The European Physical Journal C > 2018 > 78 > 2 > 1-61
Measurement of the W-boson mass in pp collisions at $$\sqrt{s}=7\, \hbox {TeV}$$ s=7TeV with the ATLAS detector
Source
Abstract
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 $$4.6~\hbox {fb}^{-1}$$ 4.6fb-1 of integrated luminosity. The selected data sample consists of $$7.8\times 10^6$$ 7.8×106 candidates in the $$W\rightarrow \mu \nu $$ W→μν channel and $$5.9\times 10^6$$ 5.9×106 candidates in the $$W\rightarrow e \nu $$ 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 $$\begin{aligned} \nonumber m_W = 80370&\pm 7~(\text {stat.}) \pm 11 (\text {exp. syst.}) \\&\pm 14~(\text {mod. syst.})~\text {MeV} \\ = 80370&\pm 19\,\text {MeV}, \end{aligned}$$ 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 $$W^+$$ W+ and $$W^-$$ W- bosons yields $$m_{W^+}-m_{W^-} = -\,29 \pm 28$$ mW+-mW-=-29±28 MeV.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-017-5475-4 |