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

Journal article

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 $4.6~\hbox {fb}^{-1}$ of integrated luminosity. The selected data sample consists of $7.8\times 10^6$ candidates in the $W\rightarrow \mu \nu$ channel and $5.9\times 10^6$ candidates in the $W\rightarrow e \nu$ 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 $\begin{aligned} \nonumber m_W = 80370&\pm 7~(\text {stat.}) \pm 11 (\text {exp. syst.}) \\&\pm 14~(\text {mod. syst.})~\text {MeV} \\ = 80370&\pm 19\,\text {MeV}, \end{aligned}$ 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 $m_{W^+}-m_{W^-} = -\,29 \pm 28 MeV$.

Authors: Aaboud, M; Aad, G; Abbott, B; Hays, C; ATLAS Collaboration

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer Verlag
• Journal: European Physical Journal C
• Volume: 78
• Issue: 2
• Article number: 110
• Publication date: 2018-02-06
• Acceptance date: 2017-12-18
• DOI: 10.1140/epjc/s10052-017-5475-4
• EISSN: 1434-6052
• ISSN: 1434-6044
• Keywords: Journal Article