CDF-QCD Workshop
Fermilab September 2011
MB & UE Energy Dependence
Rick Field
University of Florida
Outline of Talk
 How well did we do at predicting the
behavior of the “underlying event” at the
LHC (900 GeV and 7 TeV)?
 PYTHIA 6.4 Tune Z1: CMS 6.4 tune
(pT-ordered parton showers and new
MPI).
CDF Run 2
300 GeV, 900 GeV, 1.96 TeV
 MB & UE “Common Plots”.
Outgoing Parton
PT(hard)
Initial-State Radiation
Proton
 My plans (hopes!) for CDF at 300
AntiProton
Underlying Event
Underlying Event
GeV, 900 GeV, and 1.96 TeV.
Outgoing Parton
CDF-QCD Workshop
Fermilab September 28, 2011
Final-State
Radiation
Rick Field – Florida/CDF/CMS
CMS at the LHC
900 GeV & 7 TeV
Page 1
QCD Monte-Carlo Models:
High Transverse Momentum Jets
Hard Scattering
Initial-State Radiation
Hard Scattering “Jet”
Initial-State Radiation
“Jet”
Outgoing Parton
PT(hard)
Outgoing Parton
PT(hard)
Proton
“Hard Scattering” Component
AntiProton
Final-State Radiation
Outgoing Parton
Underlying Event
Underlying Event
Proton
“Jet”
Final-State Radiation
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
“Underlying Event”
 Start with the perturbative 2-to-2 (or sometimes 2-to-3) parton-parton scattering and add initial and finalstate gluon radiation (in the leading log approximation or modified leading log approximation).
 The “underlying event” consists of the “beam-beam remnants” and from particles arising from soft or
semi-soft multiple parton interactions (MPI).
The “underlying
event” is“jet”
an unavoidable
 Of course the outgoing colored partons fragment
into hadron
and inevitably “underlying event”
background to most collider observables
observables receive contributions from initial
and final-state radiation.
and having good understand of it leads to
more precise collider measurements!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 2
Traditional Approach
CDF Run 1 Analysis Charged Particle Df Correlations
Leading Calorimeter Jet or
Charged Jet #1
Leading Charged Particle Jet or
PT > PTmin |h| < hcut
Direction
Leading Charged Particle or
2
“Transverse” region
very sensitive to the
“underlying event”!
Away RegionZ-Boson
“Toward-Side” Jet
Df
“Toward”
“Transverse”
“Transverse”
“Away”
Leading Object
Direction
Df
“Toward”
“Transverse”
“Transverse”
Transverse
Region
f
Leading
Object
Toward Region
Transverse
Region
“Away”
Away Region
0
-hcut
“Away-Side” Jet
h
+hcut
 Look at charged particle correlations in the azimuthal angle Df relative to a leading object (i.e.
CaloJet#1, ChgJet#1, PTmax, Z-boson). For CDF PTmin = 0.5 GeV/c hcut = 1.
 Define |Df| < 60o as “Toward”, 60o < |Df| < 120o as “Transverse”, and |Df| > 120o as
“Away”.
 All three regions have the same area in h-f space, Dh×Df = 2hcut×120o = 2hcut×2/3. Construct
densities by dividing by the area in h-f space.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 3
“Transverse” Charged Density
PTmax Direction
"Transverse" Charged Particle Density: dN/dhdf
Df
1.6
“Transverse”
“Transverse”
“Away”
ChgJet#1 Direction
Df
“Toward”
“Transverse”
“Transverse”
“Away”
"Transverse" Charged Density
“Toward”
RDF Preliminary
7 TeV
py Tune DW generator level
1.2
PTmax
0.8
ChgJet#1
DY(muon-pair)
70 < M(pair) < 110 GeV
0.4
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
Muon-Pair Direction
Df
0
5
10
15
20
25
30
35
40
45
50
PT(chgjet#1) or PTmax or PT(pair) (GeV/c)
“Toward”
“Transverse”
“Transverse”
“Away”
 Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5
GeV/c, |h| < 1) at 7 TeV as defined by PTmax, PT(chgjet#1), and PT(muon-pair) from PYTHIA
Tune DW at the particle level (i.e. generator level). Charged particle jets are constructed using
the Anti-KT algorithm with d = 0.5.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 4
Min-Bias “Associated”
Charged Particle Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
RDF Preliminary
14 TeV
Min-Bias
"Transverse" Charged Density
"Transverse" Charged Density
1.2
py Tune DW generator level
10 TeV
7 TeV
0.8
1.96 TeV
0.9 TeV
0.4
0.2 TeV
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
RDF Preliminary
LHC14
py Tune DW generator level
0.8
LHC10
LHC7
Tevatron
900 GeV
0.4
PTmax = 5.25 GeV/c
RHIC
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
0
25
2
Df
“Toward”
RHIC
“Transverse”
“Transverse”
0.2 TeV → 1.96 TeV
(UE increase ~2.7 times)
Tevatron
“Away”
6
8
10
12
14
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
PTmax Direction
4
PTmax Direction
Df
“Toward”
“Transverse”
PTmax Direction
1.96 TeV → 14 TeV
(UE increase ~1.9 times)
LHC
“Transverse”
“Away”
Df
“Toward”
“Transverse”
“Transverse”
“Away”
 Shows the “associated” charged particle density in the “transverse” region as a function of PTmax
for charged particles (pT > 0.5 GeV/c, |h| < 1, not including PTmax) for “min-bias” events at 0.2
TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle level
Linear scale!
