Title

Measurement of the top quark mass using events with a single reconstructed top quark in pp collisions at √s = 13 TeV

Document Type

Article

Abstract

A measurement of the top quark mass is performed using a data sample enriched with single top quark events produced in the t channel. The study is based on proton- proton collision data, corresponding to an integrated luminosity of 35.9 fb−1, recorded at s = 13 TeV by the CMS experiment at the LHC in 2016. Candidate events are selected by requiring an isolated high-momentum lepton (muon or electron) and exactly two jets, of which one is identified as originating from a bottom quark. Multivariate discriminants are designed to separate the signal from the background. Optimized thresholds are placed on the discriminant outputs to obtain an event sample with high signal purity. The top quark mass is found to be 172.13−0.77+0.76 GeV, where the uncertainty includes both the statistical and systematic components, reaching sub-GeV precision for the first time in this event topology. The masses of the top quark and antiquark are also determined separately using the lepton charge in the final state, from which the mass ratio and difference are determined to be 0.9952−0.0104+0.0079 and 0.83−1.35+1.79 GeV, respectively. The results are consistent with CPT invariance. [Figure not available: see fulltext.].

Department(s)

Physics and Engineering

Publication Title

Journal of High Energy Physics

Volume

2021

Issue

12

Publication Date

12-1-2021

DOI

10.1007/JHEP12(2021)161

E-ISSN

10298479

Comments

The CMS Collaboration includes over 100 authors. This record includes the Bethel author and the first 5 authors listed. The full list of authors can be viewed on the downloaded document or at the original publisher's website - https://doi.org/10.1007/JHEP12(2021)161

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