Jet shapes for boosted jet two-prong decays from first-principles

Abstract : Several boosted jet techniques use jet shape variables to discriminate the multi-pronged signal from Quantum Chromodynamics backgrounds. In this paper, we provide a first-principles study of an important class of jet shapes all of which put a constraint on the subjet mass: the mass-drop parameter (µ 2), the N-subjettiness ratio (τ (β=2) 21) and energy correlation functions (C (β=2) 2 or D (β=2) 2). We provide analytic results both for QCD background jets as well as for signal processes. We further study the situation where cuts on these variables are applied recursively with Cambridge-Aachen de-clustering of the original jet. We also explore the effect of the choice of axis for N-subjettiness and jet de-clustering. Our results bring substantial new insight into the nature, gain and relative performance of each of these methods, which we expect will influence their future application for boosted object searches.
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Mrinal Dasgupta, Laís Schunk, Gregory Soyez. Jet shapes for boosted jet two-prong decays from first-principles. Journal of High Energy Physics, Springer, 2016, 2016, pp.166. ⟨10.1007/JHEP04(2016)166⟩. ⟨cea-01464935⟩

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