EPS-HEP 2013
Energy Dependence of the
“Underlying Event”
Rick Field
University of Florida
Stockholm, Sweden, July 2013
Outline of Talk
Outgoing Parton
PT(hard)
New CDF UE data from the Tevatron
Energy Scan (R. Field).
Initial-State Radiation
Proton
AntiProton
Underlying Event
New CMS UE data (M. Zakaria).
Outgoing Parton
Underlying Event
Final-State
Radiation
Comparisons with PYTHIA 6.4 Tune Z1
and PYTHIA 6.4 Tune Z2*.
Mapping out the energy dependence of
the UE: Tevatron to the LHC!
Summary & Conclusions.
EPS-HEP 2013
Stockholm, July 19, 2013
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
Tevatron Energy Scan
Proton
CDF
1 mile
AntiProton
Proton
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
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 2
UE Observables
“Transverse” Charged Particle Density: Number of charged
particles (pT > 0.5 GeV/c, |η
η| < ηcut) in the “transverse” region as
defined by the leading charged particle, PTmax, divided by the
area in η-φ
φ space, 2η
ηcut×2π
π/3, averaged over all events with at least
one particle with pT > 0.5 GeV/c, |η
η| < ηcut.
“Transverse” Charged PTsum Density: Scalar pT sum of the
charged particles (pT > 0.5 GeV/c, |η
η| < ηcut) in the “transverse”
region as defined by the leading charged particle, PTmax, divided
by the area in η-φ
φ space, 2η
ηcut×2π
π/3, averaged over all events with
η| < ηcut.
at least one particle with pT > 0.5 GeV/c, |η
PTmax Direction
∆φ
“Toward”
“Transverse”
“Transverse”
“Away”
“Transverse” Charged Particle Average PT: Event-by-event <pT> = PTsum/Nchg for charged
η| < ηcut) in the “transverse” region as defined by the leading
particles (pT > 0.5 GeV/c, |η
charged particle, PTmax, averaged over all events with at least one particle in the
“transverse” region with pT > 0.5 GeV/c, |η
η| < ηcut.
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
η| < ηcut. However, if there are no
events with at least one particle with pT > 0.5 GeV/c, |η
charged particles in the “transverse” region then the event is not used in constructing the
“transverse” average pT.
ηcut = 1.0 and ηcut = 0.8
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 3
UE Observables
“transMAX” and “transMIN” Charged Particle Density: Number
PTmax Direction
of charged particles (pT > 0.5 GeV/c, |η
η| < 0.8) in the the maximum
∆φ
(minimum) of the two “transverse” regions as defined by the
leading charged particle, PTmax, divided by the area in η-φ
φ space,
“Toward”
2η
ηcut×2π
π/6, averaged over all events with at least one particle with
pT > 0.5 GeV/c, |η
η| < ηcut.
“TransMAX”
“TransMIN”
“transMAX” and “transMIN” Charged PTsum Density: Scalar pT
sum of charged particles (pT > 0.5 GeV/c, |η
η| < 0.8) in the the
“Away”
maximum (minimum) of the two “transverse” regions as defined
by the leading charged particle, PTmax, divided by the area in η-φ
φ
π/6, averaged over all events with at least one particle
space, 2η
ηcut×2π
with pT > 0.5 GeV/c, |η
η| < ηcut.
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
ηcut = 0.8
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 4
“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
∆φ
“Toward”
“TransMAX”
“TransMIN”
“Away”
“Away-Side” Jet
“TransDIF” density more sensitive to ISR & FSR.
0 ≤ “TransDIF” ≤ 2×”TransAVE”
“TransDIF” = “TransAVE” if “TransMIX” = 3×”TransMIN”
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 5
“transMIN” & “transDIF”
PTmax Direction
Question:
Do you
expect
the energy
dependence
of thethe
“transMIN”
The
“toward”
region
contains
the leading
“jet”, while
“away” and “transDIF”
region,
contains
the “away-side”
“jet”.
The
densitiesontothe
be average,
the same?
Or do you
expect that one
of the
two densities will increase
“transverse”
region is energy
perpendicular
the plane
of the
faster with increasing
than thetoother?
