A New Method to Distinguish Hadronically Decaying Boosted Bosons from Bosons Using the ATLAS Detector

The distribution of particles inside hadronic jets produced in the decay of boosted and bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted or boson, this paper presents a technique for further differentiating bosons from bosons. The variables used are jet mass, jet charge, and a -tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of [Formula: see text] for bosons in the transverse momentum range 200 GeV [Formula: see text] 400 GeV in [Formula: see text] TeV collisions with the ATLAS detector at the LHC. For -boson tagging efficiencies of [Formula: see text], 50, and [Formula: see text], one can achieve [Formula: see text]-boson tagging rejection factors ([Formula: see text]) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high [Formula: see text], hadronically decaying bosons. However, the modelling of the tagger inputs for boosted bosons is studied in data using a [Formula: see text]-enriched sample of events in 20.3 fb[Formula: see text] of data at [Formula: see text] TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance.