Abstract
The W boson mass is measured using proton-proton collision data at sqrt{s} = 13 TeV corresponding to an integrated luminosity of 1.7 fb−1 recorded during 2016 by the LHCb experiment. With a simultaneous fit of the muon q/pT distribution of a sample of W → μν decays and the ϕ* distribution of a sample of Z → μμ decays the W boson mass is determined to bemw=80354±23stat±10exp±17theory±9PDFMeV,\\documentclass[12pt]{minimal}\t\t\t\t\\usepackage{amsmath}\t\t\t\t\\usepackage{wasysym}\t\t\t\t\\usepackage{amsfonts}\t\t\t\t\\usepackage{amssymb}\t\t\t\t\\usepackage{amsbsy}\t\t\t\t\\usepackage{mathrsfs}\t\t\t\t\\usepackage{upgreek}\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\t\t\t\t\\begin{document}$$ {m}_w=80354\\pm {23}_{\\mathrm{stat}}\\pm {10}_{\\mathrm{exp}}\\pm {17}_{\\mathrm{theory}}\\pm {9}_{\\mathrm{PDF}}\\mathrm{MeV}, $$\\end{document}where uncertainties correspond to contributions from statistical, experimental systematic, theoretical and parton distribution function sources. This is an average of results based on three recent global parton distribution function sets. The measurement agrees well with the prediction of the global electroweak fit and with previous measurements.
Highlights
This paper reports the first measurement of mW with the LHCb experiment
An approximately three times larger data sample is already available for analysis but particular attention should be paid to reducing the dominant source of systematic uncertainty, which is the modelling of W boson production
Summary
The LHCb detector [21, 22] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. Candidate W → μν events are selected online by requiring that one identified muon satisfies the requirements of all stages of the trigger. Candidate J/ψ → μμ and Υ (1S) → μμ events, which are primarily used to calibrate the modelling of the momentum measurement, are required to have a pair of oppositely charged identified muons. Both muons must have a transverse momentum above 3 GeV and satisfy a tighter muon identification requirement. These selections retain roughly 1.0 million Υ (1S) → μμ candidates and 220 thousand J/ψ → μμ candidates
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