Which
onehard
and 2-to-2
why?
“Toward-Side” Jet
scattering and is very sensitive to the “underlying event”. For
events with large initial or final-state radiation the “transMAX”
∆φ
region defined contains the third jet while both the “transMAX”
“Toward”
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
“TransMAX”
“TransMIN”
remnants (BBR), while the “transMAX” minus the “transMIN”
(i.e. “transDIF”) is very sensitive to initial-state radiation (ISR) Jet #3
“Away”
and final-state radiation (FSR).
“TransMIN” density more sensitive to MPI & BBR.
“Away-Side” Jet
“TransDIF” density more sensitive to ISR & FSR.
0 ≤ “TransDIF” ≤ 2×”TransAVE”
“TransDIF” = “TransAVE” if “TransMIX” = 3×”TransMIN”
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 6
PTmax UE Data
CDF PTmax UE Analysis: “transMAX”, “transMIN”,
“transAVE”, and “transDIF” charged particle and PTsum
η| < 0.8) in proton-antiproton collisions
densities (pT > 0.5 GeV/c, |η
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, |η
η| < 0.8) in proton-proton collisions at
900 GeV and 7 TeV (M. Zakaria analysis).
PTmax Direction
∆φ
“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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 7
“transMAX/MIN” NchgDen
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
1.2
CDF Preliminary
"Transverse" Charged Density
"Transverse" Charged Density
1.5
1.96 TeV
Corrected Data
"TransMAX"
1.0
0.5
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
CDF Preliminary
Corrected Data
900 GeV
"TransMAX"
0.8
0.4
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0
4
8
12
16
20
0
4
8
PTmax (GeV/c)
12
16
20
PTmax (GeV/c)
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
0.72
"Transverse" Charged Density
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
|η
η| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
CDF Preliminary
300 GeV
corrected data
"TransMAX"
0.48
0.24
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.00
0
2
4
6
8
10
12
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 8
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“transMAX/MIN” NchgDen
ηdφ
φ
"Transverse" Charged
Charged Particle Density:
Density: dN/dη
dN/dη
"Transverse"
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
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
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 (|η
η|<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 (|η
|<0.8, PT>0.5 GeV/c)
η|<0.8,
Charged Particles (|η
PT>0.5 GeV/c)
η
0.0
00
44
88
12
12
16
16
20
20
0
4
8
PTmax (GeV/c)
(GeV/c)
PTmax
16
20
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
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
|η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
12
PTmax (GeV/c)
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 (|η
(|η
|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
ηη|<0.8,
0.00
0
Rick Field – Florida/CDF/CMS
2
4
6
8
10
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PTmax (GeV/c)
Page 9
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“transDIF/AVE” NchgDen
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
0.9
0.9
Corrected Data
CDF Preliminary
"TransDIF"
Charged Particle Density
Charged Particle Density
CDF Preliminary
0.6
"TransAVE"
0.3
1.96 TeV
Corrected Data
"TransDIF"
0.6
"TransAVE"
0.3
900 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
4
8
12
16
0
20
4
8
12
16
20
PTmax (GeV/c)
PTmax (GeV/c)
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
0.6
CDF Preliminary
Charged Particle Density
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 |η
η| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
Corrected Data
"TransDIF"
0.4
"TransAVE"
0.2
300 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0
2
4
6
8
10
12
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 10
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“transDIF/AVE” NchgDen
η
φφ
"Transverse"
ηdφ
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dη
dN/dη
dφ
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
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 (|η
η |<0.8, PT>0.5 GeV/c)
Charged
ηη|<0.8,
Charged Particles
Particles (|η
(|η
|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
0.0
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)
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
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 |η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 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 (|η
η
η|<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 11
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“transMAX/MIN” NchgDen
ηdφ
φ
"TransMIN" Charged Particle Density: dN/dη
ηdφ
φ
"TransMAX" Charged Particle Density: dN/dη
0.39
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
1.96 TeV
