CDF-QCD Data for Theory
Part 1 “Leading Jet” Topology
Rick Field
University of Florida
The goal is to produce data (corrected to the
particle level) that can be used by the theorists to
tune and improve the QCD Monte-Carlo models
that are used to simulate hadron-hadron
collisions.
Outline of Talk
¨ The “Towards”, “Away”, and
“Transverse” regions of η-φ space.
Rick Field & Craig Group
¨ Four Event Topologies.
CERN December 11. 2007
¨ The “transMAX” and “transMIN”
regions.
Outgoing Parton
PT(hard)
¨ The observables. First look at
Initial-State Radiation
Proton
average quantities. Then do
distributions.
¨ Show some “preliminary” results
for the “leading jet” topology.
CMS Week (Generator Tools)
December 11, 2007
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
CDF Run 2
Page 1
“Towards”, “Away”, “Transverse”
Jet #1 Direction
“Transverse” region is
very sensitive to the
“underlying event”!
Look at the charged
particle density, the
charged PTsum density
and the ETsum density in
all 3 regions!
Δφ Correlations relative to the leading jet
Charged particles pT > 0.5 GeV/c |η| < 1
Calorimeter towers ET > 0.1 GeV |η| < 1
“Toward-Side” Jet
2π
Away Region
Jet #1 Direction
Δφ
Δφ
Transverse
Region
“Toward”
“Toward”
“Transverse”
“Transverse”
“Away”
“Transverse”
“Transverse”
φ
Leading
Jet
Toward Region
“Away”
Transverse
Region
“Away-Side” Jet
Away Region
0
-1
η
+1
¨ Look at correlations in the azimuthal angle Δφ relative to the leading charged particle jet (|η| <
1) or the leading calorimeter jet (|η| < 2).
¨ Define |Δφ| < 60o as “Toward”, 60o < |Δφ| < 120o as “Transverse ”, and |Δφ| > 120o as “Away”.
Each of the three regions have area ΔηΔφ = 2×120o = 4π/3.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 2
Event Topologies
¨ “Leading Jet” events correspond to the leading
calorimeter jet (MidPoint R = 0.7) in the region |η| < 2
with no other conditions.
¨ “Back-to-Back Inclusive 2-Jet” events are selected to
have at least two jets with Jet#1 and Jet#2 nearly “backto-back” (Δφ12 > 150o) with almost equal transverse
energies (PT(jet#2)/PT(jet#1) > 0.8) with no other
conditions .
¨ “Back-to-Back Exclusive 2-Jet” events are selected to
have at least two jets with Jet#1 and Jet#2 nearly “backto-back” (Δφ12 > 150o) with almost equal transverse
energies (PT(jet#2)/PT(jet#1) > 0.8) and PT(jet#3) < 15
GeV/c.
Jet #1 Direction
Δφ
“Leading Jet”
“Toward”
“Transverse”
“Transverse”
subset
“Away”
Jet #1 Direction
Δφ
“Back-to-Back Inc2J”
“Toward”
subset
“Transverse”
“Transverse”
“Away”
“Back-to-Back Exc2J”
Jet #2 Direction
ChgJet #1
Δφ
¨ “Leading ChgJet” events correspond to the leading
charged particle jet (R = 0.7) in the region |η| < 1 with
no other conditions.
“Charged Jet”
“Toward”
“Transverse”
“Transverse”
“Away”
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 3
“transMAX” & “transMIN”
Jet #1 Direction
Jet #1 Direction
Δφ
Area = 4π/6
“Toward-Side” Jet
“transMIN” very sensitive to
the “beam-beam remnants”!
Δφ
“Toward”
“TransMAX”
“Toward”
“TransMIN”
“TransMAX”
“Away”
“TransMIN”
Jet #3
“Away”
“Away-Side” Jet
¨ Define the MAX and MIN “transverse” regions (“transMAX” and “transMIN”) on an
event-by-event basis with MAX (MIN) having the largest (smallest) density. Each of the
two “transverse” regions have an area in η-φ space of 4π/6.
