ICHEP 2012
Energy Dependence of the UE
Rick Field
University of Florida
Outline of Talk
¨ CDF PYTHIA 6.2 Tevatron
Tune DW predictions.
Melbourne July 4-11, 2012
¨ CMS PYTHIA 6.4 LHC Tune Z1.
¨ LPCC MB&UE working group
“common plots”.
¨ New UE data at 300 GeV, 900 GeV, and 1.96
CDF Run 2
300 GeV, 900 GeV, 1.96 TeV
Outgoing Parton
TeV from the Tevatron Energy-Scan.
¨ New comparisons with PYTHIA 6.2
PT(hard)
Initial-State Radiation
Proton
AntiProton
Underlying Event
Underlying Event
Tune DW and PYTHIA 6.4 Tune Z1.
¨ Much more coming soon!
ICHEP 2012
Melbourne, July 5, 2012
Outgoing Parton
CMS at the LHC
900 GeV, 7 & 8 TeV
Final-State
Radiation
Rick Field – Florida/CDF/CMS
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
Underlying Event
Final-State Radiation
Outgoing Parton
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!
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 2
Tuning PYTHIA 6.2:
Multiple Parton Interaction Parameters
Default
PARP(83)
0.5
PARP(84)
0.2
PARP(85)
0.33
PARP(86)
0.66
PARP(89)
PARP(82)
PARP(90)
PARP(67)
1 TeV
1.9
GeV/c
0.16
1.0
ICHEP 2012
Melbourne, July 5, 2012
Description
Double-Gaussian: Fraction of total hadronic
matter within PARP(84)
Double-Gaussian: Fraction of the overall hadron
radius containing the fraction PARP(83) of the
total hadronic matter.
Determines the energy
Probability that the MPI produces two gluons
dependence of the MPI!
with color connections to the “nearest neighbors.
ore
H ard C
Multiple Parton Interaction
Color String
Color String
Multiple PartonDetermine
Interactionby comparing
Probability that the MPI produces two gluons
either as described by PARP(85) or as a closed
gluon loop. The remaining fraction consists of
quark-antiquark pairs.
with 630 GeV data!
Color String
Determines the reference energy E0.
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)ε with
ε = 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
Hard-Scattering Cut-Off PT0
5
PYTHIA 6.206
ε = 0.25 (Set A))
4
PT0 (GeV/c)
Parameter
Take E0 = 1.8 TeV
3
2
ε = 0.16 (default)
1
100
1,000
10,000
100,000
CM Energy W (GeV)
Reference point
at 1.8 TeV
Page 3
Traditional Approach
CDF Run 1 Analysis Charged Particle Δφ Correlations
Leading Calorimeter Jet or
Charged Jet #1
Leading Charged Particle Jet or
PT > PTmin |η| < ηcut
Direction
Leading Charged Particle or
2π
Away RegionZ-Boson
“Transverse” region
very sensitive to the
“underlying event”!
“Toward-Side” Jet
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
Leading Object
Direction
Δφ
“Toward”
“Transverse”
Transverse
Region
Leading
Object
φ
Toward Region
“Transverse”
Transverse
Region
“Away”
Away Region
0
“Away-Side” Jet
-ηcut
η
+ηcut
¨ Look at charged particle correlations in the azimuthal angle Δφ relative to a leading object (i.e.
CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c ηcut = 1.
¨ Define |Δφ| < 60o as “Toward”, 60o < |Δφ| < 120o as “Transverse”, and |Δφ| > 120o as
“Away”.
