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Measurement of the $W$-boson mass in pp collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

Journal article published in 2017 by R. E. Ticse Torres, Morad Aaboud, Georges Aad ORCID, Brad Abbott, Jalal Abdallah, Ovsat Abdinov, Baptiste Abeloos, Syed Haider Abidi, Ossama AbouZeid, Nicola Abraham, Halina Abramowicz, Henso Abreu, Ricardo Abreu, Yiming Abulaiti, Bobby Samir Acharya and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

See paper for full list of authors - 86 pages in total, author list starting page 70, 30 figures, 13 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-18 ; 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 $7.8 \times 10^6$ candidates in the $W→ μ ν$ channel and $5.9 \times 10^6$ candidates in the $W→ e ν$ 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 \begin{eqnarray} m_W &=& 80370 ± 7 \, (\textrm{stat.}) ± 11 \, (\textrm{exp. syst.}) ± 14 \, (\textrm{mod. syst.}) \, \textrm{MeV} &=& 80370 ± 19 \, \textrm{MeV}, \end{eqnarray} 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 $m_{W^+}-m_{W^-} = -29 ± 28$ MeV.