¨ The “transMIN” region is very sensitive to the “beam-beam remnant” and multiple
parton interaction components of the “underlying event”.
¨ The difference, “transDIF” (“transMAX” minus “transMIN”), is very sensitive to the
“hard scattering” component of the “underlying event” (i.e. hard initial and final-state
radiation).
¨ The overall “transverse” density is the average of the “transMAX” and “transMIN”
densities.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 4
“Leading Jet” Observables at the
Particle and Detector Level
“Leading Jet”
Jet #1 Direction
Observable
Particle Level
Detector Level
dNchg/dηdφ
Number of charged particles
per unit η-φ
(pT > 0.5 GeV/c, |η| < 1)
Number of “good” charged tracks
per unit η-φ
(pT > 0.5 GeV/c, |η| < 1)
dPTsum/dηdφ
Scalar pT sum of charged particles
per unit η-φ
(pT > 0.5 GeV/c, |η| < 1)
Scalar pT sum of “good” charged tracks per
unit η-φ
(pT > 0.5 GeV/c, |η| < 1)
<pT>
Average pT of charged particles
(pT > 0.5 GeV/c, |η| < 1)
Average pT of “good” charged tracks
(pT > 0.5 GeV/c, |η| < 1)
PTmax
Maximum pT charged particle
(pT > 0.5 GeV/c, |η| < 1)
Require Nchg ≥ 1
Maximum pT “good” charged tracks
(pT > 0.5 GeV/c, |η| < 1)
Require Nchg ≥ 1
dETsum/dηdφ
Scalar ET sum of all particles
per unit η-φ
(all pT, |η| < 1)
Scalar ET sum of all calorimeter towers
per unit η-φ
(ET > 0.1 GeV, |η| < 1)
PTsum/ETsum
Scalar pT sum of charged particles
(pT > 0.5 GeV/c, |η| < 1)
divided by the scalar ET sum of
all particles (all pT, |η| < 1)
Scalar pT sum of “good” charged tracks
(pT > 0.5 GeV/c, |η| < 1)
divided by the scalar ET sum of
calorimeter towers (ET > 0.1 GeV, |η| < 1)
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
Jet #2 Direction
“Back-to-Back”
CMS Week (Generator Tools)
December 11, 2007
Also include the leading jet mass (new)!
Rick Field – Florida/CDF/CMS
Page 5
Overall Totals (|η| < 1)
“Leading Jet”
Overall Totals versus PT(jet#1)
1000
CDF Run 2 Preliminary
Jet #1 Direction
ETsum (GeV)
data corrected
pyA generator level
Δφ
PTsum (GeV/c)
Average
100
“Overall”
Nchg
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
10
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Stable Particles (|η|<1.0, all PT)
1
0
50
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the overall number of charged particles (pT > 0.5 GeV/c, |η| < 1) and the overall
scalar pT sum of charged particles (pT > 0.5 GeV/c, |η| < 1) and the overall scalar ET sum of all
particles (|η| < 1) for “leading jet” events as a function of the leading jet pT. The data are corrected to
the particle level (with errors that include both the statistical error and the systematic uncertainty) and
are compared with PYTHIA Tune A at the particle level (i.e. generator level)..
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 6
Overall Totals (|η| < 1)
ETsum = 775 GeV!
“Leading Jet”
Overall Totals versus PT(jet#1)
ETsum = 330 GeV
1000
CDF Run 2 Preliminary
Jet #1 Direction
ETsum (GeV)
data corrected
pyA generator level
Δφ
PTsum (GeV/c)
Average
100
“Overall”
Nchg
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
10
PTsum = 190 GeV/c
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Stable Particles (|η|<1.0, all PT)
1
0
50
Nchg = 30
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the overall number of charged particles (pT > 0.5 GeV/c, |η| < 1) and the overall
scalar pT sum of charged particles (pT > 0.5 GeV/c, |η| < 1) and the overall scalar ET sum of all
particles (|η| < 1) for “leading jet” events as a function of the leading jet pT. The data are corrected to
the particle level (with errors that include both the statistical error and the systematic uncertainty) and
are compared with PYTHIA Tune A at the particle level (i.e. generator level)..
