ISMD 2013
“softQCD” and Correlations
Conveners
Rick Field & Nick Van Remortel
Session 1 (9:00am-10:30am)
 Tevatron Energy Scan: Findings & Surprises (Rick Field).
 Results on the UE and DPS with the CMS Detector (Roberta Arcidiacono).
 Results on the UE and DPS with the ATLAS Detector (Benjamin Wynne).
 Underlying Event Studies at the Tevatron and the LHC (Deepak Kar).
Session 2 (11:00am-1:00pm)
 Aspects of soft QCD, correlations, particle spectra and multiplicities (Nick Van Remortel).
 Improved Isolation of the UE based on MB Trigger-Associated Hadron Correlations (Tom Trainor).
 Color Reconnection and Its Effect on Precise Measurements at the LHC (Torbjörn Sjöstrand).
 Studies of the Helix Model Using pp Collisions (Sarka Todorova).
 High Multiplicity in pp Interactions at U-70 (Elena Kokoulina).
 Measurement of Charged Kaon Correlations at Small Relative Momentum in the SELEX Experiment
(Grigory Nigmatkulov)
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 1
ISMD13 “softQCD”
Tevatron Energy Scan: Findings & Surprises
Rick Field
University of Florida
Proton
CDF
1 mile
Outline of Talk
 LPCC MB&UE working group “common plots”.
 CDF MB “common plots” from the Tevatron
Energy Scan.
 CDF UE “common plots” from the Tevatron
Energy Scan.
AntiProton
CDF Run 2
300 GeV, 900 GeV, 1.96 TeV
 Mapping out the energy dependence of
MB & UE: Tevatron to the LHC!
Outgoing Parton
 CDF new UE observables from the Tevatron
Energy Scan.
Initial-State Radiation
Proton
 Comparisons with PYTHIA 6.4 Tune Z1,
PYTHIA 6.4 Tune Z2*, and PYTHIA 8
Tune 4C.
 Summary & Conclusions.
ISMD 2013 Chicago
September 17, 2013
PT(hard)
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
CMS at the LHC
900 GeV, 7 & 8 TeV
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 2
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
ISMD 2013 Chicago
September 17, 2013
Proton
Proton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 3
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 4
MB Common Plots 7 TeV
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 5
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
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 6
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 7
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 8
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 9
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 10
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 11
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.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 12
Overall Charged Particle Density
Overall Charged Particle Density
Pseudo-Rapidity Distribution: dN/dh
3
0.50
CDF Preliminary
Corrected Data
2
900 GeV
300 GeV
1
Charged Density
Average Number
RDF Preliminary
1.96 TeV
Corrected Data
CMS red squares
CDF blue dots
0.40
0.30
At least 1 charged particle
At least 1 charged particle
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.20
0
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
0.1
1.0
Pseudo-Rapidity
 Corrected CDF data on the pseudo-rapidity 
distribution, dN/dh, for charged with pT > 0.5
GeV/c and |h| < 0.8 for events with at least one
charged particle with pT > 0.5 GeV/c and |h| <
0.8.
Ecm
Nchg
error
NchgDen
error
300 GeV
2.241
0.175
0.223
0.017
900 GeV
3.012
0.203
0.300
0.020
1.96 TeV
3.439
0.186
0.342
0.019
ISMD 2013 Chicago
September 17, 2013
1.0
10.0
Center-of-Mass Energy (TeV)
Corrected CDF and CMS data overall density of
charged particles with pT > 0.5 GeV/c and |h| <
0.8 for events with at least one charged particle
with pT > 0.5 GeV/c and |h| < 0.8 plotted versus
the center-of-mass energy (log scale). The data
are corrected to the particle level with errors
that include both the statistical error and the
systematic uncertainty.
0.8
N chg 
dN
0.8 dh dh
Rick Field – Florida/CDF/CMS
Page 13
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×2p/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×2p/3, averaged over all events with
at least one particle with pT > 0.5 GeV/c, |h| < hcut.
PTmax Direction
f
“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
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 14
New UE Observables
 “transMAX” and “transMIN” Charged Particle Density: Number
of charged particles (pT > 0.5 GeV/c, |h| < 0.8) in the the maximum
(minimum) of the two “transverse” regions as defined by the
leading charged particle, PTmax, divided by the area in h-f space,
2hcut×2p/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×2p/6, averaged over all events with at least one particle
with pT > 0.5 GeV/c, |h| < hcut.
