TeV.
Similar to Tune 4C by
Corke and Sjöstrand!
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 17
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
HEP Seminar - Baylor
Waco, January 21, 2014
Proton
Proton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 18
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 19
MB Common Plots 7 TeV
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 20
CDF Common Plots
Observable
300 GeV
900 GeV
1.96 TeV
Done
Done
Done
MB2: dNchg/dpT Nchg ≥ 1 |h| < 0.8
In progress
In progress
In progress
MB3: Multiplicity Distribution
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
In progress
In progress
In progress
MB4: <pT> versus Nchg
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
In progress
In progress
In progress
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
MB1: dNchg/dh Nchg ≥ 1
|h| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 21
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 22
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
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
900 GeV
7 TeV
1.96 TeV
-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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 23
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 24
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 25
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.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 26
Total Number of Charged Particles
<Nchg> = 4.8!
Number of Charged Particles
Pseudo-Rapidity Distribution: dN/dh
4
5
RDF Preliminary
Corrected Data
3
1.96 TeV
2
900 GeV
300 GeV
1
Average Number
Average Number
RDF Preliminary
7 TeV
Corrected Data
CMS red squares
CDF blue dots
4
3
At least 1 charged particle
At least 1 charged particle
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
0.1
Pseudo-Rapidity
1.0
10.0
Center-of-Mass Energy (TeV)
 CDF and CMS data on the pseudo-rapidity
 CDF and CMS data total number of charged
distribution, dN/dh, for charged with pT > 0.5
particles with pT > 0.5 GeV/c and |h| < 0.8 for
GeV/c and |h| < 0.8 for events with at least one
events with at least one charged particle with pT >
charged particle with pT > 0.5 GeV/c and |h| <
0.5 GeV/c and |h| < 0.8 plotted versus the center0.8.
of-mass energy (log scale). The data are corrected
to the particle level with errors that include both
Ecm
Nchg
error
NchgDen
error
the statistical error and the systematic
300 GeV
2.241
0.175
0.223
0.017
uncertainty.
900 GeV
3.012
0.203
0.300
0.020
1.96 TeV
3.439
0.186
0.342
0.019
7 TeV
4.782
0.063
0.476
0.006
HEP Seminar - Baylor
Waco, January 21, 2014
0.8
N chg 
dN
0.8 dh dh
Rick Field – Florida/CDF/CMS
Page 27
Total Number of Charged Particles
Factor of 2.1
Number
Number of
of Charged
Charged Particles
Particles
Number
Particles
Numberof
ofCharged
Charged
Particles
increase!
55
2.2
2.2
CMS
CMS red
red squares
squares
CDF
CDF blue
blue dots
dots
Corrected
Data
Corrected
Data
Generator Level Theory
RDF
Preliminary
RDF
Preliminary
Corrected
Data
Corrected
Data
Generator Level Theory
44
CMS
CMSred
redsquares
squares
CDF
CDFblue
bluedots
dots
1.8
1.8
Ratio
Ratio
Average Number
Number
Average
RDF
RDFPreliminary
Preliminary
Tune Z1
33
Divided
Dividedby
by300
300GeV
GeVValue
Value
Tune Z1
1.4
1.4
At
Atleast
least11charged
chargedparticle
particle
At
At least
least 11 charged
charged particle
particle
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
22
0.1
0.1
1.0
1.0
10.0
10.0
1.0
1.0
0.1
0.1
Center-of-Mass
Center-of-Mass Energy
Energy (TeV)
(TeV)
1.0
1.0
10.0
10.0
Center-of-Mass
Center-of-MassEnergy
Energy (TeV)
(TeV)
 CDF and CMS data total number of charged  CDF and CMS data ratio of the total number of
particles with pT > 0.5 GeV/c and |h| < 0.8 for
charged particles with pT > 0.5 GeV/c and |h| <
events with at least one charged particle with pT >0.8 for events with at least one charged particle
0.5 GeV/c and |h| < 0.8 plotted versus the center- with pT > 0.5 GeV/c and |h| < 0.8 plotted versus
of-mass energy (log scale). The data are corrected the center-of-mass energy (log scale). The data
to the particle level with errors that include both are divided by the value at 300 GeV.
