This page provides information and plots for W/Z+jets studies from ATLAS CSC book, as published in

ATLAS Collaboration, Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics, CERN-OPEN-2008-020, Geneva, 2008, to appear.

Production of Jets in Association with Z Bosons


We simulate a measurement of the inclusive Z(->e+e-/m+m-) + jets cross-section with the ATLAS experiment in pp collisions at 14 TeV for an integrated luminosity of 1 fb-1 using fully-simulated signal and background Monte Carlo data sets. The reconstruction of leptons and of missing transverse energy becomes more complex in the presence of a multi-jet final state. We quantify the reconstruction differences with respect to those observed for inclusive Z production. We derive statistical and systematic limitations in terms of probing the perturbative QCD predictions and discriminating between predictions of different event generators.

4 Measurement of Z + jets Cross-Sections

Caption Figure 1: The distribution of the di-muon mass (a) and the inclusive jet multiplicity (b) for signal and backgrounds in the muon channel. In order to provide higher statistics for the background determination, background events in an invariant mass window of 51−131 GeV, are scaled down for an invariant mass window of 81−101 GeV. Also shown is the distribution of pT of the leading (c) and the next-to-leading (d) jet in the electron channel for Ldt = 1 fb-1. The vertical lines in (a), (c) and (d) indicate the kinematic cuts applied in the analysis.

  • (a) Z(mu,mu) invariant mass for signal + background (.eps) (.png):

  • (b) Inclusive jet multiplicity (signal+background) (.eps) (.png):

  • (c) PT leading jet distribution for signal+backgrounds (.eps) (.png):

  • (d) PT 2nd leading jet for signal+backgrounds (.eps) (.png):

Caption Figure 2: Comparison of the distribution of the pT of the leading jet (a) and the next-to-leading jet (b) for the generated (hadron-level) Monte Carlo and for the reconstructed quantities without any correction, after the corrections for electron triggering and reconstruction and after applying in addition the jet-releated corrections.

Major updates:
-- StefanTapprogge - 5 Dec 2008

Responsible: StefanTapprogge
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps 12invmass_new81101.eps r1 manage 17.9 K 2008-12-19 - 12:34 AlessandroTricoli Zmumu Invariant Mass
Unknown file formateps 12njets_new81101.eps r1 manage 12.7 K 2008-12-19 - 12:39 AlessandroTricoli Zmumu njets
Unknown file formateps Ana_Jpt0.eps r1 manage 15.8 K 2008-12-19 - 12:46 AlessandroTricoli Zee pt 1st jet
PNGpng Ana_Jpt0.png r1 manage 15.6 K 2008-12-19 - 12:47 AlessandroTricoli Zee pt 1st jet
Unknown file formateps Ana_Jpt1.eps r1 manage 15.6 K 2008-12-19 - 12:50 AlessandroTricoli Zee pt 2nd jet
PNGpng Ana_Jpt1.png r1 manage 16.0 K 2008-12-19 - 12:50 AlessandroTricoli Zee pt 2nd jet
PNGpng SM_invmass_new81101.png r1 manage 13.4 K 2008-12-19 - 12:34 AlessandroTricoli Zmumu Invariant Mass
PNGpng SM_njets_new81101.png r1 manage 10.4 K 2008-12-19 - 12:40 AlessandroTricoli Zmumu njets
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Topic revision: r2 - 2008-12-19 - AlessandroTricoli
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