PTmax Direction
f
“Toward”
“TransMAX”
“TransMIN”
“Away”
Note: The overall “transverse” density is equal to the average of the “transMAX” and
“TransMIN” densities. The “TransDIF” Density is the “transMAX” Density minus the
“transMIN” Density
“Transverse” Density = “transAVE” Density = (“transMAX” Density + “transMIN” Density)/2
“TransDIF” Density = “transMAX” Density - “transMIN” Density
hcut = 0.8
ISMD 2013 Chicago
September 17, 2013
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. “transDIF”) is very sensitive to initial-state radiation (ISR) Jet #3
and final-state radiation (FSR).
“TransMIN” density more sensitive to MPI & BBR.
PTmax Direction
“Toward-Side” Jet
f
“Toward”
“TransMAX”
“TransMIN”
“Away”
“Away-Side” Jet
“TransDIF” density more sensitive to ISR & FSR.
0 ≤ “TransDIF” ≤ 2×”TransAVE”
“TransDIF” = “TransAVE” if “TransMIX” = 3×”TransMIN”
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 16
PTmax UE Data
 CDF PTmax UE Analysis: “transMAX”, “transMIN”, “transAVE”,
and “transDIF” charged particle and PTsum densities (pT > 0.5
GeV/c, |h| < 0.8) in proton-antiproton collisions at 300 GeV, 900
GeV, and 1.96 TeV (R. Field analysis).
 CMS PTmax UE Analysis: “transMAX”, “transMIN”,
“transAVE”, and “transDIF” charged particle and PTsum densities
(pT > 0.5 GeV/c, |h| < 0.8) in proton-proton collisions at 900 GeV
and 7 TeV (M. Zakaria analysis). The “transMAX”, “transMIN”,
and “transDIF” are not yet approved so I can only show
“transAVE” which is approved.
PTmax Direction
f
“Toward”
“TransMAX”
“TransMIN”
“Away”
 CMS UE Tunes: PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4
Tune Z2* (CTEQ6L). Both were tuned to the CMS leading chgjet
“transAVE” UE data at 900 GeV and 7 TeV.
 PYTHIA 8: Some comparisons with PYTHIA 8 Tune 4C
(CTEQ6L), Richard Corke and Torbjörn Sjöstrand, JHEP
1103:032 (2011), arXiv:1011.1759.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 17
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
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0.4
0.4
77TeV
TeV
10
10
10
15
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15
20
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20
25
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30
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30
0.0
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0.0
000
555
10
10
10
0.8
0.8
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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)
ISMD 2013 Chicago
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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)
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LHC
CDF versus CMS
"TransAVE" Charged Particle Density: dN/dhdf
"TransAVE"
"TransAVE" Charged
Charged PTsum
PTsum Density:
Density: dPT/dhdf
dPT/dhdf
0.75
0.78
0.78
RDF
RDF Preliminary
Preliminary
corrected
corrected data
data
CDF
CDF
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum
Charged Particle Density
RDF
RDF Preliminary
Preliminary
0.50
0.25
CMS
CMS
ATLAS
ALICE
900
900 GeV
GeV
0
4
8
12
16
CDF
CDF
ALICE
0.52
0.52
ATLAS
0.26
0.26
CMS
CMS
900
900 GeV
GeV
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.00
corrected
corrected data
data
0.00
0.00
20
00
PTmax (GeV/c)
44
88
12
12
16
16
PTmax
PTmax (GeV/c)
(GeV/c)
 CDF and CMS data at 900 GeV/c on the
 CDF and CMS data at 900 GeV/c on the
charged PTsum density in the “transverse”
charged particle density in the “transverse”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8. The data are
pT > 0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors
corrected to the particle level with errors
that include both the statistical error and
that include both the statistical error and
the systematic uncertainty.
the systematic uncertainty.