¨ All three regions have the same area in η-φ space, Δη×Δφ = 2ηcut×120o = 2ηcut×2π/3. Construct
densities by dividing by the area in η-φ space.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 4
“Transverse” Charged Density
PTmax Direction
"Transverse" Charged Particle Density: dN/dηdφ
Δφ
1.6
“Transverse”
“Transverse”
“Away”
ChgJet#1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
"Transverse" Charged Density
“Toward”
RDF Preliminary
7 TeV
py Tune DW generator level
1.2
PTmax
0.8
ChgJet#1
DY(muon-pair)
70 < M(pair) < 110 GeV
0.4
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
Muon-Pair Direction
Δφ
0
5
10
15
20
25
30
35
40
45
50
PT(chgjet#1) or PTmax or PT(pair) (GeV/c)
“Toward”
“Transverse”
“Transverse”
“Away”
¨ Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5
GeV/c, |η| < 1) at 7 TeV as defined by PTmax, PT(chgjet#1), and PT(muon-pair) from PYTHIA
Tune DW at the particle level (i.e. generator level). Charged particle jets are constructed using
the Anti-KT algorithm with d = 0.5.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 5
Min-Bias “Associated”
Charged Particle Density
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<1.0, PT>0.5 GeV/c)
LHC14
RDF Preliminary
py Tune DW generator level
0.8
LHC10
LHC7
Tevatron
900 GeV
0.4
PTmax = 5.25 GeV/c
RHIC
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
0
25
2
PTmax Direction
“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)
Δφ
4
PTmax Direction
Δφ
“Toward”
“Transverse”
PTmax Direction
1.96 TeV → 14 TeV
(UE increase ~1.9 times)
LHC
“Transverse”
“Away”
Δφ
“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, |η| < 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
Linear scale!
particle level (i.e. generator level).
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 6
Min-Bias “Associated”
Charged Particle Density
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<1.0, PT>0.5 GeV/c)
RDF Preliminary
LHC14
LHC10
LHC7
py Tune DW generator level
0.8
Tevatron
0.4
900 GeV
RHIC
PTmax = 5.25 GeV/c
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0.1
1.0
PTmax Direction
PTmax Direction
“Toward”
LHC7
“Transverse”
7 TeV → 14 TeV
(UE increase ~20%)
“Transverse”
“Away”
100.0
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
Δφ
10.0
Linear on a log plot!
Δφ
“Toward”
LHC14
“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, |η| < 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
Log scale!
particle level (i.e. generator level).
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 7
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<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 (|η|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
2
6
8
10
¨ CMS preliminary data at 900 GeV and 7 TeV ¨
on the “transverse” charged particle density,
dN/dηdφ, as defined by the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |η| < 2. The data are
uncorrected and compared with PYTHIA
Tune DW after detector simulation.
16
18
PTmax Direction
Δφ
“Toward”
“Toward”
“ Transverse”
“Transverse”
“Away”
ICHEP 2012
Melbourne, July 5, 2012
14
20
ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dηdφ, as defined by the leading
charged particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |η| < 2.5. The data are
corrected and compared with PYTHIA Tune
DW at the generator level.
Δφ
“Transverse”
12
PTmax (GeV/c)
PT(chgjet#1) GeV/c
PT(chgjet#1) Direction
4
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 8
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<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 (|η|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
0
50
2
4
6
8
10
12
14
16
18
20
PTmax (GeV/c)
PT(chgjet#1) GeV/c
Charged Particle Density
¨ CMS preliminary data at 900 GeV and 7 TeV ¨ ATLAS preliminary data at 900 GeV and 7
"Transverse" Charged Particle Density: dN/dηdφ
TeV on the “transverse” charged particle
on the “transverse” charged
particle density,
1.2
Preliminary
density,
as defined by the leading
dN/dηdφ, as defined by theRDF
leading
charged
CDF 1.96dN/dηdφ,
TeV
data corrected
pyDW generatorparticles
level
Leading particle
Jet
charged
(PTmax) for charged particles
particle jet (chgjet#1) for charged
with pT > 0.5 GeV/c and |η| < 2.5. The data are
with pT > 0.5 GeV/c and0.8|η| < 2. The data are
corrected and compared with PYTHIA Tune
uncorrected and compared with PYTHIA
DW at the generator level.
Tune DW after detector simulation.
PT(chgjet#1) Direction
0.4
PTmax Direction
Δφ
“Toward”
“Transverse”
Δφ
Charged Particles (PT>0.5 GeV/c, |η| < 1.0)
0.0
“ Transverse”
“Transverse”
0
“Away”
ICHEP 2012
Melbourne, July 5, 2012
“Toward”
50
100
150
200
250
PT(jet#1) GeV/c
Rick Field – Florida/CDF/CMS
300
350
“Transverse”
400
“Away”
Page 9
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<2.0, PT>0.5 GeV/c)
Charged Particles (|η|<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 particle
on the “transverse” charged particle density,
density, dN/dηdφ, as defined by the leading
dN/dηdφ, as defined by the leading charged
charged particle jet (chgjet#1) for charged
particle jet (chgjet#1) for charged particles
particles with pT > 0.5 GeV/c and |η| < 2. The
with pT > 0.5 GeV/c and |η| < 2. The data are
data are uncorrected and compared with
uncorrected and compared with PYTHIA
PYTHIA Tune DW after detector simulation.