Corrected Data
0.26
900 GeV
0.13
300 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.00
0.0
0
4
8
12
16
0
20
4
8
12
16
PTmax (GeV/c)
PTmax (GeV/c)
ηdφ
φ
"TransDIF" Charged Particle Density: dN/dη
0.8
CDF Preliminary
Charged Particle Density
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
|η
η| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
1.96 TeV
Corrected Data
0.6
900 GeV
0.4
300 GeV
0.2
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0
4
8
12
16
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
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Rick Field – Florida/CDF/CMS
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“transMAX/MIN” NchgDen
ηdφ
φ
"TransMIN" Charged Particle Density: dN/dη
"TransMIN"
"TransMAX" Charged
Charged Particle
Particle Density:
Density: dN/dη
dN/dη
dφ
ηηdφ
φφ
"TransMAX"
0.39
0.39
CDF
CDFPreliminary
Preliminary
1.96 TeV
Corrected Data
Corrected Data
Generator Level Teory
1.96 TeV
Charged
Charged Particle
Particle Density
Density
Charged Particle
Density
"TransMAX"
Charged
Density
1.2
1.2
0.8
0.8
900 900
GeVGeV
300 GeV
0.4
0.4
300 GeV
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
|<0.8,
ηη
0.0
0.0
00
44
88
12
12
16
16
CDF Preliminary
1.96 TeV
0.26
0.26
900 GeV
900 GeV
0.13
0.13
300
GeV
Tune
Z2* (solid lines)
300 GeV
0.00
0.00
00
20
20
Tune Z1 (dashed lines)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
44
88
12
12
16
16
20
20
PTmax (GeV/c)
(GeV/c)
PTmax
PTmax (GeV/c)
(GeV/c)
PTmax
ηηdφ
φφ
"TransDIF"
"TransDIF" Charged
Charged Particle
Particle Density:
Density: dN/dη
dN/dη
dφ
0.9
0.8
CDF
CDFPreliminary
Preliminary
Charged Particle
Particle Density
Density
Charged
Corrected CDF data at 1.96 TeV, 900 GeV,
and 300 GeV on the charged particle
density in the “transMAX”, “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
1.96 TeV
Corrected Data
Generator Level Theory
0.6
0.6
1.961.96
TeVTeV
Corrected
CorrectedData
Data
Generator Level Theory
900
GeV
900
GeV
0.4
300 GeV
300 GeV
0.3
0.2
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged
|<0.8,
ηη
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.0
0.0
00
Rick Field – Florida/CDF/CMS
44
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12
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PTmax
PTmax (GeV/c)
(GeV/c)
Page 13
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“transMAX/MIN” PTsumDen
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
1.2
1.5
Corrected Data
1.96 TeV
CDF Preliminary
"TransMAX"
Corrected Data
PTsum Density (GeV/c)
PTsum Density (GeV/c)
CDF Preliminary
1.0
0.5
"TransMIN"
900 GeV
"TransMAX"
0.8
0.4
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
4
8
12
16
0
20
4
8
12
16
20
PTmax (GeV/c)
PTmax (GeV/c)
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
0.72
CDF Preliminary
300 GeV
Corrected Data
PTsum Density (GeV/c)
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
|η
η| < 0.8. The data are corrected to the
particle level with errors that include both
the statistical error and the systematic
uncertainty.
"TransMAX"
0.48
0.24
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.00
0
2
4
6
8
10
12
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 14
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“transMAX/MIN” PTsumDen
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
ηdφφ
"Transverse" Charged PTsum Density: dPT/dη
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 (|η
η |<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
4
8
12
16
0
20
4
8
16
20
PTmax (GeV/c)
PTmax (GeV/c)
ηdφ
φφ
"Transverse" Charged PTsum Density: dPT/dη
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
|η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
12
300 GeV
CorrectedData
Data
Corrected
Generator Level Theory
"TransMAX"
0.48
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.24
"TransMIN"
Charged
ηη|<0.8,
Charged Particles
Particles (|η
(|η
|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
0.00
0
2
Rick Field – Florida/CDF/CMS
44
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8
10
10
12
12
PTmax (GeV/c)
Page 15
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“transDIF/AVE” PTsumDen
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
0.9
1.2
CDF Preliminary
Corrected Data
Corrected Data
PTsum Density (GeV/c)
PTsum Density (GeV/c)
CDF Preliminary
"TransDIF"
0.8
"TransAVE"
0.4
1.96 TeV
"TransDIF"
0.6
"TransAVE"
0.3
900 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
4
8
12
16
0
20
4
8
12
16
20
PTmax (GeV/c)
PTmax (GeV/c)
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
0.6
CDF Preliminary
PTsum Density (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 |η
η| < 0.8. The data
are corrected to the particle level with
errors that include both the statistical
error and the systematic uncertainty.