(i.e. generator level).
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 5
Min-Bias “Associated”
Charged Particle Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
RDF Preliminary
14 TeV
Min-Bias
"Transverse" Charged Density
"Transverse" Charged Density
1.2
py Tune DW generator level
10 TeV
7 TeV
0.8
1.96 TeV
0.9 TeV
0.4
0.2 TeV
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
RDF Preliminary
py Tune DW generator level
LHC14
LHC10
LHC7
0.8
Tevatron
0.4
900 GeV
RHIC
PTmax = 5.25 GeV/c
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0.1
Df
“Toward”
LHC7
“Transverse”
100.0
PTmax Direction
7 TeV → 14 TeV
(UE increase ~20%)
Df
“Toward”
LHC14
“Transverse”
“Away”
10.0
Center-of-Mass Energy (TeV)
PTmax (GeV/c)
PTmax Direction
1.0
Linear on a log plot!
“Transverse”
“Transverse”
“Away”
 Shows the “associated” charged particle density in the “transverse” region as a function of PTmax
for charged particles (pT > 0.5 GeV/c, |h| < 1, not including PTmax) for “min-bias” events at 0.2
TeV, 0.9 TeV, 1.96 TeV, 7 TeV, 10 TeV, 14 TeV predicted by PYTHIA Tune DW at the particle level
Log scale!
(i.e. generator level).
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 6
“Transverse” Charged Particle Density
PT(chgjet#1) Direction
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Density
0.8
Df
RDF Preliminary
Fake Data
pyDW generator level
ChgJet#1
“Toward”
0.6
PTmax
“Transverse”
“Transverse”
0.4
Leading Charged
Particle Jet, chgjet#1.
“Away”
0.2
900 GeV
Prediction!
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
PTmax Direction
0.0
0
2
4
6
8
10
12
14
16
PTmax or PT(chgjet#1) (GeV/c)
“Toward”
 Fake data (from MC) at 900 GeV on the
“transverse” charged particle density,
dN/dhdf, as defined by the leading charged
particle (PTmax) and the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2. The fake
data (from PYTHIA Tune DW) are
generated at the particle level (i.e. generator
level) assuming 0.5 M min-bias events at
900 GeV (361,595 events in the plot).
CDF-QCD Workshop
Fermilab September 28, 2011
Df
18
Rick Field – Florida/CDF/CMS
“Transverse”
“Transverse”
Leading Charged
Particle, PTmax.
“Away”
Rick Field
MB&UE@CMS Workshop
CERN, November 6, 2009
Page 7
“Transverse” Charged Particle Density
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
RDF Preliminary
Fake Data
pyDW generator level
"Transverse" Charged Density
"Transverse" Charged Density
0.8
ChgJet#1
0.6
PTmax
0.4
0.2
900 GeV
Monte-Carlo!
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.8
CMS Preliminary
ChgJet#1
data uncorrected
pyDW + SIM
0.6
PTmax
0.4
0.2
900 GeV
Real Data!
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
2
4
6
8
10
12
14
16
18
0
2
6
8
10
12
14
16
18
PTmax or PT(chgjet#1) (GeV/c)
PTmax or PT(chgjet#1) (GeV/c)
 Fake data (from MC) at 900 GeV on the
“transverse” charged particle density,
dN/dhdf, as defined by the leading charged
particle (PTmax) and the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2. The fake
data (from PYTHIA Tune DW) are
generated at the particle level (i.e. generator
level) assuming 0.5 M min-bias events at
900 GeV (361,595 events in the plot).
CDF-QCD Workshop
Fermilab September 28, 2011
4
 CMS preliminary data at 900 GeV on the
“transverse” charged particle density,
dN/dhdf, as defined by the leading charged
particle (PTmax) and the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2. The data are
uncorrected and compared with PYTHIA
Tune DW after detector simulation (216,215
events in the plot).
Rick Field – Florida/CDF/CMS
Page 8
“Transverse” Charge Density
"Transverse" Charged Particle Density: dN/dhdf
Rick Field
MB&UE@CMS Workshop
CERN, November 6, 2009
"Transverse" Charged Density
1.2
RDF Preliminary
py Tune DW generator level
7 TeV
0.8
factor of 2!
900 GeV
0.4
Prediction!
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
4
10
0.0
0
2
6
8
12
14
16
18
20
PTmax (GeV/c)
PTmax Direction
Df
LHC
900 GeV
“Toward”
“Transverse”
PTmax Direction
900 GeV → 7 TeV
(UE increase ~ factor of 2)
“Transverse”
“Away”
~0.4 → ~0.8
Df
“Toward”
LHC
7 TeV
“Transverse”
“Transverse”
“Away”
 Shows the charged particle density in the “transverse” region for charged particles (pT > 0.5
GeV/c, |h| < 2) at 900 GeV and 7 TeV as defined by PTmax from PYTHIA Tune DW and at the
particle level (i.e. generator level).