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 7
Overall Totals (|η| < 1)
“Leading Jet”
Overall Number of Charged Particles
Jet #1 Direction
Δφ
“Overall”
Average Number of Charged
Particles
40
CDF Run 2 Preliminary
PY Tune A
data corrected
generator level theory
30
20
10
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
HW
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0
0
50
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the overall number of charged particles (pT > 0.5 GeV/c, |η| < 1) for “leading jet” events
as a function of the leading jet pT. The data are corrected to the particle level (with errors that include both
the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune A and HERWIG
(without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 8
Overall Totals (|η| < 1)
“Leading Jet”
OverallOverall
Number
of Charged
Particles
Charged
PTsum
Jet #1 Direction
Δφ
AverageNumber
PTsumof(GeV/c)
Average
Charged
Particles
40040
CDF
CDFRun
Run2 2Preliminary
Preliminary
30030
PY Tune A
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data
corrected
data
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level
theory
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PY Tune A
20020
“Overall”
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MidPoint R=0.7 |η(jet#1)|<2
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HW
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
00
00
5050
100
100
150
150
200
200
250
250
300
300
350
350
400
400
PT(jet#1) (GeV/c)
(GeV/c)
PT(jet#1)
¨ Data
Data at
at 1.96
1.96 TeV
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the overall
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|η| < 1) for “leading jet” events
¨
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of charged
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T > 0.5 GeV/c, |η| < 1) for “leading jet”
as a function
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HERWIG
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 9
Overall Totals (|η| < 1)
“Leading Jet”
Overall
Number
ofversus
Charged
Particles
Overall
Charged
PTsum
Overall
ETsum
PT(jet#1)
Jet #1 Direction
Δφ
Average
PTsum
Average
ETsum
(GeV)
Average
Number
of(GeV/c)
Charged
Particles
400
80040
CDF
Run
CDF
Run
2Preliminary
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CDF
Run
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300
60030
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corrected
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MidPoint R=0.7 |η(jet#1)|<2
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HW
HW
00 0
00 0
50
50
50
100
100
100
150
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ChargedStable
Particles
(|η|<1.0,
PT>0.5
GeV/c)
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(|η|<1.0,
all
PT)
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Particles
(|η|<1.0,
PT>0.5
GeV/c)
200
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250
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300
300
350
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400
400
PT(jet#1)
PT(jet#1) (GeV/c)
(GeV/c)
¨ Data
Data
at
1.96
TeV
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the
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MPI)
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level
(i.e. generator
generator
level).
at the particle
level
(i.e.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 10
“Towards”, “Away”, “Transverse”
“Leading Jet”
Charged Particle Density: dN/dηdφ
5
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
Average Charged Density
CDF Run 2 Preliminary
"Away"
data corrected
pyA generator level
4
"Toward"
3
"Leading Jet"
Factor of MidPoint
~4.5 R=0.7 |η(jet#1)|<2
2
"Transverse"
1
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0
0
50
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the density of charged particles, dN/dηdφ, with pT > 0.5 GeV/c and |η| < 1 for “leading
jet” events as a function of the leading jet pT for the “toward”, “away”, and “transverse” regions. The
data are corrected to the particle level (with errors that include both the statistical error and the systematic
uncertainty) and are compared with PYTHIA Tune A at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 11
“Towards”, “Away”, “Transverse”
“Leading Jet”
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
Charged
PTsum
Density
(GeV/c)
Average
Charged
Density
Charged PTsum
ParticleDensity:
Density:dPT/dηdφ
dN/dηdφ
Charged
5
100.0
CDFCDF
RunRun
2 Preliminary
2 Preliminary
4
data corrected
data corrected
pyA generator level
pyA generator level
10.0
3
"Toward"
"Away"
"Toward"
"Away"
Factor of ~16
"Transverse" "Leading Jet"
Factor of MidPoint
~4.5 R=0.7 |η(jet#1)|<2
2
1.0
"Transverse"
1
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
ChargedParticles
Particles(|η|<1.0,
(|η|<1.0,PT>0.5
PT>0.5GeV/c)
GeV/c)
Charged
0 0.1
0 0
50 50
100100
150
150
200
200
250
250
300
300
350
350
400
400
PT(jet#1)
PT(jet#1)(GeV/c)
(GeV/c)