Corrected Data
"TransDIF"
0.4
"TransAVE"
0.2
300 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0
2
4
6
8
10
12
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 16
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“transDIF/AVE” PTsumDen
Charged PTsum
PTsum Density:
Density: dPT/dη
dPT/dη
dφ
ηηdφ
φφ
"Transverse" Charged
ηηdφ
φφ
"Transverse" Charged
Charged PTsum
PTsum Density:
Density: dPT/dη
dPT/dη
dφ
"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
ηη|<0.8,
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged Particles
Particles (|η
(|η
|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
ηη|<0.8,
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
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
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 |η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 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 (|η
η |<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 17
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“TransAVE” Density
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
ηdφ
φ
"TransAVE" Charged Particle Density: dN/dη
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 (|η
η|<0.8, PT>0.5 GeV/c)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Charged Particles (|η
η|<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 |η
η| < 0.8. The data are
pT > 0.5 GeV/c and |η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 18
“transMAX” NchgDen vs Ecm
ηdφ
φ
"TransMAX" Charged Particle Density: dN/dη
ηdφ
φ
"TransMAX" Charged Particle Density: dN/dη
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 (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<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 |η
η| < 0.8. The data are
corrected to the particle level with errors
that include both the statistical error and
the systematic uncertainty.
EPS-HEP 2013
Stockholm, July 19, 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 |η
η| < 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 19
“TransMAX/MIN” vs Ecm
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
1.8
Charged Particle Density
CDF Preliminary
corrected data
generator level theory
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"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0.1
1.0
Charged PTsum Density (GeV/c)
1.5
CDF Preliminary
1.2
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.6
"TransMIN"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
10.0
CMS solid dots
CDF solid squares
corrected data
generator level theory
0.1
Center-of-Mass Energy (GeV)
1.0
10.0
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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 20
“TransMAX/MIN” vs Ecm
"Transverse"
Charged
Particle
DensitydN/dη
Ratio
ηdφ
φ
"Transverse"
Charged
Particle
Density:
ηdφ
φ
"Transverse"
Charged
PTsum
Density:
dPT/dη
"Transverse"
Charged
PTsum
Density
Ratio
Charged
ParticleParticle
DensityDensity
Ratio
CDFPreliminary
Preliminary
CDF
correcteddata
data
corrected
generatorlevel
leveltheory
theory
generator
1.0
3.8
1.8
6.4
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
"TransMAX"
5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
"TransMIN"
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
2.4
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransMIN"
Divided by 300 GeV Value
"TransMAX"
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
|<0.8,
ηη
0.0
1.0
0.1
1.0
10.0
Charged
PTsum
Density
(GeV/c)
Particle
Density
Ratio
1.5
5.2
CDF Preliminary
Preliminary
CDF
corrected data
corrected data
generator level theory
generator level theory
1.2
4.6
CMS
solid
dots
CMS
solid
dots
CDF
solid
squares
CDF
solid
squares
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
5.0 < PTmax < 6.0 GeV/c
"TransMIN"
Tune Z2* (solid lines)
Tune
Z2* (solid
lines)
Tune
Z1 (dashed
lines)
Tune Z1 (dashed lines)
0.6
2.8
"TransMIN"