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 9
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
3.0
1.2
CMS Preliminary
7 TeV
data uncorrected
pyDW + SIM
Ratio: 7 TeV/900 GeV
Charged Particle Density
CMS Preliminary
0.8
Ratio
CMS
900 GeV
0.4
data uncorrected
pyDW + SIM
2.0
CMS
1.0
7 TeV / 900 GeV
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
2
4
6
8
10
12
14
16
18
PT(chgjet#1) (GeV/c)
PT(chgjet#1) GeV/c
 CMS preliminary data at 900 GeV and 7 TeV  Ratio of CMS preliminary data at 900 GeV
and 7 TeV on the “transverse” charged
on the “transverse” charged particle density,
particle density, dN/dhdf, as defined by the
dN/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles with leading charged particle jet (chgjet#1) for
charged particles with pT > 0.5 GeV/c and |h|
pT > 0.5 GeV/c and |h| < 2. The data are
< 2. The data are uncorrected and compared
uncorrected and compared with PYTHIA Tune
with PYTHIA Tune DW after detector
DW after detector simulation.
PT(chgjet#1) Direction
simulation. PT(chgjet#1) Direction
Df
Df
“Toward”
“Transverse”
“Toward”
“Transverse”
“Transverse”
“Away”
CDF-QCD Workshop
Fermilab September 28, 2011
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 10
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
3.0
3.0
RDF Preliminary
data uncorrected
pyDW + SIM
Ratio: 7 TeV/900 GeV
Ratio: 7 TeV/900 GeV
CMS Preliminary
2.0
CMS
1.0
7 TeV / 900 GeV
ATLAS corrected data
pyDW generator level
2.0
ATLAS
1.0
7 TeV / 900 GeV
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
2
4
6
8
10
12
14
16
18
0
1
 Ratio of CMS preliminary data at 900 GeV
and 7 TeV on the “transverse” charged
particle density, dN/dhdf, as defined by the
leading charged particle jet (chgjet#1) for
charged particles with pT > 0.5 GeV/c and |h|
< 2. The data are uncorrected and compared
with PYTHIA Tune DW after detector
simulation. PT(chgjet#1) Direction
Df
4
5
6
7
8
9
10
11
 Ratio of the ATLAS preliminary data at
900 GeV and 7 TeV on the “transverse”
charged particle density, dN/dhdf, as
defined by the leading charged particle
(PTmax) for charged particles with pT > 0.5
GeV/c and |h| < 2.5. The data are corrected
and compared with PYTHIA Tune DW at
the generator level.PTmax DirectionDf
“Toward”
“Toward”
“Transverse”
“Transverse”
“Away”
CDF-QCD Workshop
Fermilab September 28, 2011
3
PTmax (GeV/c)
PT(chgjet#1) (GeV/c)
“Transverse”
2
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 11
12
PYTHIA Tune DW
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
Charged Particle Density
CMS Preliminary
"Transverse" Charged Density
1.2
7 TeV
data uncorrected
pyDW + SIM
0.8
CMS
900 GeV
0.4
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
1.2
RDF Preliminary
7 TeV
ATLAS corrected data
Tune DW generator level
0.8
ATLAS
900 GeV
0.4
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
30
35
40
45
50
0
2
4
6
8
10
12
14
16
18
20
PTmax (GeV/c)
PT(chgjet#1) GeV/c
 CMS preliminary data at 900 GeV and 7 TeV  ATLAS preliminary data at 900 GeV and 7 TeV
on the “transverse” charged particle density,
on the “transverse” charged particle density,
dN/dhdf, as defined by the leading charged
dN/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles with particle (PTmax) for charged particles with pT >
0.5 GeV/c and |h| < 2.5. The data are corrected
pT > 0.5 GeV/c and |h| < 2. The data are
uncorrected and compared with PYTHIA Tune and compared with PYTHIA Tune DW at the
generator level.
DW after detector simulation.