ISMD 2013 Chicago
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Rick Field – Florida/CDF/CMS
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20
20
“TransAVE” Density
"Transverse" Charged PTsum Density: dPT/dhdf
"TransAVE" Charged Particle Density: dN/dhdf
RDF Preliminary
Corrected Data
Generator Level Theory
1.5
RDF Preliminary
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
PTsum Density (GeV/c)
Charged Particle Density
1.5
7 TeV
1.0
1.96 TeV
900 GeV
0.5
300 GeV
7 TeV
Corrected Data
Generator Level Theory
1.0
1.96 TeV
900 GeV
0.5
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
PTmax (GeV/c)
PTmax (GeV/c)
 Corrected CMS data at 7 TeV and CDF data  Corrected CMS data at 7 TeV and CDF data
at 1.96 TeV, 900 GeV, and 300 GeV on the
at 1.96 TeV, 900 GeV, and 300 GeV on the
charged particle density in the “transAVE”
charged PTsum density in the “transAVE”
region as defined by the leading charged
region as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8. The data are
pT > 0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors that
corrected to the particle level with errors that
include both the statistical error and the
include both the statistical error and the
systematic uncertainty. The data are
systematic uncertainty. The data are
compared with PYTHIA Tune Z1 and Tune
compared with PYTHIA Tune Z1 and Tune
Z2*.
Z2*.
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Rick Field – Florida/CDF/CMS
Page 20
“TransAVE” vs Ecm
"TransAVE"
Charged
Particle
Density
Ratio
"TransAVE"
Charged
Particle
Density:
dN/dhdf
"TransAVE"
Charged
Particle
Density
Ratio
1.1
4.0
4.0
RDF
RDF Preliminary
Preliminary
CMS
solid
dotsdots
CMS
solid
CDF
solid
squares
CDF
solid
squares
CDF
corrected
correcteddata
data
generator
generatorlevel
leveltheory
theory
0.8
2.6
3.2
Tune Z2* (solid lines)
TuneZ1
Z2*(dashed
(solid lines)
Tune
lines)
Tune
Z1Z2*
(dashed
Tune
(solidlines)
lines)
Tune Z1 (dashed lines)
Divided by 300 GeV Value
0.5
1.8
2.1
Divided by 300 GeV Value
5.0
<PTmax
PTmax
<6.0
6.0
GeV/c
5.0
GeV/c
5.0
< <PTmax
< <6.0
GeV/c
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.2
1.0
1.0
0.1
0.1
1.0
1.0
10.0
10.0
100.0
Charged
PTsum
Density
(GeV/c)
Particle
Density
Ratio
Particle
Density
Ratio
Charged
ParticleParticle
DensityDensity
Ratio
Particle
Density
Ratio
1.1
3.4
4.3
"TransAVE"
Charged
PTsum
Density:
dPT/dhdf
"TransAVE"
Charged
PTsum
Density
Ratio
"TransAVE"
Charged
PTsum
Density
Ratio
RDF Preliminary
RDF Preliminary
CMS
solid dots
CMS
CMSsolid
soliddots
dots
CDF
solid
squares
CDF
solid
CDF solidsquares
squares
corrected data
corrected data
generator level theory
generator level theory
0.8
3.0
3.0
Tune Z2* (solid lines)
Tune Z2* (solid lines)
Tune
(solid lines)
Tune
Z1Z2*
(dashed
Tune Z1 (dashed lines)
Tune Z1 (dashed lines)
Divided by 300 GeV Value
0.5
2.0
2.0
5.0
< PTmax << 6.0
GeV/c
5.0
5.0< <PTmax
PTmax <6.0
6.0GeV/c
GeV/c
Divided by 300 GeV Value
Charged
Particles (|h|<0.8,
PT>0.5 GeV/c)
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.2
1.0
1.0
0.1
0.1
0.1
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
1.0
1.0
1.0
10.0
10.0
100.0
10.0
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
 Corrected CMS data at 900 GeV and 7 TeV  Corrected CMS data at 900 GeV and 7 TeV
and CDF data at 1.96 TeV, 900 GeV, and 300
and CDF data at 1.96 TeV, 900 GeV, and 300
GeV on the charged PTsum density in the
GeV on the charged particle density in the
“transAVE” region as defined by the leading
“transAVE” region as defined by the leading
charged particle (PTmax) for charged
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8
particles with pT > 0.5 GeV/c and |h| < 0.8
with 5 < PTmax < 6 GeV/c. The data are
with 5 < PTmax < 6 GeV/c. The data are
plotted versus the center-of-mass energy
plotted versus the center-of-mass energy
(log scale). The data are compared with
(log scale). The data are compared with
PYTHIA 6.4 Tune Z1 and Tune Z2*.
