Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at √s = 8 TeV

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at √s = 8 TeV. European physical journal. C - particles and fields, 76(3) EDP Sciences 10.1140/epjc/s10052-016-3978-z

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This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20fb⁻¹ of proton-proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy √s=8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50% efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2-4% for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques.

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