Tracking the Identities of Boosted Particles

Details Tracking the Identities of Boosted Particles Tracking the Identities of Boosted Particles

2011-12-14

arxiv.org/abs/1112.3378v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 9 figures

Scientific paper

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 multiplicity, over filtered mass alone. Adding N-subjettiness increases the factor to 1.8.

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