PYTHIA 6.4 Tune Z1 and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
ISMD 2013 Chicago
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Rick Field – Florida/CDF/CMS
Page 21
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
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30 Density: dN/dhdf
25
20
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10
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Particle
 Corrected CDF data on
particle
PTmax (GeV/c)
0.4
density, in the “transverse” region as
CDF Preliminary
defined by the leading charged particle
Corrected Data
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8. The data are corrected
0.2
to the particle level with errors that include
both the statistical error and the systematic
Overall density
300 GeV
uncertainty and are compared with the
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
overall charged particle density (straight
0.0
lines).
0
2
4
6
8
10
12
14
PTmax (GeV/c)
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Rick Field – Florida/CDF/CMS
Page 22
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
CDF
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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0.1
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1.0
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"Transverse" Charged
Charged Density
Density
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0.8
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5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
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Particles(|h|<0.8,
(|h|<0.8,PT>0.5
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
Particle Density
Density
Amazing!
1.0
1.0
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Preliminary
RDF
Corrected Data
Data
Corrected
0.8
0.8 Tune Z1 Generator Level
Charged Density
Density
Charged
 Corrected CDF and CMS data on the
overall density of charged particles with pT
> 0.5 GeV/c and |h| < 0.8 for events with at
least one charged particle with pT > 0.5
GeV/c and |h| < 0.8 and on the charged
particle density, in the “transverse” region
as defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c. The data are plotted versus the
center-of-mass energy (log scale).
ISMD 2013 Chicago
September 17, 2013
CMS
red
squares
CMS
red
squares
CDF
blue
dots
CDF blue dots
0.6
0.6
"Transverse"
"Transverse"
55<<PTmax
PTmax<<66GeV/c
GeV/c
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 23
“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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20
25
30
35
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Particles
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Center-of-Mass
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(Nchg ≥ 1)!
0.1
1.0 Corrected
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
CDF and CMS
 Corrected CDF and CMS data on the
(TeV)
charged
particle density ratio, in the
charged particle density ratio, in the Center-of-Mass Energy
“transverse” region as defined by the
“transverse” region as defined by the
leading charged particle (PTmax) for
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
charged particles with pT > 0.5 GeV/c and
|h| < 0.8 for 5 < PTmax < 6 GeV/c. The ratio
|h| < 0.8. The ratio corresponds to the
corresponds to the “transverse” charged
“transverse” charged particle density
particle density divided by the overall
divided by the overall charged particle
charged particle density (Nchg ≥ 1). The data
density (Nchg ≥ 1).
are plotted versus the center-of-mass energy
(log scale).
0
5
10
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Rick Field – Florida/CDF/CMS
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“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
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(GeV/c)
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"Transverse" Charged Particle Density: dN/dhdf
0.72
"Transverse" Charged
Charged Density
Density
"Transverse"
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX” and
“transMIN” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
ISMD 2013 Chicago
September 17, 2013
12
CDF Preliminary
CDF Preliminary
300 GeV
Corrected Data
corrected data
Generator Level Theory
"TransMAX"
"TransMAX"
0.48
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.24
"TransMIN"
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
0.00
0
Rick Field – Florida/CDF/CMS
2
4
6
8
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PTmax (GeV/c)
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“transDIF/AVE” NchgDen
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
0.9
0.9
0.9
Corrected
CorrectedData
Data
Generator Level Theory
CDF Preliminary
"TransDIF"
Charged Particle Density
Charged Particle Density
CDF
CDF Preliminary
Preliminary
0.6
"TransAVE"
0.3
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
1.96 TeV
Corrected Data
Generator Level Theory
"TransDIF"
"TransDIF"
0.6
0.6
"TransAVE"
"TransAVE"
0.3
0.3
900
900 GeV
GeV
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
