Measurement of the W boson mass

LHCb Collaboration

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The W boson mass is measured using proton-proton collision data at 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 be

mw= 80354 ± 23 stat± 10 exp± 17 theory± 9 PDFMeV,

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. 

Original languageEnglish
Article number36
Number of pages38
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 10 Jan 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).


  • Electroweak interaction
  • Forward physics
  • Hadron-Hadron scattering (experiments)
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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