Tune DW after detector simulation.
PT(chgjet#1) Direction
PT(chgjet#1) Direction
Δφ
Δφ
“Toward”
“Transverse”
“Toward”
“ Transverse”
“Transverse”
“Away”
ICHEP 2012
Melbourne, July 5, 2012
“ Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 10
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!
ICHEP 2012
Melbourne, July 5, 2012
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 11
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
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 12
CMS UE Data
"Transverse" Charged PTsum Density: dPT/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
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 (|η|<2.0, PT>0.5 GeV/c)
0.0
Charged Particles (|η|<2.0, PT>0.5 GeV/c)
0.0
0
10
20
30
40
50
60
70
80
90
100
0
10
PT(chgjet#1) GeV/c
ICHEP 2012
Melbourne, July 5, 2012
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/dηdφ, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |η| < 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/dηdφ, as defined by the leading
charged particle jet (chgjet#1) for charged
particles with pT > 0.5 GeV/c and |η| < 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 13
ATLAS UE Data
"Transverse" Charged PTsum Density: dPT/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
1.5
RDF Preliminary
RDF Preliminary
7 TeV
ATLAS corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.2
0.8
ATLAS
900 GeV
0.4
Tune Z1
7 TeV
ATLAS corrected data
Tune Z1 generator level
1.0
ATLAS
900 GeV
0.5
Tune Z1
Charged Particles (|η|<2.5, PT>0.5 GeV/c)
Charged Particles (|η|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0
5
10
15
20
25
PTmax (GeV/c)
PTmax (GeV/c)
¨ ATLAS published data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dηdφ, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |η| < 2.5.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
¨ ATLAS published data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dηdφ, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |η| < 2.5.
The data are corrected and compared with
PYTHIA Tune Z1 at the generrator level.
ATLAS publication – arXiv:1012.0791
December 3, 2010
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 14
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-Sta te Radiation
Proton
Proton
Underlying Event
Outgoing Parton
ICHEP 2012
Melbourne, July 5, 2012
Proton
Proton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 15
ALICE-ATLAS UE
"Transverse" Charged PTsum Density: dPT/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
1.5
RDF Preliminary
RDF Preliminary
Tune Z1 generator level
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.2
0.8
ALICE (red)
ATLAS (blue)
0.4
7 TeV
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
5
10
1.0
ALICE (red)
ATLAS (blue)
0.5
7 TeV
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
0.0
0.0
0
15
20
0
25
5
10
20
25
PTmax (GeV/c)
PTmax (GeV/c)
"Transverse" Charged PTsum Density: dPT/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
0.8
0.8
RDF Preliminary
RDF Preliminary
Tune Z1 generator level
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
15
0.6
ALICE (red)
ATLAS (blue)
0.4
0.2
900 GeV
0.6
ALICE (red)
ATLAS (blue)
0.4
0.2
900 GeV
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
0.0
0.0
0
2
4
6
8
10
0
4
6
8
10
PTmax (GeV/c)
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
2
Rick Field – Florida/CDF/CMS
Page 16
New CMS UE Data
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged PTsum Density: dPT/dηdφ
2.0
CMS Preliminary
CMS Preliminary
7 TeV
corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.5
1.0
900 GeV
0.5
CMS
Tune Z1
corrected data
Tune Z1 generator level
1.5
7 TeV
1.0
900 GeV
0.5
Charged Particles (|η|<0.8, PT>0.5 GeV/c)
CMS
Tune Z1
Charged Particles (|η|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
0
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
10
15
20
25
30
PTmax (GeV/c)
¨ CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dηdφ, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |η| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CMS corrected
data!
5
¨ CMS preliminary data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dηdφ, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |η| < 0.8.
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 17
New CMS UE Data
Less than 4% change!