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0.0
0.0
0
4
8
12
16
00
20
44
88
16
16
20
20
PTmax
PTmax (GeV/c)
(GeV/c)
PTmax (GeV/c)
"Transverse" Charged Particle Density: dN/dhdf
0.6
Charged Particle
Particle Density
Density
Charged
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transAVE” and “transDIF”
regions as defined by the leading charged
particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |h| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
ISMD 2013 Chicago
September 17, 2013
12
12
CDF Preliminary
Preliminary
CDF
CorrectedData
Data
Corrected
Generator Level Theory
"TransDIF"
0.4
"TransAVE"
0.2
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
2
Rick Field – Florida/CDF/CMS
4
6
8
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PTmax (GeV/c)
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“transMAX/MIN” NchgDen
"TransMIN" Charged Particle Density: dN/dhdf
"TransMIN"
"TransMAX" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"TransMAX"
0.39
0.39
CDF
CDFPreliminary
Preliminary
1.96 TeV
Corrected Data
Corrected Data
Generator Level Teory
1.96 TeV
Charged
Charged Particle
Particle Density
Density
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Density
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Charged
Density
1.2
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Tune Z1 (dashed lines)
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Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
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0.0
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16
16
CDF Preliminary
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300 GeV
0.00
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20
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44
88
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Particle Density
Density
Charged
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX”, “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
ISMD 2013 Chicago
September 17, 2013
1.96 TeV
Corrected Data
Generator Level Theory
0.6
0.6
1.961.96
TeVTeV
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Data
Generator Level Theory
900
GeV
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GeV
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Tune Z1 (dashed lines)
Charged
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Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
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Rick Field – Florida/CDF/CMS
44
88
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12
16
16
PTmax
PTmax (GeV/c)
(GeV/c)
Page 27
20
20
“transMAX/MIN” PTsumDen
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
1.2
1.5
Corrected
CorrectedData
Data
Generator Level Theory
1.96 TeV
1.0
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
CDF
Preliminary
CDF
Preliminary
"TransMAX"
PTsum
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum Density (GeV/c)
CDF
CDFPreliminary
Preliminary
"TransMIN"
Corrected
Data
Corrected
Data
Generator Level Theory
900 GeV
"TransMAX"
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.4
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
4
8
12
16
0
20
4
8
16
20
"Transverse" Charged PTsum Density: dPT/dhdf
0.72
CDFPreliminary
Preliminary
CDF
PTsum Density
Density (GeV/c)
(GeV/c)
PTsum
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum
density in the “transMAX” and
“transMIN” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|h| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
ISMD 2013 Chicago
September 17, 2013
12
PTmax (GeV/c)
PTmax (GeV/c)
300 GeV
CorrectedData
Data
Corrected
Generator Level Theory
"TransMAX"
0.48
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.24
"TransMIN"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.00
0
2
Rick Field – Florida/CDF/CMS
4
6
8
10
12
PTmax (GeV/c)
Page 28
14
“transDIF/AVE” PTsumDen
dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged
Charged PTsum
PTsum Density:
Density: dPT/dhdf
dPT/dhdf
"Transverse"
0.9
0.9
1.2
1.2
CDF
CDFPreliminary
Preliminary
Corrected
Corrected Data
Data
Generator Level Theory
PTsum Density (GeV/c)
PTsum Density (GeV/c)
CDF Preliminary
"TransDIF"
"TransDIF"
0.8
0.8
"TransAVE"
"TransAVE"
0.4
0.4
Tune Z2* (solid lines)
1.96Z1TeV
Tune
(dashed lines)
1.96 TeV
Corrected
CorrectedData
Data
Generator Level Theory
"TransDIF"
"TransDIF"
0.6
0.6
"TransAVE"
"TransAVE"
0.3
0.3
Tune Z2* (solid lines)
900
Tune
Z1 GeV
(dashed lines)
900 GeV
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
0.0
0.0
0.0
0.0
00
44
88
12
12
16
16
00
20
20
44
88
16
16
20
20
PTmax (GeV/c)
(GeV/c)
PTmax
PTmax (GeV/c)
(GeV/c)
PTmax
"Transverse" Charged PTsum Density: dPT/dhdf
0.6
CDF
CDFPreliminary
Preliminary
PTsum
PTsum Density
Density (GeV/c)
(GeV/c)
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum
density in the “transAVE” and “transDIF”
regions as defined by the leading charged
particle (PTmax) for charged particles
with pT > 0.5 GeV/c and |h| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
The data are compared with PYTHIA 6.4
Tune Z1 and Tune Z2*.