PT(chgjet#1) Direction
PTmax Direction
Df
Df
“Toward”
“Transverse”
“Toward”
“Transverse”
“Transverse”
“Away”
CDF-QCD Workshop
Fermilab September 28, 2011
“Transverse”
“Away”
Rick Field – Florida/CDF/CMS
Page 12
Charged Particle Density
1.96 TeV
data corrected
pyDW generator level
Charged Particle Density
Average Charged Density
3
Drell-Yan Production
70 < M(pair) < 110 GeV
2
1
Average Charged Density
Large increase in the UE
in going from 1.96 TeV
Charged Particle Density: dN/dhdf
Charged Particle Density: dN/dhdf
"Toward" Charged Particle Density: dN/dhdf
to 7 TeV as predicted by
3
Tune DW! 1.2 RDF Preliminary
CDF RunPYTHIA
2
CMS Preliminary
data corrected
"Away"
pyDW generator level
0.8
Drell-Yan
Production
Charged Particles
(|h|<1.0, PT>0.5
GeV/c)
excluding the lepton-pair
0
10
20
30
40
50
60
0
70
PT(lepton-pair) GeV/c
80
20
90
Initial-State Radiation
“Transverse”
“Transverse”
“Away”
"Toward"
Charged Particles (PT>0.5 GeV/c)
0 60
PT(lepton-pair) GeV/c
Outgoing Parton
T
"Transverse"
1
100
40
High P Z-Boson Production
CDF:DfProton-Antiproton
Collisions at 1.96 GeV
Lepton Cuts: pT > 20 GeV |h| < 1.0
“Toward”
Proton
Mass Cut:
70 < M(lepton-pair) < 110
GeV
AntiProton
Charged Particles: pT > 0.5 GeV/c |h| < 1.0
Z-Boson Direction
"Away"
Drell-Yan Production
60 < M(pair) < 120 GeV
2
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
excluding the lepton-pair
0
0.0
0
CMS
CDF 1.96 TeV
0.4
"Transverse"
"Toward"
7 TeV
data corrected
CMS pyDW
7 TeV
generator level
2080
40
100
60
80
100
PT(lepton-pair) GeV/c
High P Z-Boson Production
CMS: Proton-Proton
Collisions at 7 GeV
Df
Lepton Cuts: pT > 20 GeV |h| < 2.4
“Toward”
Mass Cut:Proton
60 < M(lepton-pair) < 120 Proton
GeV
Charged Particles: pT > 0.5 GeV/c |h| < 2.0
Z-Boson Direction
Outgoing Parton
T
Initial-State Radiation
“Transverse”
“Transverse”
“Away”
Z-boson
Z-boson
 CDF data at 1.96 TeV on the density of charged particles, dN/dhdf, with pT > 0.5 GeV/c and |h| < 1 for Drell-
Yan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with
PYTHIA Tune DW.
 CMS data at 7 TeV on the density of charged particles, dN/dhdf, with pT > 0.5 GeV/c and |h| < 2 for DrellYan production as a function of PT(Z) for the “toward”, “away”, and “transverse” regions compared with
PYTHIA Tune DW.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 13
PYTHIA Tune DW
Charged Particle Density: dN/dhdf
"Toward" Charged Particle Density: dN/dhdf
3
1.2
CMS
7 TeV
data corrected
pyDW generator level
"Away"
Drell-Yan Production
60 < M(pair) < 120 GeV
2
Charged Particle Density
Average Charged Density
CMS Preliminary
data corrected
pyDW generator level
CMS 7 TeV
0.8
CDF 1.96 TeV
Overall PYTHIA0.4Tune DW
"Toward"
is in amazingly good agreement
with the
Charged Particles (PT>0.5 GeV/c)
Drell-Yan Production
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
excluding
the
lepton-pair
Tevatron Jet production 0.0
and Drell-Yan data
20
40
60 did a very
80
100 job in
0 predicting
20
60
80
and
good
the40
PT(lepton-pair) GeV/c
PT(lepton-pair) GeV/c
LHC Jet production and Drell-Yan data!
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
(although not perfect)
"Transverse"
1
0
0
100
1.5
1.5
RDF Preliminary
data corrected
pyDW generator level
Charged Particle Density
RDF Preliminary
Charged Particle Density
RDF Preliminary
CMS 7 TeV
1.0
CDF 1.96 TeV
0.5
CMS 900 GeV
CMS 7 TeV
data corrected
pyDW generator level
1.0
CDF 1.96 TeV
0.5
CMS 900 GeV
Charged Particles (PT>0.5 GeV/c)
Charged Particles (PT>0.5 GeV/c)
0.0
0.0
0
20
40
60
80
100
0
100
150
200
250
PT(chgjet#1 or jet#1) GeV/c
PT(chgjet#1 or jet#1) GeV/c
CDF-QCD Workshop
Fermilab September 28, 2011
50
Rick Field – Florida/CDF/CMS
Page 14
300
PYTHIA Tune Z1
 All my previous tunes (A, DW, DWT, D6,
D6T, CW, X1, and X2) were PYTHIA 6.4
tunes using the old Q2-ordered parton
showers and the old MPI model (really 6.2
tunes)!
 I believe that it is time to move to PYTHIA
6.4 (pT-ordered parton showers and new
MPI model)!
 Tune Z1: I started with the parameters of
ATLAS Tune AMBT1, but I changed LO* to
CTEQ5L and I varied PARP(82) and PARP(90)
to get a very good fit of the CMS UE data at 900
GeV and 7 TeV.