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged PTsum Density: dPT/dηdφ
"Transverse" Charged Particle Density:
dN/dηdφ
2.0
1.5
corrected data
Tune Z1 generator level
1.0
0.5
0.0
0
5
10
CMS Preliminary
7 TeV
RDF Preliminary
PTsum Density (GeV/c)
CMS Preliminary
"Transverse" Charged Density
"Transverse" Charged Density
1.5
900 GeV
corrected data
Tune Z1 generator level
7 TeV
8 TeV
Tune Z1
1.0
1.5
CMS
Tune Z1
0.5
1.0
7 TeV
900 GeV
0.5
Charged Particles (|η|<0.8, PT>0.5 GeV/c)
CMS
Tune Z1
Charged Particles (|η|<0.8, PT>0.5 GeV/c)
0.0
15
20
25
30
0
10 GeV/c)
Charged
Particles
(|η| < 50.8, PT > 0.5
PTmax
(GeV/c)
0.0
15
20
25
30
PTmax (GeV/c)
10 7
15 ¨ CMS
20
25
30 data 35
preliminary
at 900 GeV and 7
¨ CMS preliminary data0 at 9005 GeV and
TeV on the “transverse” charged PTsum
TeV on the “transverse” charged particle PTmax (GeV/c)
density, dPT/dηdφ, as defined by the leading
density, dN/dηdφ, as defined by the leading
charged particle (PTmax) for charged
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |η| < 0.8.
particles with pT > 0.5 GeV/c and |η| < 0.8.
The data are corrected and compared with
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
PYTHIA Tune Z1 at the generator level.
CMS corrected
data!
ICHEP 2012
Melbourne, July 5, 2012
Very nice agreement!
Rick Field – Florida/CDF/CMS
CMS corrected
data!
Page 18
UE Common Plots
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged PTsum Density: dPT/dηdφ
1.6
RDF Preliminary
corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.5
1.0
0.5
CMS (solid red)
ATLAS (solid blue)
ALICE (open black)
7 TeV
RDF Preliminary
corrected data
Tune Z1 generator level
1.2
0.8
7 TeV
0.4
CMS (solid red)
ATLAS (solid blue)
ALICE (open black)
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0
30
5
10
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dηdφ
RDF Preliminary
corrected data
Tune Z1 generator level
corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
RDF Preliminary
0.4
CMS (solid red)
ATLAS (solid blue)
ALICE (open black)
20
25
30
"Transverse" Charged PTsum Density: dPT/dηdφ
0.8
0.2
15
PTmax (GeV/c)
0.8
0.6
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
900 GeV
0.6
0.4
0.2
CMS (solid red)
ATLAS (solid blue)
ALICE (open black)
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
0.0
900 GeV
Charged Particles (|η| < 0.8, PT > 0.5 GeV/c)
0.0
0
2
4
6
8
10
12
14
0
2
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
4
6
8
10
12
PTmax (GeV/c)
Rick Field – Florida/CDF/CMS
Page 19
14
Tevatron Energy Scan
Proton
1 mile
CDF
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
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 20
New CDF UE Data
1.96 TeV
25,371,145 Events
900 GeV
37,075,521 Events
"Transverse" Charged Particle Density: dN/dηdφ
PTmax Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
"Transverse" Charged Density
0.9
CDF Preliminary
1.96 TeV
Corrected Data
0.6
900 GeV
0.3
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
0
5
10
15
20
25
30
35
PTmax (GeV/c)
¨ New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on the “transverse”
charged particle density, dN/dηdφ, as defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5 GeV/c and |η| < 1.0.
300 GeV
7,233,840 Events
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 21
Energy Dependence
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
3.0
CDF Preliminary
CDF Preliminary
1.96 TeV
Corrected Data
Corrected Data
0.6
Ratio
"Transverse" Charged Density
0.9
900 GeV
2.0
0.3
1.96 TeV divided by 300 GeV
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
1.0
0.0
0
5
10
15
20
25
30
35
0
2
4
6
8
10
12
PTmax (GeV/c)
PTmax (GeV/c)
¨ New Corrected CDF data at 300 GeV, 900
¨ Ratio of the CDF data at 300 GeV and 1.96
GeV, and 1.96 TeV on the “transverse”
TeV on the “transverse” charged particle
charged particle density, dN/dηdφ, as defined
density, dN/dηdφ, as defined by the leading
by the leading charged particle (PTmax) for
charged particle (PTmax) for charged
charged particles with pT > 0.5 GeV/c and |η|
particles with pT > 0.5 GeV/c and |η| < 1.0.
< 1.0.