ISMD 2013 Chicago
September 17, 2013
12
12
Corrected
CorrectedData
Data
Generator Level Theory
"TransDIF"
0.4
"TransAVE"
0.2
Tune Z2* (solid lines)
GeV lines)
Tune 300
Z1 (dashed
300 GeV
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
2
Rick Field – Florida/CDF/CMS
4
6
8
10
12
PTmax (GeV/c)
Page 29
14
“transMAX” NchgDen vs Ecm
"TransMAX" Charged Particle Density: dN/dhdf
"TransMAX" Charged Particle Density: dN/dhdf
0.96
CDF Preliminary
CDF Preliminary
1.96 TeV
Corrected Data
Charged Particle Density
"TransMAX" Charged Density
1.2
0.8
900 GeV
0.4
300 GeV
Corrected Data
0.64
0.32
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.00
0
4
8
12
16
20
0.1
PTmax (GeV/c)
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX” region as
defined by the leading charged particle
(PTmax) for charged particles with pT >
0.5 GeV/c and |h| < 0.8. The data are
corrected to the particle level with errors
that include both the statistical error and
the systematic uncertainty.
ISMD 2013 Chicago
September 17, 2013
1.0
10.0
Center-of-Mass Energy (GeV)
 Corrected CDF data on the charged particle
density in the “transMAX” region as
defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 0.8 with 5 < PTmax < 6
GeV/c. The data are plotted versus the
center-of-mass energy (log scale).
Rick Field – Florida/CDF/CMS
Page 30
“TransMAX/MIN” vs Ecm
"Transverse"
Charged
PTsum
Density
Ratio
"Transverse"
Charged
PTsum
Density:
dPT/dhdf
"Transverse"
Charged
Particle
Density
Ratio
"Transverse"
Charged
Particle
Density:
"Transverse"
Charged
Particle
DensitydN/dhdf
Ratio
7.3
1.8
6.4
CDF
Preliminary
CDF
CDFPreliminary
Preliminary
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
corrected
data
corrected
data
corrected
data
generator
level
theory
generator
level
theory
generator
level
theory
1.0
3.8
4.8
5.0 < PTmax < 6.0 GeV/c
5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
Tune Z2* (solid lines)
Tune
(solidlines)
lines)
Tune
Z1Z2*
(dashed
Tune Z1 (dashed lines)
0.5
2.4
2.9
"TransMIN"
"TransMAX"
"TransMIN"
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransMAX"
"TransMIN"
Divided by 300 GeV Value
Divided by 300 GeV Value
"TransMAX"
0.0
1.0
1.0
0.1
0.1
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
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
1.5
5.2
6.7
CDF Preliminary
Preliminary
CDF
CMS
solid
dots
CMS
solid
dots
CMS
solid
dots
CDF
solid
squares
CDF
solid
squares
CDF
solid
squares
corrected data
data
corrected
generator level
level theory
theory
generator
5.2
1.2
4.6
"TransMIN"
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
< PTmax
< 6.0
5.0 5.0
< PTmax
< 6.0
GeV/c
Tune Z2*GeV/c
(solid lines)
"TransMIN"
Tune
Z2* (solid
lines)
Tune
Z1 (dashed
lines)
"TransMAX"
Tune Z1
lines)
Divided
by(dashed
300 GeV
Value
3.1
0.6
2.8
Tune Z2* (solid lines)
"TransMIN"
"TransMAX"
Tune Z1 (dashed lines)
Divided by 300 GeV Value
1.0
0.0
0.1
0.1
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
1.0
1.0
1.0
10.0
100.0
10.0
10.0
Center-of-Mass
Energy
(GeV)
Center-of-Mass
Center-of-MassEnergy
Energy (GeV)
(GeV)
Center-of-Mass Energy (GeV)
 Corrected CDF data at 1.96 TeV, 900 GeV,
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum density
and 300 GeV on the charged particle density
in the “transMAX”, and the “transMIN”,
in the “transMAX”, and the “transMIN”,
regions as defined by the leading charged
regions as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
< 6 GeV/c. The data are plotted versus the
< 6 GeV/c. The data are plotted versus the
center-of-mass energy (log scale). The data
center-of-mass energy (log scale). The data
are compared with PYTHIA 6.4 Tune Z1
are compared with PYTHIA 6.4 Tune Z1
and Tune Z2*.