 The ATLAS Tune AMBT1 was designed to fit
the inelastic data for Nchg ≥ 6 and to fit the
PTmax UE data with PTmax > 10 GeV/c. Tune
AMBT1 is primarily a min-bias tune, while
Tune Z1 is a UE tune!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
PARP(90)
PARP(82)
Color
Connections
Diffraction
Outgoing Parton
PT(hard)
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
Underlying Event
Final-State
Radiation
UE&MB@CMS
Page 15
PYTHIA Tune Z1
Tune Z1
(R. Field CMS)
Tune AMBT1
(ATLAS)
CTEQ5L
LO*
PARP(82) – MPI Cut-off
1.932
2.292
PARP(89) – Reference energy, E0
1800.0
1800.0
PARP(90) – MPI Energy Extrapolation
0.275
0.25
PARP(77) – CR Suppression
1.016
1.016
PARP(78) – CR Strength
0.538
0.538
0.1
0.1
PARP(83) – Matter fraction in core
0.356
0.356
PARP(84) – Core of matter overlap
0.651
0.651
PARP(62) – ISR Cut-off
1.025
1.025
PARP(93) – primordial kT-max
10.0
10.0
MSTP(81) – MPI, ISR, FSR, BBR model
21
21
MSTP(82) – Double gaussion matter distribution
4
4
MSTP(91) – Gaussian primordial kT
1
1
MSTP(95) – strategy for color reconnection
6
6
Parameter
Parton Distribution Function
Parameters not
shown are the
PYTHIA 6.4 defaults!
PARP(80) – Probability colored parton from BBR
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 16
CMS UE Data
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged Particle Density: dN/dhdf
2.0
CMS Preliminary
CMS Preliminary
data corrected
Tune Z1 generator level
7 TeV
PTsum Density (GeV/c)
Charged Particle Density
1.6
1.2
0.8
900 GeV
CMS
0.4
Tune Z1
data corrected
Tune Z1 generator level
1.6
7 TeV
1.2
CMS
0.8
900 GeV
Tune Z1
0.4
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
10
20
30
40
50
60
70
80
90
100
0
10
PT(chgjet#1) GeV/c
CDF-QCD Workshop
Fermilab September 28, 2011
30
40
50
60
70
80
90
100
PT(chgjet#1) GeV/c
 CMS preliminary data at 900 GeV and 7 TeV
on the “transverse” charged particle density,
dN/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2.0. The data
are corrected and compared with PYTHIA
Tune Z1 at the generator level.
CMS corrected
data!
20
 CMS preliminary data at 900 GeV and 7 TeV
on the “transverse” charged PTsum density,
dPT/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2.0. The data
are corrected and compared with PYTHIA
Tune Z1 at the generator level.
Very nice agreement!
Rick Field – Florida/CDF/CMS
CMS corrected
data!
Page 17
ATLAS UE Data
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.5
RDF Preliminary
RDF Preliminary
7 TeV
ATLAS corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.2
0.8
ATLAS
900 GeV
0.4
Tune Z1
7 TeV
ATLAS corrected data
Tune Z1 generator level
1.0
ATLAS
900 GeV
0.5
Tune Z1
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0
5
10
15
20
25
PTmax (GeV/c)
PTmax (GeV/c)
 ATLAS published data at 900 GeV and 7 TeV  ATLAS published data at 900 GeV and 7 TeV
on the “transverse” charged particle density,
on the “transverse” charged PTsum density,
dN/dhdf, as defined by the leading charged
dPT/dhdf, as defined by the leading charged
particle (PTmax) for charged particles with
particle (PTmax) for charged particles with
pT > 0.5 GeV/c and |h| < 2.5. The data are
pT > 0.5 GeV/c and |h| < 2.5. The data are
corrected and compared with PYTHIA Tune
corrected and compared with PYTHIA Tune
Z1 at the generator level.
Z1 at the generrator level.
ATLAS publication – arXiv:1012.0791
December 3, 2010
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 18
CMS-ATLAS UE Data
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.6
RDF Preliminary
RDF Preliminary
CMS: Chgjet#1
data corrected
Tune Z1 generator level
Charged Particle Density
Charged Particle Density
1.6
1.2
0.8
CMS (red)
ATLAS (blue)
ATLAS: PTmax
0.4
Tune Z1
data corrected
Tune Z1 generator level
1.2
0.8
CMS (red)
ATLAS (blue)
Tune Z1
0.4
Charged Particles (PT > 0.5 GeV/c)
7 TeV
Charged Particles (PT > 0.5 GeV/c)
7 TeV
0.0
0.0
0
5
10
15
20
25
30
0
10
20
30
40
50
60
70
80
90
PTmax or PT(chgjet#1) (GeV/c)
PTmax or PT(chgjet#1) (GeV/c)
 CMS preliminary data at 7 TeV on the “transverse” charged particle density, dN/dhdf, as
defined by the leading charged particle jet (chgjet#1) for charged particles with pT > 0.5 GeV/c
and |h| < 2.0 together with the ATLAS published data at 7 TeV on the “transverse” charged
particle density, dN/dhdf, as defined by the leading charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 2.5 The data are corrected and compared with PYTHIA
Tune Z1 at the generator level.
Amazing agreement!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 19
100
Jet Radius Dependence
The UE activity is higher
for large jet radius!
