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Tracking the identities of boosted particles

Zhenyu Han

  • Center for the Fundamental Laws of Nature, Harvard University, Cambridge, Massachusetts 02138, USA

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Phys. Rev. D 86, 014026 – Published 25 July, 2012

DOI: https://doi.org/10.1103/PhysRevD.86.014026

Abstract

We show that the tracking system in a collider detector can be used to efficiently identify boosted massive particles from their QCD backgrounds. We examine variables defined with tracking information which are sensitive to jet radiation patterns, including charged particle multiplicity and N-subjettiness. These variables are barely correlated with variables sensitive to the hard splitting scale in the jet, such as the filtered jet mass. Therefore these two kinds of variables should be combined to optimize the discriminating power. We illustrate the method with W jet tagging. It is shown that for jet pT=500  GeV, one can gain a factor of 1.6 in statistical significance by combining filtered jet mass and charged particle multiplicity, over filtered mass alone. Adding N-subjettiness increases the factor to 1.8.

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Outline

Information

Phys. Rev. D 86, 014026– Published 25 July, 2012
  • Received 23 December 2011
Article part of CHORUS

© 2012 American Physical Society

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