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4 Tune Z1
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 28
Total Number of Charged Particles
Total Number of Charged Particles
12
12
1.9620
TeV
Corrected Data
CDF Preliminary
CMS Preliminary
9
Average Number
Corrected Data
6
3
0
0
900 GeV
Corrected Data
7 TeV
9
Average Number
CDF Preliminary
Average Number
Total Number of Charged Particles
Total Number of Charged Particles
15
<NchgTOT> = 3.44
10
6
<NchgTOT> = 3.01
3
<NchgTOT> = 4.78
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0
5
5
10
15
20
PTmax (GeV/c)
0
5
10
15
20
PTmax
Charged Particles (|h|<0.8, PT>0.5
GeV/c)(GeV/c)
0
0
5
10
20 Total Number
25 of Charged
30 Particles
15
Average Number
 CDF data at 1.96 TeV, 900 GeV, and 300
PTmax
GeV on the total number of charged
particles (including PTmax) 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.
8
(GeV/c)
CDF Preliminary
300 GeV
Corrected Data
6
4
<NchgTOT> = 2.24
2
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0
0
2
4
6
8
10
12
PTmax (GeV/c)
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 29
14
Total Number of Charged Particles
Total Number of Charged Particles
Total Number of Charged Particles
20
20
RDF Preliminary
Corrected Data
Generator Level Theory
Average Number
Average Number
Corrected Data
15
1.96 TeV
10
900 GeV
300 GeV
5
7 TeV
RDF Preliminary
7 TeV
15
1.96 TeV
10
900 GeV
5
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0
0
0
5
10
15
20
25
0
30
5
10
15
20
25
30
PTmax (GeV/c)
PTmax (GeV/c)
Total Number of Charged Particles
20
7 TeV
RDF Preliminary
Average Number
 CMS and CDF data on the total number of
charged particles (including PTmax) 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.
Corrected Data
Generator Level Theory
15
1.96 TeV
10
900 GeV
5
Tune Z2* (solid lines)
Tune 4C*(dashed lines)
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0
0
5
10
15
20
25
PTmax (GeV/c)
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 30
30
“Associated” Charged Particle Density
Associated Charged
"Associated"
ChargedParticle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
Associated Charged
"Associated"
ChargedParticle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
1.5
1.5
CDFPreliminary
Preliminary
CDF
corrected data
Corrected Data
Tune Z1 generator level
CDF Preliminary
CDF Preliminary
"Toward"
"Toward"
1.0
1.0
Charged Particle Density
Charged
Charged Particle
Particle Density
Density
1.5
1.5
"Away"
"Away"
"Transverse"
"Transverse"
0.5
0.5
1.96
1.96TeV
TeV
900 GeV
corrected data
Corrected Data
Tune Z1 generator level
1.0
1.0
"Toward"
"Toward"
"Away"
"Away"
"Transverse"
"Transverse"
0.5
0.5
900 GeV
Charged
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
0.0
0.0
00
44
88
12
12
16
16
00
20
20
44
88
16
16
20
20
PTmax
PTmax (GeV/c)
(GeV/c)
PTmax (GeV/c)
(GeV/c)
PTmax
"Associated"
ChargedParticle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
Associated Charged
1.2
1.2
CDF Preliminary
Preliminary
CDF
Charged
Charged Particle
Particle Density
Density
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the “associated” charged
particle density in the “toward”, “away”,
and “transverse” 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
Tune Z1.
HEP Seminar - Baylor
Waco, January 21, 2014
12
12
300 GeV
GeV
300
corrected Data
data
Corrected
Tune Z1 generator level
0.8
0.8
"Away"
"Away"
"Toward"
"Toward"
0.4
0.4
"Transverse"
"Transverse"
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
00
22
Rick Field – Florida/CDF/CMS
44
66
88
10
10
12
12
PTmax (GeV/c)
(GeV/c)
PTmax
Page 31
14
14
“Toward” Associated Density
300 GeV
“Away” Parton
“Toward” Parton
“PTmax” Particle
“Associated”
Toward Particles
“Away” Particles
 At low center-of-mass energies PTmax carries almost all the momentum of the
“toward” parton (i.e. z ≈ 1) leaving very little momentum for the other particles in
the “jet”.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 32
“Toward” Associated Density
1.96 TeV
“Away” Parton
“Toward” Parton
“PTmax” Particle
“Associated”
Toward Particles
“Away” Particles
 At higher center-of-mass energies the same PTmax carries less of the momentum of
the “toward” parton (i.e. z < 1) leaving more momentum for the other particles in
the “jet”.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 33
“Transverse” Charge Particle Fraction
"Transverse" Fraction of Charged Particles
"Transverse" Fraction of Charged Particles
0.35
0.35
RDF Preliminary
Corrected Data
7 TeV
Average Fraction
Average Fraction
RDF Preliminary
Transverse/Total
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Transverse/Total
Corrected Data
Generator Level Theory
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
7 TeV
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.05
0.05
0
5
10
15
20
25
30
0
5
10
PTmax (GeV/c)
15
20
25
PTmax (GeV/c)
"Transverse" Fraction of Charged Particles
0.35
Average Fraction
 CMS and CDF data on the fraction of
charged particle 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. The plot shows the
“transverse” Nchg divided by the total Nchg.