"Transverse" Charged Particle Density: dN/dhdf
Charged Particle Density
1.5
d = 1.0
RDF Preliminary
pyZ1 generator level
1.0
d = 0.5
7 TeV
d = 0.2
0.5
Chgjet#1 (|h|<1.5)
Tune Z1
Charged Particles (|h|<2.5, PT>0.5 GeV/c)
0.0
0
10
20
30
40
50
60
70
80
90
100
PT(chgjet#1) GeV/c
 The charged particle density in the “transverse” region as defined by the leading charged
particle jet from PYTHIA Tune Z1. The charged particles are in the region pT > 0.5 GeV/c and
|h| < 2.5. Charged particle jets are constructed using the Anti-KT algorithm with d = 0.2, 0.5,
and 1.0 from charged particles in the region pT > 0.5 GeV/c and |h| < 2.5, however, the leading
charged particle jet is required to have |h(chgjet#1)| < 1.5.
It seems that large jet radius “biases” the UE
to be more active!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 20
ALICE UE Data
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.5
RDF Preliminary
RDF Preliminary
7 TeV
ALICE corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.2
0.8
900 GeV
0.4
ALICE
Tune Z1
7 TeV
ALICE corrected data
Tune Z1 generator level
1.0
900 GeV
0.5
ALICE
Tune Z1
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0
5
 ALICE preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
15
20
25
PTmax (GeV/c)
PTmax (GeV/c)
I read the points off
with a ruler!
10
 ALICE preliminary data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generrator level.
ALICE UE Data: Talk by S. Vallero
MPI@LHC 2010 Glasgow, Scotland
November 30, 2010
Rick Field – Florida/CDF/CMS
Page 21
MB&UE Working Group
MB & UE Common Plots
CMS
ATLAS
 The LPCC MB&UE Working Group has suggested
several MB&UE “Common Plots” the all the LHC
groups can produce and compare with each other.
Outgoing Parton
“Minimum Bias” Collisions
PT(hard)
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
CDF-QCD Workshop
Fermilab September 28, 2011
Proton
Proton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 22
ATLAS UE Data
"Transverse" Charged Particle Density: dN/dhdf
1.5
RDF Preliminary
7 TeV
RDF Preliminary
ATLAS corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
"Transverse" Charged Density
1.2
"Transverse" Charged PTsum Density: dPT/dhdf
0.8
900 GeV
0.4
ATLAS
Tune Z1
7 TeV
ATLAS corrected data
Tune Z1 generator level
1.0
900 GeV
0.5
ATLAS
Tune Z1
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
0.0
0
5
10
15
20
25
0
5
PTmax (GeV/c)
10
15
20
25
PTmax (GeV/c)
 ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
 ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged PTsum
density, dPT/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generrator level.
ATLAS-CONF-2011-009
February 21, 2011
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 23
ALICE-ATLAS UE
"Transverse" Charged Particle Density: dN/dhdf
"Transverse" Charged Particle Density: dN/dhdf
1.2
RDF Preliminary
"Transverse" Charged Density
"Transverse" Charged Density
1.2
7 TeV
ALICE corrected data
Tune Z1 generator level
0.8
900 GeV
0.4
ALICE
Tune Z1
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
RDF Preliminary
7 TeV
ATLAS corrected data
Tune Z1 generator level
0.8
900 GeV
0.4
ATLAS
Tune Z1
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0.0
0
5
10
15
20
25
0
10
15
20
25
PTmax (GeV/c)
PTmax (GeV/c)
 ALICE preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
5
 ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generrator level.
Rick Field – Florida/CDF/CMS
Page 24
ALICE-ATLAS UE
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
1.5
1.5
RDF Preliminary
7 TeV
ALICE corrected data
Tune Z1 generator level
PTsum Density (GeV/c)
PTsum Density (GeV/c)
RDF Preliminary
1.0
900 GeV
0.5
ALICE
Tune Z1
1.0
900 GeV
0.5
ATLAS
Tune Z1
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
7 TeV
ATLAS corrected data
Tune Z1 generator level
Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
0.0
0
5
10
15
20
25
0
PTmax (GeV/c)
10
15
20
25
PTmax (GeV/c)
 ALICE preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
5
 ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generrator level.
Rick Field – Florida/CDF/CMS
Page 25
PYTHIA Tune Z1
"Transverse"Charged
ChargedParticle
ParticleDensity:
Density:dN/dhdf
dN/dhdf
"Transverse"
1.2
"Transverse" Charged Particle Density: dN/dhdf
1.5
CMSPreliminary
Preliminary
RDF
RDF Preliminary
data
corrected
data
corrected
Tune generator
Z1 generator
level
pyZ1
level
CMS 7 TeV7 TeV
Charged Particle Density
Charged
Charged Particle
Particle Density
Density
1.6
1.5
1.0
CDF 1.96 TeV
0.8
900 GeV
0.5
0.4
CMS 900 GeV
Tune Z1
data corrected
pyZ1 generator level
CMS 7 TeV
1.0
CDF 1.96 TeV
0.5
CMS 900 GeV
Tune Z1
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
Charged Particles (PT>0.5 GeV/c)
0.0
0.0
Charged Particles (PT>0.5 GeV/c)
0.0
00
10
20
20
30
40
40
50
60
60
70
80
80
90
100
100
0
50
PT(chgjet#1)
GeV/c
PT(chgjet#1
or jet#1)
GeV/c
 CMS data at 900 GeV on the “transverse”
charged particle density, dN/dhdf, as defined
by the leading charged particle jet (chgjet#1)
for charged particles with pT > 0.5 GeV/c and
|h| < 2.0. The data are corrected and
compared with PYTHIA Tune Z1 at the
generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
100
150
200
250
300
PT(chgjet#1 or jet#1) GeV/c
 CDF data at 1.96 TeV on the “transverse”
charged particle density, dN/dhdf, as defined
by the leading calorimeter jet (jet#1) for
charged particles with pT > 0.5 GeV/c and |h|
< 1.0. The data are corrected and compared
with PYTHIA Tune Z1 at the generator level.
