A measurement of the mass of the W boson is presented based on protonâproton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to 4.6fb-1 of integrated luminosity. The selected data sample consists of 7.8 à 106candidates in the Wâ μν channel and 5.9 à 106candidates in the Wâ 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 (Formula presented.) 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.
Measurement of the W-boson mass in pp collisions at âs=7TeV with the ATLAS detector
Capua, M.;Crosetti, G.;Mastroberardino, A.Membro del Collaboration Group
;Meoni, E.;Schioppa, M.;Tassi, E.;
2018-01-01
Abstract
A measurement of the mass of the W boson is presented based on protonâproton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to 4.6fb-1 of integrated luminosity. The selected data sample consists of 7.8 à 106candidates in the Wâ μν channel and 5.9 à 106candidates in the Wâ 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 (Formula presented.) 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