Divided by 300 GeV Value
0.0
1.0
0.1
0.1
Center-of-Mass Energy (GeV)
"TransMAX"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
1.0
1.0
10.0
10.0
Center-of-Mass
Center-of-MassEnergy
Energy (GeV)
(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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 21
“TransMAX/MIN” vs Ecm
"Transverse"
Charged
Particle
Density
Ratio
ηdφ
φ
"Transverse"
Charged
Particle
Density:
"Transverse"
Charged
Particle
DensitydN/dη
Ratio
CDF
Preliminary
CDF
CDFPreliminary
Preliminary
corrected
data
corrected
data
corrected
data
generator
level
theory
generator
level
theory
generator
level
theory
1.0
3.8
4.8
7.3
1.8
6.4
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
5.0 < PTmax < 6.0 GeV/c
5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
Tune Z2* (solid lines)
Tune
(solidlines)
lines)
Tune
Z1Z2*
(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(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
|<0.8,
ηη
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
"Transverse"
Charged
PTsum
Density
Ratio
ηdφ
φ
"Transverse"
Charged
PTsum
Density:
dPT/dη
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
"TransMIN"
Tune Z2* (solid lines)
"TransMAX"
Tune Z1 (dashed lines)
Divided by 300 GeV Value
1.0
0.0
0.1
0.1
Charged
ηη|<0.8,
ChargedParticles
Particles(|η
(|η
|<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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 22
“TransDIF/AVE” vs Ecm
ηdφ
φ
"Transverse" Charged PTsum Density: dPT/dη
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
1.1
Charged Particle Density
CDF Preliminary
CMS solid dots
CDF solid squares
corrected data
generator level theory
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged PTsum Density (GeV/c)
1.1
CDF Preliminary
CMS solid dots
CDF solid squares
corrected data
generator level theory
0.8
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5
5.0 < PTmax < 6.0 GeV/c
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.2
0.2
0.1
1.0
10.0
0.1
1.0
10.0
Center-of-Mass Energy (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 “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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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*.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 23
“TransDIF/AVE” vs Ecm
ηdφ
φ
"Transverse"
Charged
PTsum
Density:
dPT/dη
"Transverse"
Charged
PTsum
Density
Ratio
ηdφ
φ
"Transverse"
"Transverse"Charged
ChargedParticle
ParticleDensity:
DensitydN/dη
Ratio
CDF Preliminary
Preliminary
CDF
correcteddata
data
corrected
generatorlevel
leveltheory
theory
generator
0.8
2.6
1.1
4.0
CMSCMS
solidsolid
dotsdots
squares
CDFCDF
solidsolid
squares
"TransAVE"
5.0 < PTmax < 6.0 GeV/c
Tune Z2* (solid lines)
Tune
Z1Z2*
(dashed
Tune
(solid lines)
lines)
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5
1.8
Divided by 300 GeV Value
5.0 < PTmax
< 6.0 GeV/c
"TransDIF"
Charged Particles (|η
PT>0.5 GeV/c)
ηη|<0.8,
Charged Particles (|η
|<0.8, PT>0.5 GeV/c)
0.2
1.0
0.1
0.1
1.0
1.0
10.0
10.0
Particle
Density
Ratio
Charged
PTsum
Density
(GeV/c)
Particle Particle
Density Density
Ratio
Charged
1.1
3.4
CDF Preliminary
CDF Preliminary
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
corrected data
corrected data
generator level theory
generator level theory
0.8
3.0
Tune
Z2* (solid
lines)
5.0
< PTmax
< 6.0
GeV/c
"TransDIF"
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
0.5
2.0
"TransAVE"
"TransAVE"
5.0 < PTmax <"TransDIF"
6.0 GeV/c
Divided by 300 GeV Value
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.2
1.0
0.1
1.0
10.0
Center-of-Mass Energy (GeV)
Center-of-Mass Energy
Energy (GeV)
(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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 24
“TransDIF/AVE” vs Ecm
φ
"Transverse"
Charged
PTsum
Density:
dPT/dη
"Transverse"
Charged
PTsum
Density
Ratioηdφ
ηdφ
φ
"Transverse"