Shows 1.96 TeV divided by 300 GeV.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 22
14
Energy Dependence
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
2.0
CDF Preliminary
CDF Preliminary
1.96 TeV
Corrected Data
Corrected Data
0.6
Ratio
"Transverse" Charged Density
0.9
900 GeV
1.5
0.3
900 GeV divided by 300 GeV
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
1.0
0
5
10
15
20
25
30
35
0
2
PTmax (GeV/c)
4
6
8
10
12
PTmax (GeV/c)
¨ New Corrected CDF data at 300 GeV, 900
¨ Ratio of the CDF data at 300 GeV and 900
GeV, and 1.96 TeV on the “transverse”
GeV on the “transverse” charged particle
charged particle density, dN/dηdφ, as defined
density, dN/dηdφ, as defined by the leading
by the leading charged particle (PTmax) for
charged particle (PTmax) for charged
charged particles with pT > 0.5 GeV/c and |η|
particles with pT > 0.5 GeV/c and |η| < 1.0.
< 1.0.
Shows 900 GeV divided by 300 GeV.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 23
14
Energy Dependence
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
1.6
CDF Preliminary
CDF Preliminary
1.96 TeV
Corrected Data
Corrected Data
0.6
1.4
Ratio
"Transverse" Charged Density
0.9
900 GeV
0.3
1.2
1.96 TeV divided by 900 GeV
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
1.0
0
5
10
15
20
25
30
35
0
PTmax (GeV/c)
5
10
15
20
25
PTmax (GeV/c)
¨ New Corrected CDF data at 300 GeV, 900
¨ Ratio of the CDF data at 900 GeV and 1.96
GeV, and 1.96 TeV on the “transverse”
TeV on the “transverse” charged particle
charged particle density, dN/dηdφ, as defined
density, dN/dηdφ, as defined by the leading
by the leading charged particle (PTmax) for
charged particle (PTmax) for charged
charged particles with pT > 0.5 GeV/c and |η|
particles with pT > 0.5 GeV/c and |η| < 1.0.
< 1.0.
Shows 1.96 TeV divided by 900 GeV.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 24
Energy Dependence
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
0.65
CDF Preliminary
"Transverse" Charged Density
"Transverse" Charged Density
0.9
1.96 TeV
Corrected Data
0.6
900 GeV
0.3
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
CDF Preliminary
Corrected Data
0.55
0.45
0.35
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.25
0.0
0
5
10
15
20
25
30
35
0.1
1.0
10.0
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
¨ New Corrected CDF data at 300 GeV, 900
¨ New Corrected CDF data at 300 GeV, 900
GeV, and 1.96 TeV on the “transverse”
GeV, and 1.96 TeV on the “transverse”
charged particle density, dN/dηdφ, as defined
charged particle density, dN/dηdφ, as defined
by the leading charged particle (PTmax) for
by the leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and |η|
charged particles with pT > 0.5 GeV/c and |η|
< 1.0.
< 1.0 for 5.0 < PTmax < 6.0 GeV/c.
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 25
PYTHIA 6.2 Tune DW
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
3.0
CDF Preliminary
CDF Preliminary
Corrected Data
Tune DW Generator Level
1.96 TeV
Tune DW
Corrected Data
Tune DW Generator Level
0.6
Ratio
"Transverse" Charged Density
0.9
900 GeV
2.0
0.3
1.96 TeV divided by 300 GeV
PYTHIA Tune DW
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
1.0
0.0
0
5
10
15
20
25
30
0
35
2
4
6
8
10
12
14
PTmax (GeV/c)
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
2.0
1.6
CDF Preliminary
CDF Preliminary
Tune DW
Corrected Data
Tune DW Generator Level
Tune DW
Corrected Data
Tune DW Generator Level
Ratio
Ratio
1.4
1.5
1.2
900 GeV divided by 300 GeV
1.96 TeV divided by 900 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
1.0
1.0
0
2
4
6
8
10
12
14
0
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
5
10
15
20
25
PTmax (GeV/c)
Rick Field – Florida/CDF/CMS
Page 26
PYTHIA 6.4 Tune Z1
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
0.65
CDF Preliminary
"Transverse" Charged Density
