cosmic qcd 2013
DESCRIPTION
Cosmic QCD 2013. Energy Dependence of the “Underlying Event”. Rick Field University of Florida. Outline of Talk. New CDF UE data from the Tevatron Energy Scan. Comparisons with PYTHIA 6.4 Tune Z1. New CMS UE data. Mapping out the energy dependence: Tevatron to the LHC !. - PowerPoint PPT PresentationTRANSCRIPT
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 1
Rick FieldUniversity of Florida
Outline of Talk
CMS at the LHCCDF Run 2
300 GeV, 900 GeV, 1.96 TeV 900 GeV, 7 & 8 TeV
Cosmic QCD 2013Cosmic QCD 2013
New CDF UE data from the Tevatron Energy Scan.
New CMS UE data.
Comparisons with PYTHIA 6.4 Tune Z1.
New UE-MB comparisons!
Summary & Conclusions.
Energy Dependence of the “Underlying Event”
Proton AntiProton
PT(hard)
Outgoing Parton
Outgoing Parton
Underlying Event Underlying Event
Initial-State Radiation
Final-State Radiation
Mapping out the energy dependence: Tevatron to the LHC!
New CDF MB data.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 2
Tevatron Energy ScanTevatron Energy Scan
Just before the shutdown of the Tevatron CDF has collected more than 10M “min-bias” events at several center-of-mass energies!
Proton
AntiProton
1 mile CDF
Proton AntiProton 1.96 TeV300 GeV
300 GeV 12.1M MB Events
900 GeV 54.3M MB Events
900 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 3
UE ObservablesUE Observables “Transverse” Charged Particle Density: Number of charged particles
(pT > 0.5 GeV/c, || < cut) in the “transverse” region as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
PTmax Direction
“Toward”
“Transverse” “Transverse”
“Away”
“Transverse” Charged PTsum Density: Scalar pT sum of the charged particles (pT > 0.5 GeV/c, || < cut) in the “transverse” region as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
“Transverse” Charged Particle Average PT: Event-by-event <pT> = PTsum/Nchg for charged particles (pT > 0.5 GeV/c, || < cut) 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, || < cut.
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, || < cut. However, if there are no charged particles in the “transverse” region then the event is not used in constructing the “transverse” average pT.
cut = 1.0 and cut = 0.8
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 4
UE ObservablesUE Observables “Toward” Charged Particle Density: Number of charged particles (pT
> 0.5 GeV/c, || < 0.8) in the “toward” region (not including PTmax) as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
PTmax Direction
“Toward”
“Transverse” “Transverse”
“Away”
“Toward” Charged PTsum Density: Scalar pT sum of the charged particles (pT > 0.5 GeV/c, || < 0.8) in the “toward” region (not including PTmax) as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
“Away” Charged Particle Density: Number of charged particles (pT > 0.5 GeV/c, || < 0.8) in the “away” region as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
“Away” Charged PTsum Density: Scalar pT sum of the charged particles (pT > 0.5 GeV/c, || < 0.8) in the “away” region as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2/3, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
cut = 0.8
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 5
UE ObservablesUE Observables Overall “Associated” Charged Particle Density: Number of
charged particles (pT > 0.5 GeV/c, || < 0.8, not including PTmax) as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
PTmax Direction
“Toward”
“Transverse” “Transverse”
“Away”
Overall “Associated” Charged PTsum Density: Scalar pT sum of the charged particles (pT > 0.5 GeV/c, || < 0.8, not including PTmax) as defined by the leading charged particle, PTmax, divided by the area in - space, 2cut×2, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
Note: The overall “associated” density is equal to the average of the “Towards”, “Away”, and “Transverse” densities.
Overall “Associated” Density = (“Towards” Density + “Away” Density + “Transverse” Density)/3
cut = 0.8
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 6
UE ObservablesUE Observables “transMAX” and “transMIN” Charged Particle Density: Number
of charged particles (pT > 0.5 GeV/c, || < 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 - space, 2cut×2/6, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
PTmax Direction
“Toward”
“TransMAX” “TransMIN”
“Away”
“transMAX” and “transMIN” Charged PTsum Density: Scalar pT sum of charged particles (pT > 0.5 GeV/c, || < 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 - space, 2cut×2/6, averaged over all events with at least one particle with pT > 0.5 GeV/c, || < cut.