The data are corrected to the particle level
with errors that include both the statistical
error and the systematic uncertainty.
RDF Preliminary
Transverse/Total
Corrected Data
Generator Level Theory
Tune Z2* (solid lines)
Tune 4C* (dashed lines)
7 TeV
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.05
0
5
10
15
20
25
PTmax (GeV/c)
HEP Seminar - Baylor
Waco, January 21, 2014
30
Rick Field – Florida/CDF/CMS
Page 34
30
“Associated” Charged Particle Density
"Away" Charged
Charged Particle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
"Away"
"Toward" Charged Particle Density: dN/dhdf
1.5
1.5
1.5
1.5
correctedData
data
Corrected
Tune Z1 generator level
1.96 TeV
1.96 TeV
1.0
1.0
"Away"
"Away" Charged
Charged Density
Density
"Toward" Charged
Charged Density
Density
"Toward"
CDFPreliminary
Preliminary
CDF
900 GeV
900 GeV
300 GeV
0.5
0.5
300 GeV
CDFPreliminary
Preliminary
CDF
corrected data
Corrected Data
Tune Z1 generator level
1.96 TeV
1.96 TeV
1.0
1.0
900 GeV
GeV
900
300 GeV
GeV
300
0.5
0.5
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
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)
0.0
0.0
0.0
00
44
88
12
12
16
16
0
20
20
4
12
12
16
16
20
20
(GeV/c)
PTmax (GeV/c)
PTmax
PTmax (GeV/c)
(GeV/c)
"Transverse" Charged Particle Density: dN/dhdf
0.9
Charged Particle
Particle Density
Density
Charged
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the “associated” charged
particle density in the “toward”, “away”,
and “transverse” 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
Tune Z1.
HEP Seminar - Baylor
Waco, January 21, 2014
8
CDF Preliminary
CDF Preliminary
corrected data
Corrected Data
Tune Z1 generator level
1.96 TeV
0.6
1.96 TeV
900 GeV
900 GeV
0.3
300 GeV
300 GeV
Charged
Particles
(|h|<0.8,
PT>0.5
GeV/c)
Charged
Particles
(|h|<0.8,
PT>0.5
GeV/c)
0.0
0
Rick Field – Florida/CDF/CMS
4
88
12
12
16
16
PTmax (GeV/c)
Page 35
20
20
“Associated” Charged PTsum Density
"Away" Charged PTsum Density: dPT/dhdf
"Toward" Charged PTsum Density: dPT/dhdf
2.4
2.4
CDF
CDFPreliminary
Preliminary
1.96 TeV
Corrected
correctedData
data
Tune Z1 generator level
1.8
1.8
1.96 TeV
GeV
900900
GeV
300 GeV
300 GeV
0.9
0.9
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
"Away" PTsum Density (GeV/c)
"Toward"
"Toward" PTsum
PTsum Density
Density (GeV/c)
(GeV/c)
2.7
2.7
CDF
CDFPreliminary
Preliminary
Corrected
correctedData
data
Tune Z1 generator level
1.96 TeV
900 GeV
900 GeV
1.6
1.6
300 GeV
1.96 TeV
300 GeV
0.8
0.8
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
0.0
0.0
0.0
0.0
00
44
88
12
12
16
16
00
20
20
44
12
12
16
16
20
20
PTmax (GeV/c)
(GeV/c)
PTmax
PTmax (GeV/c)
(GeV/c)
PTmax
"Transverse"
"Transverse" Charged
Charged PTsum
PTsum Density:
Density: dPT/dhdf
dPT/dhdf
0.9
PTsum
Density
(GeV/c)
Charged
PTsum
Density
(GeV/c)
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the “associated” charged
PTsum density in the “toward”, “away”,
and “transverse” 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
Tune Z1.