"Transverse" Charged Density
0.9
1.96 TeV
Corrected Data
Tune Z1 Generator Level
0.6
900 GeV
0.3
PYTHIA Tune Z1
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
0.55
CDF Preliminary
Corrected Data
Tune Z1 Generator Level
0.45
PYTHIA Tune Z1
0.35
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.25
0
5
10
15
20
25
30
35
0.1
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
1.0
10.0
Center-of-Mass Energy (TeV)
Rick Field – Florida/CDF/CMS
Page 27
PYTHIA 6.4 Tune Z1
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dηdφ
dN/dηdφ
0.65
3.0
CDF Preliminary
"Transverse"Ratio
Charged Density
"Transverse" Charged Density
0.9
1.96 TeV
Corrected Data
Tune Z1 Generator Level
0.6
900 GeV
0.3
PYTHIA Tune Z1
300 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
5
10
15
20
25
30
35
Tune Z1
CorrectedData
Data
Corrected
Tune Z1 Generator Level
0.55 Tune Z1 Generator Level
2.0
0.45
PYTHIA Tune Z1
1.96
divided
by GeV/c
300 GeV
5.0 TeV
< PTmax
< 6.0
0.35
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
1.0
0.25
00.1
0.0
0
CDFPreliminary
Preliminary
CDF
2
4
6
1.0
8
10
12
14
10.0
PTmax (GeV/c)
Center-of-Mass
Energy (TeV)
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
2.0
1.6
CDF Preliminary
CDF Preliminary
Tune Z1
Corrected Data
Tune Z1 Generator Level
Tune Z1
Corrected Data
Tune Z1 Generator Level
Ratio
Ratio
1.4
1.5
1.2
900 GeV divided by 300 GeV
1.96 TeV divided by 900 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
1.0
1.0
0
2
4
6
8
10
12
14
0
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
5
10
15
20
25
PTmax (GeV/c)
Rick Field – Florida/CDF/CMS
Page 28
PYTHIA
6.4
Tune
Z1
ATLAS
CMS
"Transverse" Charged Particle Density: dN/dηdφ
0.9
1.2
"Transverse"Ratio
Charged Density
0.65
3.0
CDF Preliminary
1.96 TeV
RDF Preliminary
Corrected Data
Tune Z1 Generator Level
Corrected Data
0.6
0.3
"Transverse" Charged Density
"Transverse" Charged Density
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dηdφ
dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
900 GeV
0.8
PYTHIA Tune Z1
300 GeV
0.0
0
5
10
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
15
20
25
30
ALICE
CDF
300 GeV
CDF Preliminary
PYTHIA Tune Z1
1.96 TeV
2
4
CDF
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
6
1.0
CDF
8
10
12
14
10.0
PTmax (GeV/c)
Center-of-Mass
Energy (TeV)
"Transverse" Charged Particle Density: dN/dηdφ
PYTHIA Tune Z1
1.6
CDF Preliminary
Charged
Particles
(PT>0.5 GeV/c)
Corrected
Data
Tune Z1
Tune Z1 Generator Level
0.0
5
10
15
Ratio
1.4
0
1.5
1.96
divided
by GeV/c
300 GeV
5.0 TeV
< PTmax
< 6.0
0.35
Tune Z1
Corrected Data
Tune Z1 Generator Level
Ratio
7 TeV
2.0
0.45
900 GeV
0.4
Tune Z1
CorrectedData
Data
Corrected
Tune Z1 Generator Level
0.55 Tune Z1 Generator Level
1.0
0.25
00.1
35
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dηdφ
2.0
CDFPreliminary
Preliminary
CDF
20
25
30
35
PTmax (GeV/c)
1.2
900 GeV divided by 300 GeV
1.96 TeV divided by 900 GeV
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
1.0
1.0
0
2
4
6
8
10
12
14
0
PTmax (GeV/c)
ICHEP 2012
Melbourne, July 5, 2012
5
10
15
20
25
PTmax (GeV/c)
Rick Field – Florida/CDF/CMS
Page 29
PTmax versus Leading Jet
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
1.2
CDF Published
"Transverse" Charged Density
"Transverse" Charged Density
1.2
Corrected Data
0.9
0.6
1.96 TeV
0.3
PYTHIA Tune Z1
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
CDF Preliminary
Corrected Data
Tune Z1 generator level
0.9
0.6
1.96 TeV
0.3
PYTHIA Tune Z1
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
0
50
100
150
200
250
300
350
400
0
5
PT(jet#1) (GeV/c)
10
15
20
25
30
PTmax (GeV/c)
¨ Published CDF Run 2 data at 1.96 TeV on
the “transverse” charged particle density,
dN/dηdφ, as defined by the leading
calorimeter jet (jet#1) for charged particles
with pT > 0.5 GeV/c and |η| < 1.0 compared
Yikes!
with PYTHIA Tune Z1.