"Transverse"Charged
ChargedParticle
ParticleDensity:
DensitydN/dη
Ratio
CDFPreliminary
Preliminary
CDF
correcteddata
data
corrected
generatorlevel
leveltheory
theory
generator
0.8
2.6
3.0
1.1
4.0
CMSCMS
solidsolid
dotsdots
CMS
solid
dots
squares
CDFCDF
solidsolid
squares
CDF
solid
squares
"TransAVE"
"TransAVE"
5.0Tune
< PTmax
< 6.0lines)
GeV/c
Z2* (solid
Tune Z2* (solid lines)
Tune
Z1
(dashed
Tune
Z1Z2*
(dashed
lines)
Tune
(solidlines)
lines)
"TransDIF"
Tune Z1 (dashed lines)
"TransDIF"
"TransAVE"
0.5 Divided by 300 GeV Value
1.8
2.0
Divided by 300 GeV Value
0.2
1.0
0.1
0.1
5.0<<PTmax
PTmax
6.0GeV/c
GeV/c
5.0
<<6.0
"TransDIF"
Charged Particles (|η
PT>0.5 GeV/c)
η|<0.8,
Charged Particles
Particles (|η
(|η
|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
ηη|<0.8,
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
CMSsolid
soliddots
dots
CDF
solid
CDF 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
0.2
1.0
0.1
0.1
"TransAVE"
"TransAVE"
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
η|<0.8,
Charged
η(|η
Charged Particles
PT>0.5 GeV/c)
η|<0.8,
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 |η
η| < 0.8 with 5 < PTmax
pT > 0.5 GeV/c and |η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 25
“TransAVE” vs Ecm
ηdφ
φ
"TransAVE"
Charged
Particle
DensitydN/dη
Ratio
"TransAVE"
Charged
Particle
Density:
ηdφ
φ
"TransAVE"
Charged
PTsum
Density:
dPT/dη
"TransAVE"
Charged
PTsum
Density
Ratio
1.1
3.4
corrected data
generator level theory
1.1
4.0
CMS
solid
dotsdots
CMS
solid
CDFCDF
solid
squares
solid
squares
0.8
2.6
Tune Z2* (solid lines)
Tune
Z1 Z2*
(dashed
Tune
(solidlines)
lines)
Tune Z1 (dashed lines)
0.5
1.8
Divided by 300 GeV Value
5.0<<PTmax
PTmax<<6.0
6.0GeV/c
GeV/c
5.0
Charged
ηη|<0.8,
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
0.2
1.0
0.1
1.0
10.0
Charged
PTsum
Density
(GeV/c)
Particle
Density
Ratio
Charged
ParticleParticle
DensityDensity
Ratio
RDF Preliminary
RDF
RDF Preliminary
Preliminary
CMS solid dots
CMS solid dots
CDF solid squares
CDF solid squares
corrected data
corrected data
generator level theory
generator level theory
0.8
3.0
Tune Z2* (solid lines)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
Tune Z1 (dashed lines)
0.5
2.0
5.0 < PTmax < 6.0 GeV/c
5.0 < PTmax < 6.0 GeV/c
Divided by 300 GeV Value
0.2
1.0
0.1
0.1
Center-of-Mass Energy (GeV)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
1.0
1.0
10.0
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
|η
η| < 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
|η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 26
“TransAVE” vs Ecm
ηdφ
φ
"TransAVE"
Charged
Particle
Density
Ratio
"TransAVE"
Charged
Particle
Density:
dN/dη
"TransAVE"
Charged
Particle
Density
Ratio
ηdφ
φ
"TransAVE"
Charged
PTsum
Density:
dPT/dη
"TransAVE"
Charged
PTsum
Density
Ratio
"TransAVE"
Charged
PTsum
Density
Ratio
1.1
3.4
4.3
corrected
corrected data
data
generator
generatorlevel
leveltheory
theory
0.8
2.6
3.2
1.1
4.0
4.0
CMS
solid
dotsdots
CMS
solid
CMS
CDF
solid
squares
CDF
CDF
solid
squares
Tune Z2* (solid lines)
TuneZ1
Z2*(dashed
(solid lines)
Tune
lines)
Tune
Z1 Z2*
(dashed
Tune
(solidlines)
lines)
Tune Z1 (dashed lines)
Divided by 300 GeV Value
0.5
1.8
2.1
Divided by 300 GeV Value
0.2
1.0
1.0
0.1
0.1
5.0
<PTmax
PTmax
<6.0
6.0
GeV/c
5.0
GeV/c
5.0
< <PTmax
< <6.0
GeV/c
Charged
|<0.8,
ηηη
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
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
RDF
RDF Preliminary
Preliminary
RDF
RDF Preliminary
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
0.2
1.0
1.0
0.1
0.1
0.1
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
Charged
Particles (|η
PT>0.5 GeV/c)
ηη|<0.8,
Charged
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
η|<0.8,
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
|η
η| < 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
|η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 27
