Top-tagging: A Method for Identifying Boosted Hadronic Tops

Details Top-tagging: A Method for Identifying Boosted Hadronic Tops Top-tagging: A Method for Identifying Boosted Hadronic Tops

2008-06-05

arxiv.org/abs/0806.0848v2

Phys.Rev.Lett.101:142001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures; v2: separate quark and gluon efficiencies included, figure on helicity angle added, and physics discussion

Scientific paper

10.1103/PhysRevLett.101.142001

A method is introduced for distinguishing top jets (boosted, hadronically decaying top quarks) from light quark and gluon jets using jet substructure. The procedure involves parsing the jet cluster to resolve its subjets, and then imposing kinematic constraints. With this method, light quark or gluon jets with pT ~ 1 TeV can be rejected with an efficiency of around 99% while retaining up to 40% of top jets. This reduces the dijet background to heavy t-tbar resonances by a factor of ~10,000, thereby allowing resonance searches in t-tbar to be extended into the all-hadronic channel. In addition, top-tagging can be used in t-tbar events when one of the tops decays semi-leptonically, in events with missing energy, and in studies of b-tagging efficiency at high pT.

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