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 h-f 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

average quantities. Then do
distributions.
Show some “preliminary” results
for the “leading jet” topology.
CMS Week (Generator Tools)
December 11, 2007
Initial-State Radiation
Proton
AntiProton
Underlying Event
Outgoing Parton
Underlying Event
Final-State
Radiation
Rick Field – Florida/CDF/CMS
CDF Run 2
Page 1
“Towards”, “Away”, “Transverse”
Look at the charged
particle density, the
charged PTsum density
and the ETsum density in
all 3 regions!
f Correlations relative to the leading jet
Jet #1 Direction
“Transverse” region is
very sensitive to the
“underlying event”!
Charged particles pT > 0.5 GeV/c |h| < 1
Calorimeter towers ET > 0.1 GeV |h| < 1
“Toward-Side” Jet
2
Away Region
Jet #1 Direction
f
f
Transverse
Region
“Toward”
“Toward”
“Transverse”
“Transverse”
“Away”
“Transverse”
“Transverse”
f
Leading
Jet
Toward Region
“Away”
Transverse
Region
“Away-Side” Jet
Away Region
0
-1
h
+1
 Look at correlations in the azimuthal angle frelative to the leading charged particle jet (|h| <
1) or the leading calorimeter jet (|h| < 2).
 Define |f| < 60o as “Toward”, 60o < |f| < 120o as “Transverse ”, and |f| > 120o as “Away”.
o
Each of the three regions have area hf = 2×120 = 4/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 |h| < 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” (f12 > 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” (f12 > 150o) with almost equal transverse
energies (PT(jet#2)/PT(jet#1) > 0.8) and PT(jet#3) < 15
GeV/c.
 “Leading ChgJet” events correspond to the leading
charged particle jet (R = 0.7) in the region |h| < 1 with
no other conditions.
Jet #1 Direction
f
“Leading Jet”
“Toward”
“Transverse”
“Transverse”
subset
“Away”
Jet #1 Direction
f
“Back-to-Back Inc2J”
“Toward”
subset
“Transverse”
“Transverse”
“Away”
“Back-to-Back Exc2J”
Jet #2 Direction
ChgJet #1
Direction f
“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
f
Area = 4/6
“transMIN” very sensitive to
the “beam-beam remnants”!
“Toward-Side” Jet
f
“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 h-f space of 4/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/dhdf
Number of charged particles
per unit h-f
(pT > 0.5 GeV/c, |h| < 1)
Number of “good” charged tracks
per unit h-f
(pT > 0.5 GeV/c, |h| < 1)
dPTsum/dhdf
Scalar pT sum of charged particles
per unit h-f
(pT > 0.5 GeV/c, |h| < 1)
Scalar pT sum of “good” charged tracks per
unit h-f
(pT > 0.5 GeV/c, |h| < 1)
<pT>
Average pT of charged particles
(pT > 0.5 GeV/c, |h| < 1)
Average pT of “good” charged tracks
(pT > 0.5 GeV/c, |h| < 1)
PTmax
Maximum pT charged particle
(pT > 0.5 GeV/c, |h| < 1)
Require Nchg ≥ 1
Maximum pT “good” charged tracks
(pT > 0.5 GeV/c, |h| < 1)
Require Nchg ≥ 1
dETsum/dhdf
Scalar ET sum of all particles
per unit h-f
(all pT, |h| < 1)
Scalar ET sum of all calorimeter towers
per unit h-f
(ET > 0.1 GeV, |h| < 1)
PTsum/ETsum
Scalar pT sum of charged particles
(pT > 0.5 GeV/c, |h| < 1)
divided by the scalar ET sum of
all particles (all pT, |h| < 1)
Scalar pT sum of “good” charged tracks
(pT > 0.5 GeV/c, |h| < 1)
divided by the scalar ET sum of
calorimeter towers (ET > 0.1 GeV, |h| < 1)
f
“Toward”
“Transverse”
“Transverse”
“Away”
Jet #1 Direction
f
“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 (|h| < 1)
ETsum = 775 GeV!
“Leading Jet”
Overall Totals versus PT(jet#1)
ETsum = 330 GeV
1000
CDF Run 2 Preliminary
ETsum (GeV)
data corrected
pyA generator level
Jet #1 Direction
f
PTsum (GeV/c)
Average
100
“Overall”
Nchg
"Leading Jet"
MidPoint R=0.7 |h(jet#1)|<2
10
PTsum = 190 GeV/c
Charged Particles (|h|<1.0, PT>0.5 GeV/c)
Stable Particles (|h|<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, |h| < 1) and the overall
scalar pT sum of charged particles (pT > 0.5 GeV/c, |h| < 1) and the overall scalar ET sum of all
particles (|h| < 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 (|h| < 1)
“Leading Jet”
Overall
Number
ofversus
Charged
Particles
Overall
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PTsum
Overall
ETsum
PT(jet#1)
Jet #1 Direction
f
Average
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Average
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(GeV)
Average
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Charged
Particles
400
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 7
“Towards”, “Away”, “Transverse”
“Leading Jet”
Jet #1 Direction
f
“Toward”
“Transverse”
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“Away”
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 8
The “Toward” Region
“Leading Jet”
"Toward"
Charged
Particle
Density:
dN/dhdf
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 9
The “Away” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 10
The “Transverse” Region
“Leading Jet”
Particle
Density:
dN/dhdf
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Charged
PTsum
Density:
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 11
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 12
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 13
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 14
The Leading Jet Mass
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 15
The “Transverse” Region
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 16
The “TransMAX/MIN” Regions
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 17
The “TransMAX/MIN” Regions
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CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 18
The “TransMAX/MIN” Regions
“Leading Jet”
Jet #1 Direction
f
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“leading jet”
jet” events
events as
as aa function
function of
of
of
leading
“transMAX”
region.
corrected
to the
particle
(with
errors
the
leading
jet
ppT pfor
thethe
“transMIN”
region.
TheThe
datadata
are are
corrected
to the
particle
levellevel
(with
errors
thatthat
T for
thethe
leading
jetjet
T for “transDIF” = “transMAX”-”transMIN. The data are corrected to the particle level (with
include
both
the statistical
and the
systematic
and are compared
PYTHIA
A and
errors that
include
both theerror
statistical
error
and the uncertainty)
systematic uncertainty)
and are with
compared
withTune
PYTHIA
HERWIG
MPI)
at the MPI)
particle
levelparticle
(i.e. generator
Tune A and(without
HERWIG
(without
at the
level (i.e.level).
generator level).
CMS Week (Generator Tools)
December 11, 2007
Rick Field – Florida/CDF/CMS
Page 19
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 20