HEP Seminar - Baylor
Waco, January 21, 2014
88
CDF
CDF Preliminary
Preliminary
Corrected
corrected Data
data
Tune Z1 generator level
1.96 TeV
1.96 TeV
900 GeV
0.6
900 GeV
300 GeV
0.3
300 GeV
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
0.0
0
Rick Field – Florida/CDF/CMS
4
8
12
16
PTmax (GeV/c)
Page 36
20
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)
HEP Seminar - Baylor
Waco, January 21, 2014
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 37
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
20
20
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 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.
systematic uncertainty.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 38
“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 at  Corrected CMS data at 7 TeV and CDF data at
1.96 TeV, 900 GeV, and 300 GeV on the
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 pT
particle (PTmax) for charged particles with pT
> 0.5 GeV/c and |h| < 0.8. The data are
> 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 compared
systematic uncertainty. The data are compared
with PYTHIA Tune Z1 and Tune Z2*.
with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 39
“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
and CDF data at 1.96 TeV, 900 GeV, and 300
GeV on the charged particle density in the
“transAVE” 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). The data are compared with PYTHIA
6.4 Tune Z1 and Tune Z2*.
 Corrected CMS data at 900 GeV and 7 TeV
and CDF data at 1.96 TeV, 900 GeV, and 300
GeV on the charged PTsum density in the
“transAVE” 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). The data are compared with PYTHIA
6.4 Tune Z1 and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 40
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
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"Transverse"
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Particle
 Corrected CDF data on0 the charged
particle
PTmax (GeV/c)
0.4
density, in the “transverse” region as defined
CDF Preliminary
by the leading charged particle (PTmax) for
Corrected Data
charged particles with pT > 0.5 GeV/c and |h|
< 0.8. The data are corrected to the particle
0.2
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)
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 41
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
Tune Z1 Generator Level
CMS red
red squares
squares
CMS
CDF blue
blue dots
dots
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0.40
0.40
PYTHIA Tune Z1
0.30
0.30
At least
least 11 charged
charged particle
particle
At
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
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0.20
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0.1
0.1
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1.0
"Transverse"
"Transverse" Charged
Charged Density
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0.60
0.50
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0.8
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0.4
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5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
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PT>0.5GeV/c)
GeV/c)
Charged
0.2
0.2
0.1
0.1
10.0
10.0
1.0
1.0
10.0
10.0
Center-of-Mass Energy
Energy (TeV)
(TeV)
Center-of-Mass
Center-of-Mass Energy
Energy (TeV)
(TeV)
Center-of-Mass
Charged
Charged Particle
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0.8
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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).
HEP Seminar - Baylor
Waco, January 21, 2014
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
CMS
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squares
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dots
0.4
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0.2
0.2
At
Atleast
least11charged
chargedparticle
particle
Overall
Overall
0.0
0.0
0.1
0.1
Rick Field – Florida/CDF/CMS
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
1.0
1.0
10.0
10.0
Center-of-Mass
Center-of-MassEnergy
Energy (TeV)
(TeV)
Page 42
“Transverse”/Overall
RDF Preliminary
Corrected Data
7 TeV
2.0
1.5
300 GeV
1.0
"Transverse"
Charged Particle Density Ratio
Charged Particle Density
Ratio
Amazing!
RDF Preliminary
2.0
1.8
Corrected Data
Tune Z1 Generator Level
900 GeV
"Transverse" divided by overall
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
1.4
2.0
RDF Preliminary
CMS red squares Corrected Data
CDF blue1.8
dots
"Transverse"
by Overall
1.96divided
TeV
1.6
"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
1.6
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”
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< PTmax <increases
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20
25
30
35
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Particles
(|h|<0.8,
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Center-of-Mass
1.2
than the overall density
(Nchg ≥ 1)!
0.1
1.0Corrected

CDF and CMS10.0
data on the
 Corrected CDF and CMS data on the
Center-of-Mass charged
Energy (TeV)
particle density ratio, in the
charged particle density ratio, in the
“transverse” region as defined by the leading
“transverse” 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 for
particles with pT > 0.5 GeV/c and |h| < 0.8.