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
cut = 0.8
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 7
““transMIN” & “transDIF”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) and final-state radiation (FSR).
“TransDIF” density more sensitive to ISR & FSR.
PTmax Direction
“TransMAX” “TransMIN”
“Toward”
“Away”
“Toward-Side” Jet
“Away-Side” Jet
Jet #3
“TransMIN” density more sensitive to MPI & BBR.
0 ≤ “TransDIF” ≤ 2×”TransAVE”
“TransDIF” = “TransAVE” if “TransMIX” = 3×”TransMIN”
Question: Do you expect the energy dependence of the “transMIN” and “transDIF” densities to be the same? Or do you expect that one of the two densities will increase faster with increasing energy than the other? Which one and why?
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 8
Overall “Associated” DensityOverall “Associated” Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the overall “associated” charged particle and charged PTsum density as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
Overall "Associated" Density
0.0
0.6
1.2
1.8
0 4 8 12 16 20
PTmax (GeV/c)
Ove
rall
"Ass
oci
ated
" D
ensi
ty
1.96 TeV
CDF PreliminaryCorrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
PTsum (GeV/c)
Nchg
Overall "Associated" Density
0.0
0.6
1.2
1.8
0 4 8 12 16 20
PTmax (GeV/c)
Ove
rall
"Ass
oci
ated
" D
ensi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
CDF PreliminaryCorrected Data
PTsum (GeV/c)
Nchg
Overall "Associated" Density
0.0
0.4
0.8
1.2
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ove
rall
"Ass
oci
ated
" D
ensi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
PTsum (GeV/c)
300 GeV
Nchg
CDF PreliminaryCorrected Data
Overall "Associated" Density
0.0
0.7
1.4
2.1
0 4 8 12 16 20
PTmax (GeV/c)
Ove
rall
As
soc
iate
d D
ens
ity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
PTsum (GeV/c)
1.96 TeV
Nchg
Overall "Associated" Density
0.0
0.6
1.2
1.8
0 4 8 12 16 20
PTmax (GeV/c)
Ov
era
ll A
sso
cia
ted
Den
sit
y
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
PTsum (GeV/c)
900 GeV
Nchg
Overall "Associated" Density
0.0
0.4
0.8
1.2
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ove
rall
As
soc
iate
d D
ens
ity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
PTsum (GeV/c)
300 GeV
Nchg
The data are compared with PYTHIA Tune Z1.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 9
Overall “Associated” DensityOverall “Associated” Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the overall “associated” charged particle and charged PTsum density as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
Overall "Associated" Charged Particle Density
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
Ov
era
ll "A
sso
cia
ted
" D
en
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data 1.96 TeV
300 GeV
900 GeV
Overall "Associated" PTsum Density
0.0
0.6
1.2
1.8
0 4 8 12 16 20
PTmax (GeV/c)
"As
so
cia
ted
" P
Ts
um
De
nsi
ty (
GeV
/c)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
1.96 TeV
300 GeV
900 GeV
Overall Associated PTsum Density
0.0
0.6
1.2
1.8
0 4 8 12 16 20
PTmax (GeV/c)
As
soc
iate
d D
ens
ity
(Ge
V/c
)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
Overall Associated Nchg Density
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
Ove
rall
As
soc
iate
d D
ens
ity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
The data are compared with PYTHIA Tune Z1.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 10
““Associated” Charged Particle DensityAssociated” Charged Particle Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the “associated” charged particle density in the “toward”, “away”, and “transverse” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Associated" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
1.96 TeV
"Transverse"
CDF Preliminary Corrected Data
"Associated" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
900 GeV
"Transverse"
CDF Preliminary Corrected Data
"Associated" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
300 GeV
"Transverse"
CDF Preliminary Corrected Data
Associated Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
1.96 TeV
"Transverse"
Associated Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
900 GeV
"Transverse"
Associated Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
300 GeV
"Transverse"
The data are compared with PYTHIA Tune Z1.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 11
““Associated” Charged Particle DensityAssociated” Charged Particle Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the “associated” charged particle density in the “toward”, “away”, and “transverse” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Toward" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"To
war
d"
Ch
arg
ed D
ensi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data 1.96 TeV
300 GeV
900 GeV
"Away" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"Aw
ay"
Ch
arg
ed D
ensi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data 1.96 TeV
300 GeV
900 GeV
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data 1.96 TeV
300 GeV
900 GeV
The data are compared with PYTHIA Tune Z1.
