Measurement of the W-boson mass in pp collisions at s√=7TeV with the ATLAS detector

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A measurement of the mass of the W boson is presented based on proton–proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to 4.6 fb−1 of integrated luminosity. The selected data sample consists of 7.8×106 candidates in the W→μν channel and 5.9×106 candidates in the W→eν channel. The W-boson mass is obtained from template fits to the reconstructed distributions of the charged lepton transverse momentum and of the W boson transverse mass in the electron and muon decay channels, yielding

mW=80370 ±7 (stat.)±11 (exp. syst.)                   ±14 (mod. syst.) MeV
      =80370 ±19MeV,

where the first uncertainty is statistical, the second corresponds to the experimental systematic uncertainty, and the third to the physics-modelling systematic uncertainty. A measurement of the mass difference between the W+ and W bosons yields mW+−mW−=−29±28 MeV.
Original languageEnglish
Article number110
Number of pages61
JournalEuropean Physical Journal C
Issue number2
Publication statusPublished - 6 Feb 2018

Bibliographical note

86 pages in total, author list starting page 70, 30 figures, 13 tables, submitted to EPJC, All figures including auxiliary figures are available at


  • hep-ex


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