5 < PTmax < 6 GeV/c. The ratio corresponds
The ratio corresponds to the “transverse”
to the “transverse” charged particle density
charged particle density divided by the
divided by the overall charged particle
overall charged particle density (Nchg ≥ 1).
density (Nchg ≥ 1). The data are plotted versus
the center-of-mass energy (log scale).
0
5
10
HEP Seminar - Baylor
Waco, January 21, 2014
15
Rick Field – Florida/CDF/CMS
Page 43
“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)
0.0
00
44
88
12
12
16
16
20
20
0
4
8
PTmax (GeV/c)
(GeV/c)
PTmax
12
20
PTmax (GeV/c)
"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.
CDF Preliminary
CDF Preliminary
300 GeV
Corrected Data
corrected data
Generator Level Theory
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
"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
HEP Seminar - Baylor
Waco, January 21, 2014
16
0
Rick Field – Florida/CDF/CMS
2
4
6
8
10
12
PTmax (GeV/c)
Page 44
14
“tranMIN” Nchg Fraction
"Transverse" Fraction of Charged Particles
"Transverse" Fraction of Charged Particles
0.35
0.35
RDF Preliminary
Average Fraction
Corrected Data
Average Fraction
RDF Preliminary
Transverse/Total
7 TeV
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Transverse/Total
Corrected Data
Generator Level Theory
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
7 TeV
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.05
0.05
0
5
10
15
20
25
30
0
5
10
PTmax (GeV/c)
20
25
30
PTmax (GeV/c)
"Transverse" Fraction of Charged Particles
0.35
Average Fraction
 CMS and CDF data on the fraction of
charged particles in the “transMIN” region
as defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8. The plot shows
“transMIN” Nchg divided by the overall
“transverse” Nchg. The data are corrected
to the particle level with errors that include
both the statistical error and the systematic
uncertainty.
HEP Seminar - Baylor
Waco, January 21, 2014
15
RDF Preliminary
Transverse/Total
Corrected Data
Generator Level Theory
Tune Z2* (solid lines)
Tune 4C* (dashed lines)
7 TeV
0.25
1.96 TeV
0.15
900 GeV
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.05
0
Rick Field – Florida/CDF/CMS
5
10
15
20
25
PTmax (GeV/c)
Page 45
30
“transMAX/MIN” NchgDen
"TransMAX" Charged Particle Density: dN/dhdf
"TransMIN" Charged Particle Density: dN/dhdf
0.66
2.1
Corrected Data
Generator Level Theory
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
7 TeV
Charged Particle Density
Charged Particle Density
RDF Preliminary
1.4
1.96 TeV
900 GeV
0.7
300 GeV
RDF Preliminary
7 TeV
Corrected Data
Generator Level Theory
0.44
1.96 TeV
900 GeV
0.22
Tune Z2* (solid lines)
300 GeV Tune Z1 (dashed lines)
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
5
10
15
20
25
30
0
PTmax (GeV/c)
5
10
15
20
25
30
PTmax (GeV/c)
 Corrected CMS data at 7 TeV and CDF data at  Corrected CMS data at 7 TeV and CDF data at
1.96 TeV, 900 GeV, and 300 GeV on the
1.96 TeV, 900 GeV, and 300 GeV on the
charged particle density in the “transMAX”
charged particle density in the “transMIN”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with pT
particle (PTmax) for charged particles with pT
> 0.5 GeV/c and |h| < 0.8. The data are
> 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 compared
systematic uncertainty. The data are compared
with PYTHIA Tune Z1 and Tune Z2*.
with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 46
“transDIF/AVE” NchgDen
"TransDIF" Charged Particle Density: dN/dhdf
"TransAVE" Charged Particle Density: dN/dhdf
RDF Preliminary
Corrected Data
Generator Level Theory
1.5
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
RDF Preliminary
Charged Particle Density
Charged Particle Density
1.5
7 TeV
1.0
1.96 TeV
900 GeV
0.5
300 GeV
Corrected Data
Generator Level Theory
7 TeV
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 at  Corrected CMS data at 7 TeV and CDF data at
1.96 TeV, 900 GeV, and 300 GeV on the
1.96 TeV, 900 GeV, and 300 GeV on the
charged particle density in the “transDIF”
charged particle density in the “transAVE”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with pT
particle (PTmax) for charged particles with pT
> 0.5 GeV/c and |h| < 0.8. The data are
> 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 compared
systematic uncertainty. The data are compared
with PYTHIA Tune Z1 and Tune Z2*.