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"Toward" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"To
war
d"
Ch
arg
ed D
ensi
ty
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"Away" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"Aw
ay"
Ch
arg
ed D
ensi
ty
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 12
““Associated” Charged PTsum DensityAssociated” Charged PTsum Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the “associated” charged PTsum density in the “toward”, “away”, and “transverse” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Associated" Charged PTsum Density: dPT/dd
0.0
1.0
2.0
3.0
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV/c
)
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
1.96 TeV
"Transverse"
CDF Preliminary Corrected Data
"Associated" Charged PTsum Density: dPT/dd
0.0
0.8
1.6
2.4
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV/c
)
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away""Toward"
900 GeV
"Transverse"
CDF Preliminary Corrected Data
"Associated" Charged PTsum Density: dPT/dd
0.0
0.6
1.2
1.8
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV/c
)
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"300 GeV
"Transverse"
CDF Preliminary Corrected Data
The data are compared with PYTHIA Tune Z1.
Associated Charged PTsum Density: dPT/dd
0.0
1.0
2.0
3.0
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV/c
)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"
1.96 TeV
"Transverse"
Associated Charged PTsum Density: dPT/dd
0.0
0.9
1.8
2.7
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV/c
)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away"
"Toward"900 GeV
"Transverse"
Associated Charged PTsum Density: dPT/dd
0.0
0.6
1.2
1.8
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
sum
Den
sity
(G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"Away""Toward"
300 GeV
"Transverse"
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 13
““Toward” Associated DensityToward” Associated Density
At low center-of-mass energies PTmax carries almost all the momentum of the “toward” parton (i.e. z ≈ 1) leaving very little momentum for the other particles in the “jet”.
“Toward” Parton“Away” Parton
“PTmax” Particle
300 GeV
“Associated” Toward Particles
“Away” Particles
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 14
““Toward” Associated DensityToward” Associated Density
At higher center-of-mass energies the same PTmax carries less of the momentum of the “toward” parton (i.e. z < 1) leaving more momentum for the other particles in the “jet”.
“Toward” Parton“Away” Parton
“PTmax” Particle
1.96 TeV
“Associated” Toward Particles
“Away” Particles
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 15
““Associated” Charged PTsum DensityAssociated” Charged PTsum Density
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the “associated” charged PTsum density in the “toward”, “away”, and “transverse” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Toward" Charged PTsum Density: dPT/dd
0.0
0.9
1.8
2.7
0 4 8 12 16 20
PTmax (GeV/c)
"To
war
d"
PT
sum
De
nsi
ty (
GeV
/c)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data
1.96 TeV
300 GeV
900 GeV
"Away" Charged PTsum Density: dPT/dd
0.0
0.8
1.6
2.4
0 4 8 12 16 20
PTmax (GeV/c)
"Aw
ay"
PT
sum
De
ns
ity
(G
eV
/c)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data 1.96 TeV
300 GeV
900 GeV
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed
PT
su
m D
ens
ity
(GeV
/c)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data 1.96 TeV
300 GeV
900 GeV
The data are compared with PYTHIA Tune Z1.
"Toward" Charged PTsum Density: dPT/dd
0.0
0.9
1.8
2.7
0 4 8 12 16 20
PTmax (GeV/c)
"To
war
d"
PT
sum
De
nsi
ty (
GeV
/c) CDF Preliminary
corrected dataTune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"Away" Charged PTsum Density: dPT/dd
0.0
0.8
1.6
2.4
0 4 8 12 16 20
PTmax (GeV/c)
"Aw
ay"
PT
sum
Den
sit
y (G
eV
/c) CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV300 GeV
900 GeV
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 16
““transMAX/MIN” NchgDentransMAX/MIN” NchgDen
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Transverse" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsv
ers
e"
Ch
arg
ed
Den
sit
y CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
1.96 TeV
"Transverse" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsv
ers
e"
Ch
arg
ed
Den
sit
y
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"900 GeV
"Transverse" Charged Particle Density: dN/dd
0.00
0.24
0.48
0.72
0 2 4 6 8 10 12 14
PTmax (GeV/c)
"Tra
nsv
erse
" C
ha
rge
d D
ens
ity CDF Preliminary
corrected data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
300 GeV
The data are compared with PYTHIA Tune Z1.
"Transverse" Charged Particle Density: dN/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsv
erse
" C
ha
rge
d D
ens
ity CDF Preliminary
corrected dataTune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
1.96 TeV
"Transverse" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsv
erse
" C
ha
rge
d D
ens
ity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"900 GeV
"Transverse" Charged Particle Density: dN/dd
0.00
0.24
0.48
0.72
0 2 4 6 8 10 12 14
PTmax (GeV/c)
"Tra
nsv
erse
" C
ha
rge
d D
ens
ity CDF Preliminary
corrected dataTune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
300 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 17
““transDIF/AVE” NchgDentransDIF/AVE” NchgDen
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
"TransDIF"
"TransAVE"
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
"TransDIF"
"TransAVE"
"Transverse" Charged Particle Density: dN/dd
0.0
0.2
0.4
0.6
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
300 GeV
"TransDIF"
"TransAVE"
The data are compared with PYTHIA Tune Z1.
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
"TransDIF"
"TransAVE"
"Transverse" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed
Par
ticl
e D
ens
ity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
"TransDIF"
"TransAVE"
"Transverse" Charged Particle Density: dN/dd
0.0
0.2
0.4
0.6
0 2 4 6 8 10 12 14
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
300 GeV
"TransDIF"
"TransAVE"
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 18
““transMAX/MIN” NchgDentransMAX/MIN” NchgDen
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"TransMAX" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsM
AX
" C
ha
rged
De
nsi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data
1.96 TeV
300 GeV
900 GeV
"TransMIN" Charged Particle Density: dN/dd
0.00
0.13
0.26
0.39
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
CDF PreliminaryCorrected Data
"TransDIF" Charged Particle Density: dN/dd
0.0
0.2
0.4
0.6
0.8
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
1.96 TeV
300 GeV
900 GeV
The data are compared with PYTHIA Tune Z1.
"TransMAX" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"TransMIN" Charged Particle Density: dN/dd
0.00
0.13
0.26
0.39
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"TransDIF" Charged Particle Density: dN/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 19
““transMAX/MIN” PTsumDentransMAX/MIN” PTsumDen
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
PT
su
m D
ens
ity
(G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"1.96 TeV
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
PT
su
m D
ens
ity
(G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"900 GeV
"Transverse" Charged PTsum Density: dPT/dd
0.00
0.24
0.48
0.72
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
300 GeV
The data are compared with PYTHIA Tune Z1.
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"1.96 TeV
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
PT
su
m D
ens
ity
(G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"900 GeV
"Transverse" Charged PTsum Density: dPT/dd
0.00
0.24
0.48
0.72
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
su
m D
ens
ity
(G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
300 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 20
““transDIF/AVE” PTsumDentransDIF/AVE” PTsumDen
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
"TransDIF"
"TransAVE"
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
"TransDIF"
"TransAVE"
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.2
0.4
0.6
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
300 GeV
"TransDIF"
"TransAVE"
The data are compared with PYTHIA Tune Z1.