¨ New CDF data 1.96 TeV on the “transverse”
charged particle density, dN/dηdφ, as defined
by the leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and |η|
< 1.0 compared with PYTHIA Tune Z1.
???
ICHEP 2012
Melbourne, July 5, 2012
35
Rick Field – Florida/CDF/CMS
Page 30
PTmax versus Leading Jet
"Transverse"
"Transverse"Charged
ChargedParticle
Particle Density:
Density:dN/dηdφ
dN/dηdφ
"Transverse" Charged Particle Density: dN/dηdφ
1.2
CDF
CDFPublished
Preliminary
"Transverse" Charged Density
"Transverse" Charged
Charged Density
Density
"Transverse"
1.2
1.2
Corrected
Corrected
Data
Data
0.9
0.9
0.6
0.6
Leading Jet
PTmax
0.3
0.3
1.96
1.96TeV
TeV
PYTHIA
PYTHIATune
TuneZ1
Z1
Charged
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
CDF Preliminary
Corrected Data
Tune Z1 generator level
0.9
0.6
1.96 TeV
0.3
PYTHIA Tune Z1
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0.0
00
50
50
100
100
150
150
200
200
250
250
300
300
350
350
400
400
0
5
PTmax
PT(jet#1)
or PT(jet#1)
(GeV/c)
(GeV/c)
10
15
20
25
30
PTmax (GeV/c)
¨ Published CDF Run 2 data at 1.96 TeV on
the “transverse” charged particle density,
dN/dηdφ, as defined by the leading
calorimeter jet (jet#1) for charged particles
with pT > 0.5 GeV/c and |η| < 1.0 compared
Yikes!
with PYTHIA Tune Z1.
¨ New CDF data 1.96 TeV on the “transverse”
charged particle density, dN/dηdφ, as defined
by the leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and |η|
< 1.0 compared with PYTHIA Tune Z1.
???
ICHEP 2012
Melbourne, July 5, 2012
35
Rick Field – Florida/CDF/CMS
Page 31
PTmax versus Leading Jet
"Transverse" Charged Particle Density: dN/dηdφ
"Transverse"
"Transverse"Charged
ChargedParticle
Particle Density:
Density:dN/dηdφ
dN/dηdφ
1.2
CDF
CDFPublished
Preliminary
"Transverse"
"Transverse" Charged
Charged Density
Density
"Transverse" Charged
Charged Density
Density
"Transverse"
1.2
1.2
Corrected
Corrected
Data
Data
0.9
0.9
0.6
0.6
Leading Jet
PTmax
0.3
0.3
1.96
1.96TeV
TeV
PYTHIA
PYTHIATune
TuneZ1
Z1
Charged
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
CDFPreliminary
Preliminary
CDF
Corrected Data
Corrected Data
Tune Z1 generator level
0.9
0.6
1.96
TeV
1.96
TeV
Leading Jet
0.3
PYTHIA
Tune
Z1 Z1
PYTHIA
Tune
PTmax
Charged
Charged Particles
Particles (|η|<1.0,
(|η|<1.0, PT>0.5
PT>0.5 GeV/c)
GeV/c)
0.0
0.0
0.0
00
50
50
100
100
150
150
200
200
250
250
300
300
350
350
400
400
0
10 5
20
30
10
4015
50
2060
7025
80
30 90
PTmaxPTmax
or PT(jet#1)
(GeV/c)
(GeV/c)
PTmax
PT(jet#1)
or PT(jet#1)
(GeV/c)
(GeV/c)
¨ Published CDF Run 2 data at 1.96 TeV on
the “transverse” charged particle density,
dN/dηdφ, as defined by the leading
calorimeter jet (jet#1) for charged particles
with pT > 0.5 GeV/c and |η| < 1.0 compared
Yikes!
with PYTHIA Tune Z1.
¨ New CDF data 1.96 TeV on the “transverse”
charged particle density, dN/dηdφ, as defined
by the leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and |η|
< 1.0 compared with PYTHIA Tune Z1.
