A new method to distinguish hadronically decaying boosted <i>Z</i> bosons from <i>W</i> bosons using the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2846 more authors) (2016) A new method to distinguish hadronically decaying boosted <i>Z</i> bosons from <i>W</i> bosons using the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 76 (5). 238-.

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Abstract

The distribution of particles inside hadronic jets produced in the decay of boosted <i>W</i> and <i>Z</i> 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 <i>W</i> or <i>Z</i> boson, this paper presents a technique for further differentiating <i>Z</i> bosons from <i>W</i> bosons. The variables used are jet mass, jet charge, and a <i>b</i>-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 <i>pp</i> collisions with the ATLAS detector at the LHC. For <i>Z</i>-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 <i>Z</i> bosons. However, the modelling of the tagger inputs for boosted <i>W</i> 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.

Item Type: Article
Additional Information: 32 pages plus author list (49 pages total), 19 figures, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2015-02/
Uncontrolled Keywords: Atlas Collaboration, Atlas Collaboration, Atlas Collaboration
Depositing User: Symplectic Admin
Date Deposited: 21 Feb 2017 14:25
Last Modified: 05 Oct 2023 12:06
DOI: 10.1140/epjc/s10052-016-4065-1
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005952