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
"TransDIF"
"TransAVE"
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.3
0.6
0.9
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
"TransDIF"
"TransAVE"
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.2
0.4
0.6
0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
300 GeV
"TransDIF"
"TransAVE"
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 21
““transMAX/MIN” PTsumDentransMAX/MIN” PTsumDen
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum 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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"TransMAX" Charged PTsum Density: dPT/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
Ts
um
Den
sity
(G
eV/c
)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data
1.96 TeV
300 GeV
900 GeV
"TransMIN" Charged PTsum Density: dPT/dd
0.00
0.12
0.24
0.36
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
Ts
um
Den
sity
(G
eV/c
)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data 1.96 TeV
300 GeV
900 GeV
"TransDIF" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
Ts
um
De
nsi
ty (
GeV
/c)
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
1.96 TeV
300 GeV
900 GeV
The data are compared with PYTHIA Tune Z1.
"TransMAX" Charged PTsum Density: dPT/dd
0.0
0.5
1.0
1.5
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"TransMIN" Charged PTsum Density: dPT/dd
0.00
0.12
0.24
0.36
0 4 8 12 16 20
PTmax (GeV/c)
PT
su
m D
ens
ity
(G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"TransDIF" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
PT
sum
Den
sit
y (G
eV
/c)
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 22
““transMAX” NchgDen vs EtransMAX” NchgDen vs Ecmcm
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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"TransMAX" Charged Particle Density: dN/dd
0.0
0.4
0.8
1.2
0 4 8 12 16 20
PTmax (GeV/c)
"Tra
nsM
AX
" C
ha
rged
De
nsi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF PreliminaryCorrected Data
1.96 TeV
300 GeV
900 GeV
"TransMAX" Charged Particle Density: dN/dd
0.00
0.32
0.64
0.96
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
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 || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 23
““transMIN” NchgDen vs EtransMIN” NchgDen vs Ecmcm
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transMIN” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
Corrected CDF data on the charged particle density in the “transMIN” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
"TransMIN" Charged Particle Density: dN/dd
0.00
0.13
0.26
0.39
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
CDF PreliminaryCorrected Data
"TransMIN" Charged Particle Density: dN/dd
0.00
0.32
0.64
0.96
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 24
““transDIF” NchgDen vs EtransDIF” NchgDen vs Ecmcm
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transDIF” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
Corrected CDF data on the charged particle density in the “transDIF” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
"TransDIF" Charged Particle Density: dN/dd
0.0
0.2
0.4
0.6
0.8
0 4 8 12 16 20
PTmax (GeV/c)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
1.96 TeV
300 GeV
900 GeV
"TransDIF" Charged Particle Density: dN/dd
0.00
0.32
0.64
0.96
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
arti
cle
Den
sity
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 25
““Transverse” NchgDen vs ETransverse” NchgDen vs Ecmcm
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transMAX”, “transMIN”, “transAVE”, and “transDIF” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
"Transverse" Charged Particle Density: dN/dd
0.00
0.32
0.64
0.96
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
arti
cle
Den
sity
"TransMIN"
"TransMAX"
"TransDIF"
"TransAVE"
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
"Transverse" Charged Particle Density Ratio
1.0
1.5
2.0
2.5
3.0
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed D
ensi
ty R
ati
o
"TransMIN"
"TransMAX"
"TransDIF"
"TransAVE"
Divided by 300 GeV Value
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
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 “transMAX”, “transMIN”, “transAVE”, and “transDIF” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 26
““Transverse” PTsumDen vs ETransverse” PTsumDen vs Ecmcm
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density in the “transMAX”, “transMIN”, “transAVE”, and “transDIF” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
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 “transMAX”, “transMIN”, “transAVE”, and “transDIF” regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
"Transverse" Charged PTsum Density: dPT/dd
0.0
0.4
0.8
1.2
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
Ts
um
Den
sity
(G
eV/c
)
"TransMIN"
"TransMAX"
"TransDIF"
"TransAVE"
Charged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
"Transverse" Charged PTsum Density Ratio
1.0
1.5
2.0
2.5
3.0
3.5
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
PT
sum
Den
sit
y R
atio
"TransMIN"
"TransMAX"
"TransDIF"
"TransAVE"
Divided by 300 GeV ValueCharged Particles (||<0.8, PT>0.5 GeV/c)
CDF Preliminary Corrected Data
5.0 < PTmax < 6.0 GeV/c
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 27
““TransMAX/MIN” vs ETransMAX/MIN” vs Ecmcm
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transMAX”, and the “transMIN”, regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 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.
