A generic anti-QCD jet tagger
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Aguilar-Saavedra, J. A., Collins, J., & Mishra, R. K. (2017). A generic anti-QCD jet tagger. Journal of High Energy Physics, 2017(11), 163.
SponsorshipThe work of JAAS is supported by MINECO Projects FPA 2016-78220-C3-1-P and FPA 2013-47836-C3-2-P (including ERDF), and by Junta de Andalucía Project FQM-101. The work of JHC and RKM is supported by NSF under Grant No. PHY-1620074 and by the Maryland Center for Fundamental Physics (MCFP).
New particles beyond the Standard Model might be produced with a very high boost, for instance if they result from the decay of a heavier particle. If the former decay hadronically, then their signature is a single massive fat jet which is di cult to separate from QCD backgrounds. Jet substructure and machine learning techniques allow for the discrimination of many speci c boosted objects from QCD, but the scope of possibilities is very large, and a suite of dedicated taggers may not be able to cover every possibility | in addition to making experimental searches cumbersome. In this paper we describe a generic model-independent tagger that is able to discriminate a wide variety of hadronic boosted objects from QCD jets using N-subjettiness variables, with a signi cance improvement varying between 2 and 8. This is in addition to any improvement that might come from a cut on jet mass. Such a tagger can be used in model-independent searches for new physics yielding fat jets. We also show how such a tagger can be applied to signatures over a wide range of jet masses without sculpting the background distributions, allowing to search for new physics as bumps on jet mass distributions.