???
ICHEP 2012
Melbourne, July 5, 2012
100
35
Rick Field – Florida/CDF/CMS
Page 32
PTmax versus Leading Jet
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dηdφ
dN/dηdφ
"Transverse"
"Transverse"Charged
ChargedParticle
Particle Density:
Density:dN/dηdφ
dN/dηdφ
1.2
1.2
CDF
CDFPublished
Preliminary
"Transverse"
"Transverse" Charged
Charged Density
Density
"Transverse"
Charged
Density
"Transverse" Charged
Charged Density
Density
"Transverse"
1.2
1.2
Corrected
Corrected
Data
Data
0.9
0.9
0.6
0.6
Leading Jet
PTmax
0.3
0.3
1.96
1.96TeV
TeV
PYTHIA
PYTHIATune
TuneZ1
Z1
Charged
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
CDF
Preliminary
CDF
Preliminary
CDF
Preliminary
Corrected
Data
Corrected
Data
Corrected Data
Tune Z1 generator level
0.9
0.9
PTmax
0.6
0.6
1.96
TeV
1.96
TeV
1.96
TeV
Leading Jet
0.3
0.3
PTmax
PYTHIA
Tune
PYTHIA
Tune
Z1 Z1Z1
PYTHIA
Tune
Leading Jet Charged
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Particles
(|η|<1.0,
PT>0.5
GeV/c)
0.0
0.0
0.0
0.0
00
50
50
100
100
150
150
200
200
250
250
300
300
350
350
400
400
00
10 55
20 1010
30
15
4015
50
20
2060 25
7025 30 80
90
3035
PTmax
PTmax
or
orPT(jet#1)
PT(jet#1)
(GeV/c)
(GeV/c)
PTmax
(GeV/c)
PTmax
PT(jet#1)
or PT(jet#1)
(GeV/c)
(GeV/c)
¨ Published CDF Run 2 data at 1.96 TeV on
the “transverse” charged particle density,
dN/dηdφ, as defined by the leading
calorimeter jet (jet#1) for charged particles
with pT > 0.5 GeV/c and |η| < 1.0 compared
Yikes!
with PYTHIA Tune Z1.
¨ New CDF data 1.96 TeV on the “transverse”
charged particle density,
dN/dηdφ, as defined
Okay
by the leading charged particle (PTmax) for
No with
inconsistency
charged particles
pT > 0.5 GeV/c and |η|
But
need
toTune Z1.
< 1.0 compared with PYTHIA
understand!
???
ICHEP 2012
Melbourne, July 5, 2012
100
40
35
Rick Field – Florida/CDF/CMS
Page 33
More Coming Soon!
¨ CDF - Many More UE Observables: Nchg density, PTsum
density, average pT, “toward”, “away”, “transverse”,
“transMAX”, “transMIN”, distributions, etc..
¨ CDF - Two η Ranges: Must do (pT > 0.5 GeV/c, |η| < 0.8)
as well as (pT > 0.5 GeV, |η| < 1).
¨ CDF - Min-Bias: Many MB observables: Multiplicity,
dN/dη, pT distribution, <pT> versus Nchg, etc.
Soon we will have MB & UE data at
300 GeV, 900 GeV, 1.96 TeV, 7 TeV, and 8 TeV!
We can study the energy dependence
more precisely than ever before!
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 34
More Coming Soon!
¨ CDF - Many More UE Observables: Nchg density, PTsum
density, average pT, “toward”, “away”, “transverse”,
“transMAX”, “transMIN”, distributions, etc..
¨ CDF - Two η Ranges:
Must
do (pT > 0.5
GeV/c, |η| < 0.8)
What we
are learning
should
as well as (pT > 0.5 allow
GeV, for
|η| <more
1). precise
predictions at the future
¨ CDF - Min-Bias: Many
MB observables:
LHC energy
of 13 TeV! Multiplicity,
dN/dη, pT distribution, <pT> versus Nchg, etc.
Soon we will have MB & UE data at
300 GeV, 900 GeV, 1.96 TeV, 7 TeV, and 8 TeV!
We can study the energy dependence
more precisely than ever before!
ICHEP 2012
Melbourne, July 5, 2012
Rick Field – Florida/CDF/CMS
Page 35