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

Research output: Contribution to journalJournal article

  • ATLAS Collaboration
Article number110
<mark>Journal publication date</mark>6/02/2018
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number2
Number of pages61
<mark>Original language</mark>English


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 7.8×10 6 candidates in the W→μν channel and 5.9×10 6 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±19 MeV,
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

EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0