# Top-Tagging: A Method for Identifying Boosted Hadronic Tops

 Title: Top-Tagging: A Method for Identifying Boosted Hadronic Tops Author: Kaplan, David; Rehermann, Keith; Tweedie, Brock; Schwartz, Matthew D Note: Order does not necessarily reflect citation order of authors. Citation: Kaplan, David, Keith Rehermann, Matthew Schwartz, and Brock Tweedie. 2008. Top-Tagging: A method for identifying boosted hadronic tops. Physical Review Letters 101(14): 142001. Full Text & Related Files: 0806.0848v2.pdf (149.5Kb; PDF) Abstract: 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 $$p_T \simeq$$ 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 $$t\bar{t}$$ resonances by a factor of ~10,000, thereby allowing resonance searches in $$t\bar{t}$$ to be extended into the all-hadronic channel. In addition, top-tagging can be used in $$t\bar{t}$$ events when one of the tops decays semi-leptonically, in events with missing energy, and in studies of b-tagging efficiency at high $$p_T$$. Published Version: doi:10.1103/PhysRevLett.101.142001 Other Sources: http://arxiv.org/abs/0806.0848 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8002102

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Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University