and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 31
“TransDIF/AVE” vs Ecm
"Transverse"
Charged
PTsum
Density:
dPT/dhdf
"Transverse"
Charged
PTsum
Density
Ratio
"Transverse"
"Transverse"Charged
ChargedParticle
ParticleDensity:
DensitydN/dhdf
Ratio
1.1
4.0
CDFPreliminary
Preliminary
CDF
CMSCMS
solidsolid
dotsdots
CMS
solid
dots
squares
CDFCDF
solidsolid
squares
CDF
solid
squares
correcteddata
data
corrected
generatorlevel
leveltheory
theory
generator
0.8
2.6
3.0
"TransAVE"
"TransAVE"
5.0Tune
< PTmax
< 6.0lines)
GeV/c
Z2* (solid
Tune Z2* (solid lines)
Tune
Z1
(dashed
Tune
Z1Z2*
(dashed
lines)
Tune
(solidlines)
lines)
"TransDIF"
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5 Divided by 300 GeV Value
1.8
2.0
Divided by 300 GeV Value
0.2
1.0
0.1
0.1
5.0<<PTmax
PTmax
6.0GeV/c
GeV/c
5.0
<<6.0
"TransDIF"
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
1.0
1.0
1.0
10.0
10.0
10.0
100.0
Particle
Density
Ratio
Charged
PTsum
Density
(GeV/c)
Particle Particle
Density Density
Ratio
Charged
1.1
3.4
4.0
CDF Preliminary
CDF
CDF Preliminary
Preliminary
correcteddata
data
corrected
corrected data
generatorlevel
leveltheory
theory
generator
generator level theory
CMS solid dots
CMS solid dots
CDF
CDFsolid
solidsquares
squares
0.8
3.0
0.5
2.0
Tune Z2* (solid lines)
Tune
Z2* (solid
lines)
5.0
< PTmax
< 6.0
GeV/c
Tune Z1 (dashed lines)
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1by
(dashed
lines)
Divided
300 GeV
Value
"TransDIF"
"TransDIF"
"TransAVE"
5.0 << PTmax
PTmax<<"TransDIF"
6.0GeV/c
GeV/c
5.0
6.0
Divided by 300 GeV Value
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
Charged Particles
(|h|<0.8, PT>0.5
GeV/c)
0.2
1.0
0.1
0.1
"TransAVE"
"TransAVE"
1.0
1.0
10.0
100.0
10.0
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass
Center-of-MassEnergy
Energy (GeV)
(GeV)
Center-of-Mass
Energy
(GeV)
Center-of-Mass
 Corrected CDF data at 1.96 TeV, 900 GeV,
 Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged PTsum density
and 300 GeV on the charged particle density
in the “transAVE”, and the “transDIF”,
in the “transAVE”, and the “transDIF”,
regions as defined by the leading charged
regions as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |h| < 0.8 with 5 < PTmax
< 6 GeV/c. The data are plotted versus the
< 6 GeV/c. The data are plotted versus the
center-of-mass energy (log scale). The data
center-of-mass energy (log scale). The data
are compared with PYTHIA 6.4 Tune Z1
are compared with PYTHIA 6.4 Tune Z1
and Tune Z2*.
and Tune Z2*.
The data are “normalized” by dividing by the corresponding value at 300 GeV.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 32
“TransMIN/DIF” vs Ecm
"Transverse" Charged PTsum Density Ratio
"Transverse"
"Transverse" Charged
Charged Particle
Particle Density
Density Ratio
Ratio
7.3
5.8
6.7
5.2
corrected
corrected data
data
generator
generator level
level theory
theory
4.8
3.8
CMS solid dots
CDF solid squares
Tune Z2*
(solid
CMS
solidlines)
dots
Tune CDF
Z1 (dashed
lines)
solid squares
5.0
5.0 << PTmax
PTmax << 6.0
6.0 GeV/c
GeV/c
Tune Z2* (solid lines)
Tune Z1by
(dashed
lines)
Divided
300 GeV
Value
"TransMIN"
"TransMIN"
"TransDIF"
2.9
2.4
Divided by 300 GeV Value
"TransDIF"
Particle Density
Density Ratio
Ratio
Particle
Particle Density Ratio
CDF
CDF Preliminary
Preliminary
CDF Preliminary
corrected
corrected data
data
generator
generator level
level theory
theory
5.2
4.2
CMS
CMSsolid
soliddots
dots
CDF
CDFsolid
solidsquares
squares
5.0 < PTmax < 6.0 GeV/c
"TransMIN"
"TransMIN"
5.0
< Z2*
PTmax
< 6.0
GeV/c
Tune
(solid
lines)
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
3.1
2.6
Divided by 300 GeV Value
Divided by 300 GeV Value
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransDIF"
Charged
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
The
“transMIN” (MPI-BBR 1.0
component) increases
1.0
0.1
1.0
10.0
100.0
1.0
10.0
100.0
0.1
1.0
10.0
1.0
10.0
much faster with center-of-mass
energy
Center-of-Mass
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass Energy
Energy (GeV)
(GeV)
than the “transDIF” (ISR-FSR component)!
