Measurement of jet shapes in top-quark pair events at √s = 7 TeV using the ATLAS detector

  • Brian Cox (Contributor)
  • Cinzia Da Via (Contributor)
  • Alessandra Forti (Contributor)
  • Frederick Loebinger (Contributor)
  • Jiri Masik (Contributor)
  • Alexander Oh (Contributor)
  • Joleen Pater (Contributor)
  • Yvonne Peters (Contributor)
  • Andrew Pilkington (Contributor)
  • Darren Price (Contributor)
  • Yang Qin (Contributor)
  • Savanna Shaw (Contributor)
  • Stephen Watts (Contributor)
  • Terence Wyatt (Contributor)
  • The ATLAS Collaboration (Contributor)



    CERN-LHC. Measurement of the jet shapes in top-quark pair events from proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis uses a data sample of integrated luminosity 1.8 fb-1. Jets are reconstructed using the anti-kT algorithm with jet radius R=0.4. Jet shapes are presented as differential and integrated defined as:
    Differential (RHO) - scalar sum of jet PT in an annulus of thickness deltaR around radius r / scalar sum of jet PT in the cone of radius R.
    Integrated (PSI) - scalar sum of jet PT in cone radius r / scalar sum of jet PT in cone radius R.
    Data are shown separated into b-jets and light-jet events.

    UPDATE (22 JUL 2014): Information on the different sources of systematic uncertainty is given in the following four links, containing tables with the relative values of the uncertainty (in %) for both the differential (Diff) and integrated (Int) versions of the jet shapes for both light- (lJets) and b-jets (bJets). The uncertainties indicated with (Up) and (Down) are asymmetric, while the rest are symmetric on each bin.
    Date made available26 Jul 2013

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