"Transverse" Charged PTsum Density: dPT/dd
0.0
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0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
Ts
um
Den
sity
(G
eV
/c) CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
"Transverse" Charged Particle Density: dN/dd
0.0
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Center-of-Mass Energy (GeV)
Ch
arg
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Par
ticl
e D
ens
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CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransMIN"
"TransMAX"
5.0 < PTmax < 6.0 GeV/c
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density in the “transMAX”, and the “transMIN”, regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 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.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 28
““TransDIF/AVE” vs ETransDIF/AVE” vs Ecmcm"Transverse" Charged Particle Density: dN/dd
0.2
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arg
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arti
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Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransAVE"
5.0 < PTmax < 6.0 GeV/c
"Transverse" Charged PTsum Density: dPT/dd
0.2
0.5
0.8
1.1
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Ch
arg
ed P
Ts
um
Den
sity
(G
eV/c
) CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransAVE"
5.0 < PTmax < 6.0 GeV/c
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density in the “transAVE”, and the “transDIF”, regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 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.
Corrected CDF data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density in the “transAVE”, and the “transDIF”, regions as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 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.
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 29
““TransMIN/DIF” vs ETransMIN/DIF” vs Ecmcm
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 || < 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.
"Transverse" Charged Particle Density Ratio
1.0
2.0
3.0
4.0
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Pa
rtic
le D
ens
ity
Rat
io
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransMIN"
5.0 < PTmax < 6.0 GeV/c
Divided by 300 GeV Value
"Transverse" Charged PTsum Density Ratio
1.0
2.0
3.0
4.0
0.1 1.0 10.0
Center-of-Mass Energy (GeV)
Pa
rtic
le D
ens
ity
Rat
io
CDF Preliminary corrected data
Tune Z1 generator level
Charged Particles (||<0.8, PT>0.5 GeV/c)
"TransDIF"
"TransMIN"
5.0 < PTmax < 6.0 GeV/c
Divided by 300 GeV Value
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 || < 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.
Answer to QuestionThe “transMIN” (MPI-BBR component) increases
much faster with center-of-mass energy than the “transDIF” (ISR-FSR component)!
Duh!!
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 30
UE Common PlotsUE Common Plots"Transverse" Charged Particle Density: dN/dd
0.0
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"Tra
ns
vers
e"
Ch
arg
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en
sity
7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c)
ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
"Transverse" Charged PTsum Density: dPT/dd
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PTmax (GeV/c)
PT
su
m D
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(G
eV
/c)
RDF Preliminary corrected data
7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c) ATLAS (solid blue)ALICE (open black)
"Transverse" Charged Particle Density: dN/dd
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900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
ATLAS (solid blue)ALICE (open black)
"Transverse" Charged PTsum Density: dPT/dd
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su
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900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
"Transverse" Charged PTsum Density: dPT/dd
0.0
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PT
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900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
"Transverse" Charged Particle Density: dN/dd
0.0
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"Tra
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arg
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en
sity RDF Preliminary
corrected data
900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
"Transverse" Charged PTsum Density: dPT/dd
0.0
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PTmax (GeV/c)
PT
su
m D
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(G
eV
/c)
RDF Preliminary corrected data
7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
"Transverse" Charged Particle Density: dN/dd
0.0
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"Tra
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7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
"Transverse" Charged Particle Density: dN/dd
0.0
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"Tra
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7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
Tune Z1 generator level
"Transverse" Charged PTsum Density: dPT/dd
0.0
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PT
su
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eV
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Tune Z1 generator level
7 TeV