 Ratio of CDF data at 1.96 TeV, 900 GeV, and
Duh!!
 Ratio of CDF data at 1.96 TeV, 900 GeV, and
300 GeV to the value at 300 GeV for the
300 GeV to the value at 300 GeV for the
charged particle density in the “transMIN”,
charged PTsum density in the “transMIN”,
and “transDIF” regions as defined by the
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
charged particles with pT > 0.5 GeV/c and
|h| < 0.8 with 5 < PTmax < 6 GeV/c. The
|h| < 0.8 with 5 < PTmax < 6 GeV/c. The
data are plotted versus the center-of-mass
data are plotted versus the center-of-mass
energy (log scale). The data are compared
energy (log scale). The data are compared
with PYTHIA 6.4 Tune Z1 and Tune Z2*.
with PYTHIA 6.4 Tune Z1 and Tune Z2*.
1.0
1.0
0.1
0.1
The data are “normalized” by dividing by the corresponding value at 300 GeV.
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 33
“Tevatron” to the LHC
"TransAVE"
Density: dN/dhdf
dN/dhdf
"TransAVE" Charged Particle Density:
CMS
1.5
RDFPreliminary
Preliminary
RDF
13 TeV Predicted
CorrectedData
Data
Corrected
Generator
Level Theory
Tune Z2* Generator
Level
ChargedParticle
ParticleDensity
Density
Charged
7 TeV
1.0
1.0
1.96 TeV
1.96 TeV
900 GeV
CDF
0.5
0.5
CDF
900 GeV
300 GeV
300 GeV
CDF
Tune Z2*
0.0
0.0
0
0
5
5
10
10
Tune Z2* (solid lines)
Tune 4C (dashed lines)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
15
15
20
20
25
25
30
30
PTmax
(GeV/c)
PTmax (GeV/c)
PYTHIA 8 Tune 4C (dashed lines) - Corke & Sjöstrand
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 34
“Tevatron” to the LHC
"TransAVE" Charged
"Transverse"
ChargedPTsum
PTsumDensity:
Density:dPT/dhdf
dPT/dhdf
1.8
1.8
RDF
RDFPreliminary
Preliminary
PTsum Density
Density (GeV/c)
PTsum
(GeV/c)
Corrected
Data
Corrected
Data
Generator
Level Theory
Tune Z2* Generator
Level
CMS
13
13 TeV
TeV Predicted
Predicted
77 TeV
TeV
1.2
1.2
CDF
1.96 TeV
TeV
1.96
0.6
0.6
900 GeV
GeV
900
300 GeV
GeV
300
Tune Z2*
0.0
0.0
00
55
10
10
CDF
Tune Z2* (solid lines)
CDF
Tune 4C (dashed lines)
ChargedParticles
Particles(|h|<0.8,
(|h|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
15
15
20
20
25
25
30
30
PTmax (GeV/c)
(GeV/c)
PTmax
PYTHIA 8 Tune 4C (dashed lines) - Corke & Sjöstrand
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 35
Summary & Conclusions
 The “transverse” density increases faster with center-of-mass energy
than the overall density (Nchg ≥ 1)! However, the “transverse” =
“transAVE” region is not a true measure of the energy dependence of
MPI since it receives large contributions from ISR and FSR.
What wecomponent)
are learning
should
 The “transMIN” (MPI-BBR
increases
much faster with
allow
forthan
a deeper
understanding
ofcomponent)!
MPI
center-of-mass
energy
the “transDIF”
(ISR-FSR
Previously we only
knew will
the energy
of “transAVE”.
which
resultdependence
in more precise
atMB
the future
We now predictions
have at lot of
& UE data at
energy
13 TeV!
300 GeV, LHC
900 GeV,
1.96ofTeV,
and 7 TeV!
We can study the energy dependence
more precisely than ever before!
 Both PYTHIA 6.4 Tune Z1 (CTEQ5L) and PYTHIA 6.4 Tune Z2*
(CTEQ6L) go a fairly good job (although not perefct) in describing the
energy deperdence of the UE!
ISMD 2013 Chicago
September 17, 2013
Rick Field – Florida/CDF/CMS
Page 36