“TransMIN/DIF” vs Ecm
"Transverse" Charged PTsum Density Ratio
"Transverse" Charged Particle Density Ratio
5.8
5.2
CDF Preliminary
CMS solid dots
CDF solid squares
corrected data
generator level theory
Particle Density Ratio
Particle Density Ratio
CDF Preliminary
3.8
5.0 < PTmax < 6.0 GeV/c
"TransMIN"
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransDIF"
2.4
Divided by 300 GeV Value
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
1.0
0.1
1.0
10.0
CMS solid dots
CDF solid squares
corrected data
generator level theory
"TransMIN"
4.2
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 (|η
η|<0.8, PT>0.5 GeV/c)
1.0
0.1
1.0
10.0
Center-of-Mass Energy (GeV)
Center-of-Mass Energy (GeV)
Ratio of CDF data at 1.96 TeV, 900 GeV,
and 300 GeV to the value at 300 GeV for the
charged particle density in the “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|η
η| < 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*.
Ratio of CDF data at 1.96 TeV, 900 GeV,
and 300 GeV to the value at 300 GeV for the
charged PTsum density in the “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 28
“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
"TransMIN"
5.0
5.0 << PTmax
PTmax << 6.0
6.0 GeV/c
GeV/c
"TransMIN"
Tune Z2* (solid lines)
Tune Z1by
(dashed
lines)
Divided
300 GeV
Value
"TransDIF"
2.9
2.4
Divided by 300 GeV Value
1.0
1.0
0.1
0.1
"TransDIF"
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
1.0
1.0
CDF Preliminary
Preliminary
CMS solid dots
CDF solid squares
Tune Z2*
(solid
CMS
solidlines)
dots
Tune CDF
Z1 (dashed
lines)
solid squares
Particle Density
Density Ratio
Ratio
Particle
Particle Density Ratio
CDF
CDF Preliminary
Preliminary
10.0
100.0
10.0
CMS
CMS solid
solid dots
dots
CDF
CDFsolid
solidsquares
squares
corrected
corrected data
data
generator
generator level
level theory
theory
3.1
2.6
"TransMIN"
"TransMIN"
5.0 < PTmax < 6.0 GeV/c
5.2
4.2
5.0
< Z2*
PTmax
< 6.0
GeV/c
Tune
(solid
lines)
Tune Z1 (dashed lines)
Tune Z2* (solid lines)
Tune Z1 (dashed lines)
"TransDIF"
"TransDIF"
Divided by 300 GeV Value
Divided by 300 GeV Value
Charged
ηη|<0.8,
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
1.0
1.0
0.1
0.1
1.0
1.0
10.0
100.0
10.0
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass
Center-of-Mass Energy
Energy (GeV)
(GeV)
Ratio of CDF data at 1.96 TeV, 900 GeV,
and 300 GeV to the value at 300 GeV for the
charged particle density in the “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|η
η| < 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*.
Ratio of CDF data at 1.96 TeV, 900 GeV,
and 300 GeV to the value at 300 GeV for the
charged PTsum density in the “transMIN”,
and “transDIF” regions as defined by the
leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and
|η
η| < 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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 29
“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
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
CDF Preliminary
Preliminary
CMS solid dots
CDF solid squares
Tune Z2*
(solid
CMS
solidlines)
dots
Tune CDF
Z1 (dashed
lines)
solid squares
"TransDIF"
Particle Density
Density Ratio
Ratio
Particle
Particle Density Ratio
CDF
CDF Preliminary
Preliminary
corrected
corrected data
data
generator
generator level
level theory
theory
5.2
4.2
3.1
2.6
CMS
CMS solid
solid dots
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)
Divided by 300 GeV Value
Divided by 300 GeV Value
"TransDIF"
"TransDIF"
Charged
ηη|<0.8,
ChargedParticles
Particles(|η
(|η
|<0.8,PT>0.5
PT>0.5GeV/c)
GeV/c)
Answer to Question
1.0
1.0
The
(MPI-BBR
component)
increases
0.1
1.0
10.0
100.0
1.0
10.0
100.0
0.1
1.0
10.0
1.0 “transMIN”
10.0
Center-of-Mass
Center-of-Mass
(GeV)
Center-of-Mass Energy
Energy (GeV)
(GeV)
Center-of-Mass Energy
Energy
(GeV)faster with center-of-mass energy
much
than
the900
“transDIF”
(ISR-FSR component)!
