IFAE-Barcelona
Authors
Monica D'Onofrio (donofrio@fnal.gov)
Mario Martínez (mmp@fnal.gov)
Oriol Saltó (salto@fnal.gov)
CDF, FNAL, M.S. 318 P.0. Box 500 Batavia, Illinois 60510 USA
|
Measurement of the Inclusive Jet Cross Sections in
Z/γ*(→e+e-)+jets
Production
(2.5 fb-1 analysis)
Results with 1.7 fb-1 published in Phys. Rev. Lett. 100, 102001
(2008)
We present results on inclusive Z/γ*(→e+e-)+jets
production in p-pbar collisions at √s = 1.96 TeV using data collected with the upgraded
Collider Detector at Fermilab in Run II corresponding to an integrated luminosity of 2.5
fb-1. Jets are reconstructed using the Midpoint algorithm with R=0.7. Measurements
are performed as a function of jet transverse momentum and jet rapidity for jets with
pTjet>30 GeV/c and |yjet|<2.1.
The measurements are corrected to the hadron level and compared to NLO pQCD predictions, the latter
including additional parton-to-hadron non-pQCD contributions.
-
- PRL paper (based on 1.7 fb-1)
T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 100, 102001
(2008)
[PRL figures]
The details of the analysis explained in the paper are also valid for the 2.5 fb-1
results.
- Blessed Results 2.5 fb-1
The measurements are performed in the kinematic range defined as:
- Two electrons with ET > 25 GeV
- At least one central electron: |ηe| < 1.0
- Second electron central or forward : |ηe| < 1.0
or 1.2 < |ηe| < 2.8
- Z mass window: 66 < Mee < 116 GeV/c2
- ΔR(e,jet) > 0.7
Jets are searched for using the MidPoint algorithm with R=0.7.
Measurements are defined for hadron level jets with pTjet > 30
GeV/c and |yjet| < 2.1.
- Inclusive jet cross section in Z/γ*+≥1 jet
and Z/γ*+≥2 jets production as a function of
pTjet
Measured inclusive cross section for Z/γ*+jets
production as a function of pTjet compared to NLO pQCD predictions as
determined using MCFM. The pQCD prediction includes an additional Chad factor that
accounts for non-pQCD contributions. Systematic uncertainties on data and theoretical predictions are
included.
- Inclusive jet cross section in Z/γ*+≥1 jet
and Z/γ*+≥2 jets production in the same plot
gif & eps
- Inclusive jet cross section in Z/γ*+≥1 jet
showing also the Chad factors gif & eps
(Relative contributions to the total systematic uncertainty gif &
eps)
- Inclusive jet cross section in Z/γ*+≥2
jets showing also the Chad factors gif & eps
(Relative contributions to the total systematic uncertainty gif &
eps)
- Nth leading jet cross section in
Z/γ*+≥N jets production as a function of
pTjet
Measured Nth leading jet cross section in
Z/γ*+≥N jets production as a function of
pTjet compared to NLO pQCD predictions as determined using MCFM. The pQCD
prediction includes an additional Chad factor that accounts for non-pQCD
contributions. Systematic uncertainties on data and theoretical predictions are included.
- 1st leading jet in Z/γ*+≥1 jet and 2nd
leading jet in Z/γ*+≥2 jets cross sections in
the same plot gif & eps
- 1st leading jet cross section in Z/γ*+≥1
jet production showing also the Chad factors gif &
eps (Relative contributions to the total systematic uncertainty
gif & eps)
- 2nd leading jet cross section in Z/γ*+≥2
jets production showing also the Chad factors gif &
eps (Relative contributions to the total systematic uncertainty
gif & eps)
- TABLES with CROSS SECTIONS (corresponding to 1.7 fb-1)
- Total Inclusive Cross Section vs Inclusive Jet Multiplicity gif & eps
Measured cross section as a function of inclusive jet multiplicity compared to NLO pQCD predictions
as determined using MCFM. In the ratio plot, data and NLO theory are referred to LO
predictions. Systematic uncertainties on data and theoretical predictions are included.
- σN/σN-1 cross section ratio
gif & eps
Ratio of the total inclusive jet cross section for Z/γ*+≥N jets (σN) over the total
inclusive jet cross section for Z/γ*+≥(N-1) jets
(σN-1).
The plot includes the NLO pQCD predictions (as determined using MCFM) for
σ2/σ1. The pQCD prediction includes an additional Chad
factor that accounts for non-pQCD contributions. Systematic uncertainties on data and
theoretical predictions are included.
- Jet Shapes
Measured differential and integrated jet shapes compared to different Monte Carlo predictions with
different Underlying Event (UE) settings. The data are compared to PYTHIA Tune A, PYTHIA Tune DW and
PYTHIA without UE Monte Carlo predictions.
- Energy Flow gif & eps
Measured energy flow in the transverse plane for Z/γ*+jets events. Event-by-event, φ=0 is defined
along the direction of the Z/γ* boson. The
measurement is performed considering calorimeter towers with |y|<0.7 and compared to
PYTHIA Tune A and PYTHIA Tune DW Monte Carlo predictions. The measurements only include statistical
uncertainties.
- Figures published in the PRL paper based on 1.7
fb-1
- Fig. 1: Inclusive jet cross section in
Z/γ*(→e+e-)+≥1
jet and
Z/γ*(→e+e-)+≥2
jets production as a function of pTjet.
- Figure with "(a)", "(b)" and "(c)" labels
gif & eps
- Figure without the labels
gif & eps
- Fig. 2: Total inclusive cross section as a function of inclusive jet
multiplicity (≥Njets).
- Figure with "(a)" and "(b)" labels
gif & eps
- Figure without the labels
gif & eps
- Additional Blessed Results with 1.7 fb-1
- Inclusive jet cross section in Z/γ*+≥1 jet
and Z/γ*+≥2 jets production as a function of
|yjet|
Measured inclusive cross section for Z/γ*+jets
production as a function of |yjet| compared to NLO pQCD predictions as determined using
MCFM. The pQCD prediction includes an additional Chad factor that accounts for non-pQCD
contributions.
Systematic uncertainties on data and theoretical predictions are included.
- Inclusive jet cross section in Z/γ*+≥1 jet
and Z/γ*+≥2 jets production in the same plot
gif & eps
- Inclusive jet cross section in Z/γ*+≥1 jet
showing also the Chad factors gif & eps (Relative contributions to the total systematic uncertainty gif & eps)
- Inclusive jet cross section in Z/γ*+≥2
jets showing also the Chad factors gif & eps (Relative contributions to the total systematic uncertainty gif & eps)
- Mee mass distribution gif & eps
Measured Mee invariant mass distribution in the region 46 <
Mee < 136 GeV/c2 for data compared to the SM prediction in
events with at least one jet.
The plot includes 20 GeV/c2 sidebands around the defined signal region. The
measurement only includes statistical uncertainties.
- Z/γ*(→e+e-)+4
jets events
We found two Z/γ*(→e+e-)+4
jets events in the 1.7 fb-1 of data used. The details on one of the events are given
below.
- Lego plot of the calorimeter towers gif & eps
- Transverse view of the tracker and the calorimeter towers gif &
eps
-
|