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

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Colleges, School and Institutes


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.

Bibliographic 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


Original languageEnglish
Article number110
Number of pages61
JournalEuropean Physical Journal C
Issue number2
Publication statusPublished - 6 Feb 2018


  • hep-ex