¨ Data at 1.96 TeV on the charged particle scalar pT sum density, dPT/dηdφ, with pT > 0.5 GeV/c and |η| < 1
for “leading jet” events as a function of the leading jet pT for the “toward”, “away”, and “transverse”
regions. The data are corrected to the particle level (with errors that include both the statistical error and
the systematic uncertainty) and are compared with PYTHIA Tune A at the particle level (i.e. generator
level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 12
“Towards”, “Away”, “Transverse”
“Leading Jet”
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
ETsum
Density
(GeV)
Charged
PTsum
Density
(GeV/c)
Average
Charged
Density
Charged
Particle
Density:
dN/dηdφ
Charged
PTsum
Density:
dPT/dηdφ
ETsum
Density:
dET/dηdφ
5
100.0
100.0
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RunRun
2 Preliminary
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data corrected
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Factor of ~13
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of ~16
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~4.5 R=0.7 |η(jet#1)|<2
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50 50
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MidPoint R=0.7 |η(jet#1)|<2
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Particles
(|η|<1.0,
PT>0.5
GeV/c)
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Particles
(|η|<1.0,
PT>0.5
GeV/c)
Particles
(|η|<1.0,
all
PT)
200
200
200
250
250
250
300
300
300
350
350
350
400
400
400
PT(jet#1)
PT(jet#1)(GeV/c)
(GeV/c)
PT(jet#1)
(GeV/c)
¨ Data
Data at
at 1.96
1.96 TeV
TeV on
on the
the charged
density ofparticle
charged
particles,
dN/d
ηdφ, with
p > 0.5 GeV/c
and |η| < 1 for
¨
pT sum
density,
and“leading
|ηas
| <a1
T > 0.5 GeV/c
¨
Data at
1.96 TeV
on the
particle scalar
ETscalar
sum density,
dET/d
ηddPT/d
φ, forTη|ηd|φ<, with
1 for p“leading
jet” events
jet” events as a function of the leading jet p for the “toward”, “away”, and “transverse” regions. The
for “leading
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as pa function
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anddata
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and
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The
data
are
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(
) and
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to the particle level (with errors that include both the statistical error and the systematic uncertainty
uncertainty
)
and
are
compared
with
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Tune
A
at
the
particle
level
(
i.e.
generator
level).
the
systematic
uncertainty
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and
are
compared
with
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Tune
A
at
the
particle
level
(
i.e.
generator
compared with PYTHIA Tune A at the particle level (i.e. generator level).
level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 13
The “Toward” Region
“Leading Jet”
"Toward" Charged Particle Density: dN/dηdφ
4
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
"Toward" Charged Density
CDF Run 2 Preliminary
data corrected
generator level theory
3
PY Tune A
2
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
1
HW
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
0
0
50
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the density of charged particles, dN/dηdφ, with pT > 0.5 GeV/c and |η| < 1 for “leading
jet” events as a function of the leading jet pT for the “toward” region. The data are corrected to the particle
level (with errors that include both the statistical error and the systematic uncertainty) and are compared with
PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 14
The “Toward” Region
“Leading Jet”
"Toward" Charged
Charged PTsum
ParticleDensity:
Density:dPT/dηdφ
dN/dηdφ
"Toward"
Jet #1 Direction
Δφ
“Toward”
“Transverse”
“Transverse”
“Away”
"Toward"
PTsum
Density
(GeV/c)
"Toward"
Charged
Density
4
50
CDF Run
Run 22 Preliminary
Preliminary
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leveltheory
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40
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"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
"Leading Jet"
MidPoint R=0.7 |η(jet#1)|<2
20
1
10
HW
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
Charged Particles (|η|<1.0, PT>0.5 GeV/c)
00
00
50
50
100
100
150
150
200
200
250
250
300
300
350
350
400
400
PT(jet#1)
PT(jet#1) (GeV/c)
(GeV/c)
¨ Data
charged
particles,
dN/d
ηdφη, with
pT >p0.5> GeV/c
andand
|η| <|η1| for
Data at
at 1.96
1.96 TeV
TeV on
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 15
The “Toward” Region
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December 11, 2007
Rick Field – Florida/CDF/CMS
Page 16
The “Away” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 17
The “Away” Region
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December 11, 2007
Rick Field – Florida/CDF/CMS
Page 18
The “Away” Region
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December 11, 2007