with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 47
“transMAX” NchgDen vs Ecm
"TransMAX" Charged Particle Density: dN/dhdf
"TransMAX" Charged Particle Density: dN/dhdf
2.1
1.5
Corrected Data
7 TeV
Charged Particle Density
Charged Particle Density
RDF Preliminary
1.4
1.96 TeV
900 GeV
0.7
300 GeV
RDF Preliminary
Corrected Data
1.0
5.0 < PTmax < 6.0 GeV/c
0.5
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
5
10
15
20
25
30
0.1
PTmax (GeV/c)
1.0
10.0
Center-of-Mass Energy (GeV)
 Corrected CMS data at 7 TeV and CDF data  Corrected CMS and CDF data on the
at 1.96 TeV, 900 GeV, and 300 GeV on the
charged particle density in the “transMAX”
charged particle density in the “transMAX”
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 with 5 < PTmax
pT > 0.5 GeV/c and |h| < 0.8. The data are
< 6 GeV/c. The data are plotted versus the
corrected to the particle level with errors
center-of-mass energy (log scale).
that include both the statistical error and
the systematic uncertainty.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 48
“Transverse” NchgDen vs Ecm
<transMIN> = 4.7
"Transverse" Charged Particle Density Ratio
"Transverse" Charged Particle Density: dN/dhdf
5.2
1.5
corrected data
generator level theory
RDF Preliminary
CMS solid dots
CDF solid squares
"TransMAX"
1.0
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
"TransMIN"
Particle Density Ratio
Charged Particle Density
RDF Preliminary
corrected data
generator level theory
CMS solid dots
CDF solid squares
<transMAX> = 2.7
3.8
5.0 < PTmax < 6.0 GeV/c
"TransMIN"
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
2.4
Divided by 300 GeV Value
"TransMAX"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.1
1.0
1.0
10.0
0.1
1.0
10.0
Center-of-Mass Energy (GeV)
Center-of-Mass Energy (GeV)
 Corrected CMS data at 7 TeV and CDF data  Ratio of CMS data at 7 TeV and CDF data at
at 1.96 TeV, 900 GeV, and 300 GeV on the
1.96 TeV, 900 GeV, and 300 GeV to the value
charged particle density in the “transMAX”
at 300 GeV for the charged particle density in
and “transMIN” regions as defined by the
the “transMAX” and “transMIN” regions as
leading charged particle (PTmax) for
defined by the leading charged particle
charged particles with pT > 0.5 GeV/c and |h|
(PTmax) for charged particles with pT > 0.5
< 0.8 with 5 < PTmax < 6 GeV/c. The data are
GeV/c and |h| < 0.8 with 5 < PTmax < 6
plotted versus the center-of-mass energy (log
GeV/c. The data are plotted versus the
scale).
center-of-mass energy (log scale).
The data are compared with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 49
“Transverse” NchgDen vs Ecm
<transAVE> = 3.1
"Transverse" Charged Particle Density Ratio
"Transverse" Charged Particle Density: dN/dhdf
1.1
3.4
RDF Preliminary
CMS solid dots
CDF solid squares
corrected data
generator level theory
Particle Density Ratio
Charged Particle Density
RDF Preliminary
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5
5.0 < PTmax < 6.0 GeV/c
corrected data
generator level theory
2.6
"TransAVE"
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
1.8
Divided by 300 GeV Value
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.2
CMS solid dots
<transDIF>
= 2.2
CDF solid squares
"TransDIF"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
1.0
0.1
1.0
10.0
0.1
Center-of-Mass Energy (GeV)
1.0
10.0
Center-of-Mass Energy (GeV)
 Corrected CMS data at 7 TeV and CDF data  Ratio of CMS data at 7 TeV and CDF data at
at 1.96 TeV, 900 GeV, and 300 GeV on the
1.96 TeV, 900 GeV, and 300 GeV to the value
charged particle density in the “transAVE”
at 300 GeV for the charged particle density in
and “transDIF” regions as defined by the
the “transAVE” and “transDIF” regions as
leading charged particle (PTmax) for
defined by the leading charged particle
charged particles with pT > 0.5 GeV/c and |h|
(PTmax) for charged particles with pT > 0.5
< 0.8 with 5 < PTmax < 6 GeV/c. The data are
GeV/c and |h| < 0.8 with 5 < PTmax < 6
plotted versus the center-of-mass energy (log
GeV/c. The data are plotted versus the
scale).
center-of-mass energy (log scale).