Charged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
"Transverse" Charged Particle Density: dN/dd
0.0
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PTmax (GeV/c)
"Tra
ns
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arg
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ensi
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900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
"Transverse" Charged PTsum Density: dPT/dd
0.0
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0 2 4 6 8 10 12 14
PTmax (GeV/c)
PT
su
m D
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sity
(G
eV
/c)
900 GeVCharged Particles (|| < 0.8, PT > 0.5 GeV/c)
CMS (solid red)ATLAS (solid blue)ALICE (open black)
RDF Preliminary corrected data
Tune Z1 generator level
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 31
““Tevatron” to the LHCTevatron” to the LHC"Transverse" Charged Particle Density: dN/dd
0.0
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PTmax (GeV/c)
"Tra
nsv
erse
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har
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Den
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RDF Preliminary Corrected Data
Charged Particles (PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
PYTHIA Tune Z1
7 TeV
CDF
CDFCDF
ALICE
ATLAS CMS
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 32
““Tevatron” to the LHCTevatron” to the LHC"Transverse" Charged PTsum Density: dPT/dd
0.0
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PTmax (GeV/c)
"Tra
nsv
erse
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Tsu
m D
ensi
ty (
GeV
/c)
Charged Particles (PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
PYTHIA Tune Z1
CDF Preliminary Corrected Data
Tune Z1 Generator Level 7 TeV
CDF
CDF
CDF
ALICE
ATLASCMS
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 33
New CDF MB DataNew CDF MB DataPseudo-Rapidity Distribution: dN/d
0
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rag
e N
um
ber
1.96 TeV
300 GeV
900 GeV
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
At least 1 charged particle
New Corrected CDF data at 300 GeV, 900 GeV, and 1.96 TeV on on pseudo-rapidity distribution of charged particles, dN/d, with pT > 0.5 GeV/c. Events are required to have at least one charged particle with || < 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.
Pseudo-Rapidity Distribution: dN/d
1.5
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Ave
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e N
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Charged Particles (||<0.8, PT>0.5 GeV/c)
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CDF
CMS
Pseudo-Rapidity Distribution: dN/d
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300 GeV
900 GeV
RDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
At least 1 charged particle
7 TeV
Tune Z1
CDF
CDFCDF
CMS
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 34
CDF versus CMSCDF versus CMSPseudo-Rapidity Distribution: dN/d
0
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-1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0
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Av
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ber
RDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
At least 1 charged particle
CDF
CMS
CDF and CMS data at 900 GeV on the pseudo-rapidity distribution, dN/d, for charged with pT > 0.5 GeV/c and || < 0.8 for events with at least one charged particle with pT > 0.5 GeV/c and || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
CDF and CMS data at 900 GeV/c 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 || < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty.
"Transverse" Charged Particle Density: dN/dd
0.0
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0 5 10 15 20 25
PTmax (GeV/c)
"Tra
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ha
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d D
ens
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Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeVCDF red squaresCMS black dots
CDF slightly higher than CMS!
CDF slightly higher than CMS!
"Transverse" Charged Particle Density: dN/dd
0.0
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0 6 12 18 24
PTmax (GeV/c)
"Tra
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Den
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RDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
900 GeV
CDF
ATLAS ALICE
CMS
CDF slightly higher than LHC!
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 35
Overall Charged Particle DensityOverall Charged Particle DensityPseudo-Rapidity Distribution: dN/d
0
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-1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0
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Av
erag
e N
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ber
1.96 TeV
300 GeV
900 GeV
CDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
At least 1 charged particle
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
8.0
8.0
dd
dNNchg
Corrected CDF data on the pseudo-rapidity distribution, dN/d, for charged with pT > 0.5 GeV/c and || < 0.8 for events with at least one charged particle with pT > 0.5 GeV/c and || < 0.8.
Corrected CDF and CMS data overall density of charged particles with pT > 0.5 GeV/c and || < 0.8 for events with at least one charged particle with pT > 0.5 GeV/c and || < 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.