Rick Field – Florida/CDF/CMS
Page 19
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 20
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 21
The “Transverse” Region
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December 11, 2007
Rick Field – Florida/CDF/CMS
Page 22
The “Transverse” Region
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Rick Field – Florida/CDF/CMS
Page 23
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 24
The “Transverse” Region
“Leading Jet”
"Transverse" Charged Particle Density: dN/dηdφ
Jet #1 Direction
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50
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200
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300
350
400
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¨ Data at 1.96 TeV on the density of charged particles, dN/dηdφ, with pT > 0.5 GeV/c and |η| < 1 for “leading
jet” events as a function of the leading jet pT for the “transverse” region. The data are corrected to the
particle level (with errors that include both the statistical error and the systematic uncertainty) and are
compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 25
The “Transverse” Region
“Leading Jet”
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Δφ
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compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 26
The “Transverse” Region
“Leading Jet”
Jet #1 Direction
Δφ
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50
100
150
200
250
300
350
400
PT(jet#1) (GeV/c)
¨ Data at 1.96 TeV on the charged scalar pT sum density, dPT/dηdφ, with pT > 0.5 GeV/c and |η| < 1 for
“leading jet” events as a function of the leading jet pT for the “transverse” region. The data are corrected to
the particle level (with errors that include both the statistical error and the systematic uncertainty) and are
compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 27
The “Transverse” Region
Jet #1 Direction
Δφ
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 28
The “Transverse” Region
“Leading Jet”
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350
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¨ Data at 1.96 TeV on the scalar ET sum density, dET/dηdφ, with |η| < 1 for “leading jet” events as a function
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include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune A and
HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 29
The “Transverse” Region
“Leading Jet”
Jet #1 Direction
Δφ
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 30
The Leading Jet Mass
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statistical error and the systematic uncertainty) and are compared with PYTHIA Tune A and HERWIG
(without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 31
The Leading Jet Mass
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 32
The “Transverse” Region
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HERWIG (without MPI).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 33
The “Transverse” Region
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level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 34
The “TransMAX/MIN” Regions
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particle level (with errors that include both the statistical error and the systematic uncertainty) and are
compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 35
The “TransMAX/MIN” Regions
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at the
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(i.e. generator level).
generator
PYTHIA Tune
A and HERWIG
MPI) at
the particle
(i.e.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 36
The “TransMAX/MIN” Regions
“Leading Jet”
"TransMAX"
Charged Particle
Particle Density:
Density: dN/dηdφ
dN/dηdφ
"TransMIN"
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and are compared
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HERWIG
(without
at
the level
particle
(i.e. generator
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 37
The “TransMAX/MIN” Regions
“Leading Jet”
Jet #1 Direction
Δφ
“Toward”
“TransMAX”
“TransMIN”
“Away”
"TransMAX" PTsum Density (GeV/c)
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50
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150
200
250
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350
400
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¨ Data at 1.96 TeV on the charged scalar pT sum density, dPT/dηdφ, with pT > 0.5 GeV/c and |η| < 1 for
“leading jet” events as a function of the leading jet pT for the “transMAX” region. The data are corrected
to the particle level (with errors that include both the statistical error and the systematic uncertainty) and are
compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 38
The “TransMAX/MIN” Regions
“Leading Jet”
Jet #1 Direction
Δφ
“Toward”
“TransMAX”
“TransMIN”
“Away”
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(i.e. generator level).