The data are compared with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 50
“TransMIN/DIF” vs Ecm
<transMIN> = 5.7
<transMIN> = 4.7
"Transverse" Charged Particle Density Ratio
"Transverse" Charged PTsum Density Ratio
5.2
5.8
RDF Preliminary
CMS solid dots
CDF solid squares
corrected data
generator level theory
<transDIF> = 2.2
3.8
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransMIN"
"TransDIF"
2.4
Divided by 300 GeV Value
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Particle Density Ratio
Particle Density Ratio
RDF Preliminary
corrected data
generator level theory
CMS solid dots
CDF solid squares
<transDIF> = 2.6
4.2
"TransMIN"
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
2.6
"TransDIF"
Divided by 300 GeV Value
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
The
“transMIN” (MPI-BBR
component)
increases 1.0
1.0
10.0
0.1
10.0
much
Center-of-Mass Energy
(GeV)faster with center-of-mass energy
Center-of-Mass Energy (GeV)
than the “transDIF” (ISR-FSR component)!
 Ratio of CMS data at 7 TeV and CDF data atDuh!!
 Ratio of CMS data at 7 TeV and CDF data at
1.96 TeV, 900 GeV, and 300 GeV to the value
1.96 TeV, 900 GeV, and 300 GeV to the value
at 300 GeV for the charged particle density in
at 300 GeV for the charged PTsum density in
the “transMIN”, and “transDIF” regions as
the “transMIN”, and “transDIF” regions as
defined by the leading charged particle
defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c. The data are plotted versus the
GeV/c. The data are plotted versus the
center-of-mass energy (log scale).
center-of-mass energy (log scale).
1.0
1.0
0.1
The data are compared with PYTHIA Tune Z1 and Tune Z2*.
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 51
“Tevatron” to the LHC
"TransAVE" Charged Particle Density: dN/dhdf
CMS
1.5
RDF Preliminary
13 TeV Predicted
Corrected Data
Generator Level Theory
Charged Particle Density
7 TeV
1.0
CDF
1.96 TeV
0.5
CDF
900 GeV
300 GeV
CDF
Tune Z2* & 4C*
0.0
0
5
10
Tune Z2* (solid lines)
Tune 4C* (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
15
20
25
30
PTmax (GeV/c)
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 52
“Tevatron” to the LHC
"TransAVE" Charged PTsum Density: dPT/dhdf
CMS
1.8
RDF Preliminary
13 TeV Predicted
PTsum Density (GeV/c)
Corrected Data
Generator Level Theory
7 TeV
1.2
CDF
1.96 TeV
0.6
900 GeV
300 GeV
Tune Z2* & 4C*
0.0
0
5
10
CDF
Tune Z2* (solid lines)
Tune 4C* (dashed lines)
CDF
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
15
20
25
30
PTmax (GeV/c)
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 53
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.
The “transMIN” (MPI-BBR
component)
increases
much faster with centerWhat we
are learning
should
of-mass energy
than for
the “transDIF”
(ISR-FSR component)!
allow
a deeper understanding
of MPIPreviously we
only knew the energy dependence of “transAVE”.
which will result in more precise
PYTHIA 6.4 Tune Z1 &
Z2* and PYTHIA
Tune 4C* do a fairly good job
predictions
at the8 future
in describing the energy
however
is room for
LHCdeperdence
energies of
ofthe
13 UE,
& 14
TeV! there
e
improvement! The parameterization PT0(Ecm) = PT0(Ecm/E0) seems to work!
We now have at lot of MB & UE data at
300 GeV, 900 GeV, 1.96 TeV, and 7 TeV!
We can study the energy dependence
more precisely than ever before!
HEP Seminar - Baylor
Waco, January 21, 2014
Rick Field – Florida/CDF/CMS
Page 54