Overall Charged Particle Density
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CMS red squaresCDF blue dots
At least 1 charged particle
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 36
MB versus the UEMB versus the UE
Charged Particle Density
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CMS squaresCDF dots
Overall
At least 1 charged particle
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Overall Charged Particle Density
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CMS red squaresCDF blue dots
At least 1 charged particle
"Transverse" Charged Particle Density: dN/dd
0.2
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Center-of-Mass Energy (TeV)
"Tra
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Ch
arg
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Den
sit
y RDF Preliminary Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
5.0 < PTmax < 6.0 GeV/c
CMS red squaresCDF blue dots
Corrected CDF and CMS data on the overall density of charged particles with pT > 0.5 GeV/c and || < 0.8 for events with at least one charged particle with pT > 0.5 GeV/c and || < 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 || < 0.8 with 5 < PTmax < 6 GeV/c. The data are plotted versus the center-of-mass energy (log scale).
"Transverse" Charged Particle Density: dN/dd
0.2
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Center-of-Mass Energy (TeV)
"Tra
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Charged Particles (||<0.8, PT>0.5 GeV/c)
5.0 < PTmax < 6.0 GeV/c
RDF Preliminary Corrected Data
Tune Z1 Generator Level
PYTHIA Tune Z1
CMS red squaresCDF blue dots
Overall Charged Particle Density
0.20
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Center-of-Mass Energy (TeV)
Ch
arg
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CMS red squaresCDF blue dots
At least 1 charged particle
RDF Preliminary Corrected Data
Tune Z1 Generator Level
PYTHIA Tune Z1
Charged Particle Density
0.0
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Center-of-Mass Energy (TeV)
Ch
arg
ed D
ensi
ty
Charged Particles (||<0.8, PT>0.5 GeV/c)
CMS squaresCDF dots
Overall
At least 1 charged particle
"Transverse"5 < PTmax < 6 GeV/c
RDF Preliminary Corrected Data
Tune Z1 Generator Level
PYTHIA Tune Z1
Amazing!
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 37
““Transverse”/OverallTransverse”/Overall"Transverse" Charged Particle Density Ratio
1.2
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Center-of-Mass Energy (TeV)
"Tra
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Den
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y R
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Charged Particles (||<0.8, PT>0.5 GeV/c)
5.0 < PTmax < 6.0 GeV/c
RDF Preliminary Corrected Data
CMS red squaresCDF blue dots
"Transverse" divided by Overall
"Transverse" Charged Particle Density Ratio
1.0
1.5
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0 5 10 15 20 25 30 35
PTmax (GeV/c)
"Tra
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Ch
arg
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Den
sit
y R
atio RDF Preliminary
Corrected Data
Charged Particles (||<0.8, PT>0.5 GeV/c)
1.96 TeV
300 GeV
900 GeV
"Transverse" divided by overall
7 TeV
Corrected CDF and CMS data on the charged particle density ratio, in the “transverse” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8. The ratio corresponds to the “transverse” charged particle density divided by the overall charged particle density.
Corrected CDF and CMS data on the charged particle density ratio, in the “transverse” region as defined by the leading charged particle (PTmax) for charged particles with pT > 0.5 GeV/c and || < 0.8 for 5 < PTmax < 6 GeV/c. The ratio corresponds to the “transverse” charged particle density divided by the overall charged particle density. The data are plotted versus the center-of-mass energy (log scale).
Amazing!
"Transverse" Charged Particle Density Ratio
1.2
1.4
1.6
1.8
2.0
0.1 1.0 10.0
Center-of-Mass Energy (TeV)
"Tra
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rged
Den
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Charged Particles (||<0.8, PT>0.5 GeV/c)
5.0 < PTmax < 6.0 GeV/c
CMS red squaresCDF blue dots
"Transverse" divided by Overall
RDF Preliminary Corrected Data
Tune Z1 Generator Level
PYTHIA Tune Z1
Cosmic QCD 2013 LPTHE Paris, May 15, 2013
Rick Field – Florida/CDF/CMS Page 38
Summary & ConclusionsSummary & Conclusions 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”.
The “transverse” (i.e. “transAVE”) increases faster with center-of-mass energy than the overall charged density (Nchg ≥ 1)!
Soon we will have at lot of MB & UE data at300 GeV, 900 GeV, 1.96 TeV, 7 TeV, and 8 TeV!
We can study the energy dependence more precisely than ever before!
What we are learning shouldallow for a deeper understanding of MPI
which will result in more precisepredictions at the future LHC energy of 13 TeV!