Rick Field – Florida/CDF/CMS
Page 26
PYTHIA Tune Z1
"Transverse" Charged PTsum Density: dPT/dhdf
"Transverse" Charged PTsum Density: dPT/dhdf
2.0
2.0
RDF Preliminary
datacorrected
corrected
data
Tune
generator
level
pyZ1 Z1
generator
level
1.6
7 TeV
CMS
7 TeV
1.2
PTsum Density (GeV/c)
PTsum Density (GeV/c)
CMSPreliminary
Preliminary
RDF
CDF 1.96 TeV
0.8
900 GeV
CMS 900 GeV
Tune Z1
0.4
CMS 7 TeV
data corrected
pyZ1 generator level
1.6
CDF 1.96 TeV
1.2
0.8
Tune Z1
CMS 900 GeV
0.4
Charged Particles (PT>0.5 GeV/c)
Charged Particles (PT>0.5 GeV/c)
Charged Particles (|h|<2.0, PT>0.5 GeV/c)
0.0
0.0
0
10
20
30
40
50
60
70
80
90
100
0
100
150
200
250
300
PT(chgjet#1 or jet#1) GeV/c
PT(chgjet#1
or jet#1)
GeV/c
PT(chgjet#1)
GeV/c
 CMS data at 900 GeV and 7 TeV on the
“transverse” charged PTsum density,
dPT/dhdf, as defined by the leading charged
particle jet (chgjet#1) for charged particles
with pT > 0.5 GeV/c and |h| < 2.0. The data
are corrected and compared with PYTHIA
Tune Z1 at the generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
50
 CDF data at 1.96 TeV on the “transverse”
charged PTsum density, dPT/dhdf, as defined
by the leading calorimeter jet (jet#1) for
charged particles with pT > 0.5 GeV/c and |h|
< 1.0. The data are corrected and compared
with PYTHIA Tune Z1 at the generator level.
Rick Field – Florida/CDF/CMS
Page 27
PYTHIA Tune Z1
MPI Cut-Off PT0(Wcm)
3.5
RDF Very Preliminary
3.0
PT0 (GeV/c)
CDF 1.96 TeV
2.5
CMS 7 TeV
2.0
Tune Z1
pT0(W)=pT0(W/W0)e
1.5
CMS 900 GeV
1.0
0
2000
4000
6000
8000
10000
12000
Center-of-Mass Energy Wcm (GeV)
 MPI Cut-Off versus the Center-of Mass Energy Wcm: PYTHIA Tune Z1 was determined
by fitting pT0 independently at 900 GeV and 7 TeV and calculating e = PARP(90). The best
fit to pT0 at CDF is slightly higher than the Tune Z1 curve. This is very preliminary!
Perhaps with a global fit to all three energies (i.e. “Professor” tune) one can get a
simultaneous fit to all three??
pT0(W)=pT0(W/W0)e e = PARP(90) pT0 = PARP(82) W = Ecm
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 28
PYTHIA Tune Z1
MPI Cut-Off PT0(Wcm)
3.5
RDF Very Preliminary
3.0
PT0 (GeV/c)
CDF 1.96 TeV
2.5
CMS 7 TeV
2.0
Tune Z1
1.5
More UE activity for
W > 7 TeV!??
CMS 900 GeV
1.0
0
2000
4000
6000
8000
10000
12000
Center-of-Mass Energy Wcm (GeV)
 MPI Cut-Off versus the Center-of Mass Energy Wcm: PYTHIA Tune Z1 was determined
by fitting pT0 independently at 900 GeV and 7 TeV and calculating e = PARP(90). The best
fit to pT0 at CDF is slightly higher than the Tune Z1 curve. This is very preliminary!