generator
PYTHIA Tune
and HERWIG
MPI) at
the particle
(i.e.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 39
The “TransMAX/MIN” Regions
“Leading Jet”
"TransMAX"
ChargedPTsum
PTsumDensity:
Density:dPT/dηdφ
dPT/dηdφ
"TransMIN"
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150
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300
300
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jet”
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and are compared with PYTHIA Tune A and HERWIG (without MPI) at the particle level (i.e. generator
level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 40
The “TransMAX/MIN” Regions
“Leading Jet”
"TransMAX" ETsum Density: dET/dηdφ
Jet #1 Direction
Δφ
“Toward”
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200
250
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¨ Data at 1.96 TeV on the scalar ET sum density, dET/dηdφ, with |η| < 1 for “leading jet” events as a function
of the leading jet pT for the “transMAX” region. The data are corrected to the particle level (with errors that
include both the statistical error and the systematic uncertainty) and are compared with PYTHIA Tune A and
HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 41
The “TransMAX/MIN” Regions
“Leading Jet”
"TransMAX"
"TransMIN" ETsum Density: dET/dηdφ
Jet #1 Direction
Δφ
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150
150
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300
300
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350
400
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HERWIG (without MPI) at the particle level (i.e. generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 42
The “TransMAX/MIN” Regions
“Leading Jet”
Jet #1 Direction
Δφ
“Toward”
“TransMAX”
“TransMIN”
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250
250
300
300
300
350
350
350
400
400
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with ||η
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events as
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corrected
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the
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include
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PYTHIA
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systematic uncertainty
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MPI)
at the particle
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Tune A and(without
HERWIG
(without
MPI) at level
the particle
level (i.e.
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 43
Summary
¨ It is important to produce a lot of plots (corrected to the particle level) so that the theorists
can tune and improve the QCD Monte-Carlo models. If they improve the “transverse”
region they might miss-up the “toward” region etc.. We need to show the whole story!
¨ We are making good progress in understanding and
modeling the “underlying event”. However, we do not
yet have a perfect fit to all the features of the CDF
“underlying event” data!
¨ There are over 128 plots to get “blessed” and then
published. So far we have only looked at average
quantities. We plan to also produce distributions and
flow plots
¨ I will construct a “CDF-QCD Data for Theory”
WEBsite with the “blessed” plots together with
tables of the data points and errors so that people
can have access to the results .
PT(hard)
Initial-State Radiation
Proton
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
Final-State
Radiation
CDF-QCD Data for Theory
¨ Need to measure “Min-Bias” and the “underlying
event” at the LHC as soon as possible and tune the
Monte-Carlo modles and compare with CDF!
CMS Week (Generator Tools)
December 11, 2007
Outgoing Parton
Rick Field – Florida/CDF/CMS
UE&MB@CMS
Page 44
Summary
¨ It is important to produce a lot of plots (corrected to the particle level) so that the theorists
can tune and improve the QCD Monte-Carlo models. If they improve the “transverse”
region they might miss-up the “toward” region etc.. We need to show the whole story!
¨ We are making good progress in understanding and
modeling the “underlying event”. However, we do not
See the “analysis approval” talk by Livio on Friday!
Proton
yet have a perfect fit to all the features of the CDF
“underlying event” data!
Outgoing Parton
PT(hard)
Initial-State Radiation
AntiProton
Underlying Event
¨ There are over 128 plots to get “blessed” and then
published. So far we have only looked at average
quantities. We plan to also produce distributions and
flow plots
¨ I will construct a “CDF-QCD Data for Theory”
WEBsite with the “blessed” plots together with
tables of the data points and errors so that people
can have access to the results .
Final-State
Radiation
CDF-QCD Data for Theory
¨ Need to measure “Min-Bias” and the “underlying
event” at the LHC as soon as possible and tune the
Monte-Carlo modles and compare with CDF!
CMS Week (Generator Tools)
December 11, 2007
Outgoing Parton
Underlying Event
Rick Field – Florida/CDF/CMS
UE&MB@CMS
Page 45