Ratio of CDF data at 1.96
TeV,
GeV,
Ratio of CDF data at 1.96 TeV, 900 GeV,
Duh!!
and 300 GeV to the value at 300 GeV for the
and 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
|η
η| < 0.8 with 5 < PTmax < 6 GeV/c. The
|η
η| < 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*.
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
1.0
1.0
0.1
0.1
The data are “normalized” by dividing by the corresponding value at 300 GeV.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 30
“Tevatron” to the LHC
"TransAVE" Charged Particle Density: dN/dη
ηdφ
φ
CMS
1.5
RDF Preliminary
13 TeV Predicted
Corrected Data
Tune Z2* Generator Level
Charged Particle Density
7 TeV
1.0
1.96 TeV
CDF
900 GeV
0.5
CDF
300 GeV
CDF
Tune Z2*
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.0
0
5
10
15
20
25
30
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 31
“Tevatron” to the LHC
"Transverse" Charged PTsum Density: dPT/dη
ηdφ
φ
1.8
RDF Preliminary
PTsum Density (GeV/c)
Corrected Data
Tune Z2* Generator Level
CMS
13 TeV Predicted
7 TeV
1.2
CDF
1.96 TeV
0.6
900 GeV
300 GeV
Tune Z2*
0.0
0
5
10
CDF
CDF
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
15
20
25
30
PTmax (GeV/c)
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 32
LHC
CDF
CDF versus
versus CMS
ηdφ
φ
"TransAVE" Charged Particle Density: dN/dη
ηdφ
φ
"TransAVE" Charged PTsum Density: dPT/dη
0.75
0.78
RDF Preliminary
corrected data
CDF
PTsum Density (GeV/c)
Charged Particle Density
RDF Preliminary
0.50
0.25
CMS
900 GeV
CDF
corrected data
0.52
0.26
CMS
900 GeV
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
0.00
0.00
0
4
8
12
16
20
0
PTmax (GeV/c)
4
8
12
16
20
PTmax (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 |η
η| < 0.8. The data are
η| < 0.8. The data are
pT > 0.5 GeV/c and |η
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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 33
LHC
CDF
CDF versus
versus CMS
ηdφ
φ
"TransAVE" Charged Particle Density: dN/dη
ηηdφ
φφ
"TransAVE"
"TransAVE" Charged
Charged PTsum
PTsum Density:
Density: dPT/dη
dPT/dη
dφ
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(|η
PT>0.5
GeV/c)
η|<0.8,
Charged
|<0.8,
PT>0.5
GeV/c)
η(|η
Charged Particles (|η
η|<0.8, PT>0.5 GeV/c)
Charged Particles (|η
η|<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 |η
η| < 0.8. The data are
η| < 0.8. The data are
pT > 0.5 GeV/c and |η
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.
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 34
20
20
Summary & Conclusions
The “transverse” 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
center-of-mass energy than the “transDIF” (ISR-FSR component)!
Previously we only knew the energy dependence of “transAVE”.
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!
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!
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 35
Summary & Conclusions
The “transverse” 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
What
learning
should component)!
center-of-mass energy
thanwe
theare
“transDIF”
(ISR-FSR
Previously we
only for
knew
energy
dependence of “transAVE”.
allow
a the
deeper
understanding
of MPI
which will result in more precise
We now predictions
have at lot of
& UE data at
atMB
the future
300 GeV, LHC
900 GeV,
1.96ofTeV,
and 7 TeV!
energy
13 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!
EPS-HEP 2013
Stockholm, July 19, 2013
Rick Field – Florida/CDF/CMS
Page 36