Perhaps with a global fit to all three energies (i.e. “Professor” tune) one can get a
simultaneous fit to all three??
pT0(W)=pT0(W/W0)e e = PARP(90) pT0 = PARP(82) W = Ecm
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 29
New CDF Energies
1.2
1.2
RDF Preliminary
Preliminary
RDF
MPI Cut-Off PT0(Wcm)
3.5
TeV
77 TeV
ATLAScorrected
correcteddata
data
ATLAS
TuneZ1
Z1generator
generatorlevel
level
Tune
RDF Very Preliminary
3.0
CDF 1.96 TeV
0.8
0.8
PT0 (GeV/c)
"Transverse"
"Transverse" Charged
Charged Density
Density
"Transverse" Charged
Charged Particle
Particle Density:
Density: dN/dhdf
dN/dhdf
"Transverse"
1.96 TeV CDF
900 GeV
GeV
900
0.4
0.4
900 GeV CDF
ATLAS
2.5
CMS 7 TeV
2.0
Tune Z1
300 GeV CDF
Tune Z1
1.5
Charged Particles
Particles (|h|<0.8,
(|h|<0.8, PT>0.5
PT>0.5 GeV/c)
GeV/c)
Charged
CMS 900 GeV
1.0
0.0
0.0
00
55
10
10
15
15
20
20
25
25
0
2000
PTmax (GeV/c)
(GeV/c)
PTmax
 ATLAS preliminary data at 900 GeV and 7
TeV on the “transverse” charged particle
density, dN/dhdf, as defined by the leading
charged particle (PTmax) for charged
particles with pT > 0.5 GeV/c and |h| < 0.8.
The data are corrected and compared with
PYTHIA Tune Z1 at the generator level.
CDF-QCD Workshop
Fermilab September 28, 2011
4000
6000
8000
10000
12000
Center-of-Mass Energy Wcm (GeV)
 Predictions for CDF on the “transverse”
charged particle density, dN/dhdf, as defined
by the leading charged particle (PTmax) for
charged particles with pT > 0.5 GeV/c and |h|
< 0.8 from PYTHIA Tune Z1 at the generator
level.
Rick Field – Florida/CDF/CMS
Page 30
MB Common Plots 900 GeV
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 31
MB Common Plots 7 TeV
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 32
Other Comparisons
CDF 300 GeV!
Direct charged particles (including leptons) corrected to
the particle level with no correction for SD or DD.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 33
CMS Common Plots
Observable
900 GeV
7 TeV
MB1: dNchg/dh Nchg ≥ 1
|h| < 0.8 pT > 0.5 Gev/c & 1.0 GeV/c
Done
QCD-10-024
Done
QCD-10-024
MB2: dNchg/dpT Nchg ≥ 1 |h| < 0.8
Stalled
Stalled
MB3: Multiplicity Distribution
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
Stalled
Stalled
MB4: <pT> versus Nchg
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
In progress
(Antwerp)
In progress
(Antwerp)
UE1: Transverse Nchg & PTsum as
defined by the leading charged
particle, PTmax
|h| < 0.8 pT > 0.5 GeV/c & 1.0 GeV/c
In progress
(M. Zakaria)
In progress
(M. Zakaria)
Direct charged particles (including leptons) corrected to
the particle level with no corrections for SD or DD.
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 34
Rick’s Plan UE
Outgoing Parton
PT(hard)
Initial-State Radiation
Hope!
 Produce the CDF PTmax UE “common plots” at
900 GeV to compare with ALICE-ATLAS-CMS.
Must correct the data to the particle level!
Proton
AntiProton
Underlying Event
Underlying Event
Final-State
Radiation
Outgoing Parton
"Transverse" Charged Particle Density: dN/dhdf
0.8
"Transverse" Charged Density
Standard CDF Track Selection: ???
COT tracks (do not need silicon)
One and only one primary vertex
|z| ≤ 60 cm, |d0| < 0.5 cm, |z - Zvtx| < 2 cm
pT > 0.5 GeV/c, |h| < 1.0 & 0.8
RDF Preliminary
Tune Z1 generator level
0.6
ALICE (red)
ATLAS (blue)
0.4
0.2
900 GeV
Charged Particles (|h| < 0.8, PT > 0.5 GeV/c)
0.0
0
2
Need Monte-Carlo at SIM & GEN at 900 GeV!
(300 GeV, 900 GeV, 1.96 TeV) at CDF.
Must correct the data to the particle level!
6
8
10
"Transverse" Charged Particle Density: dN/dhdf
1.2
"Transverse" Charged Density
 Study the energy dependence of the PTmax UE
4
PTmax (GeV/c)
RDF Preliminary
7 TeV
ATLAS corrected data
Tune Z1 generator level
0.8
1.96 TeV CDF
900 GeV
900 GeV CDF
0.4
300 GeV CDF
Charged Particles (|h|<0.8, PT>0.5 GeV/c)
0.0
0
Need Monte-Carlo at SIM & GEN at 300 GeV!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
5
10
15
20
PTmax (GeV/c)
Page 35
25
Rick’s Plan MB
 Produce the CDF MB “common plots” at 900 GeV to
compare with ALICE-ATLAS-CMS.
Actually I would be very happy if someone else
does the MB. However, it comes along with the
UE analysis without much extra work!
 Study the energy dependence of MB (300 GeV, 900
GeV, 1.96 TeV) at CDF.
Actually I would be very happy if someone else
does the MB. However, it comes along with the
UE analysis without much extra work!
CDF-QCD Workshop
Fermilab September 28, 2011
Rick Field – Florida/CDF/CMS
Page 36