First measurement of the W boson mass with the ATLAS detector

par M. Oleh Kivernyk (LAPP)

vendredi 7 avr. 2017, 14:00 → 15:00 Europe/Paris

Auditorium

With the discovery of the Higgs boson and the measurement of its mass, the electroweak sector of the Standard Model is over-constrained. A precise measurement of the W-boson mass is an important ingredient to test the self-consistency of the Standard Model in context of the global fit to the SM parameters. Any deviation from the theory would be an indication of new physics. Recently, the ATLAS collaboration reported the first measurement of the W-boson mass at the LHC based on proton-proton collisions at a center-of-mass energy of 7 TeV recorded in 2011. The result is determined using template fits to the transverse momentum distributions of the charged lepton as well as the transverse mass distributions of W-bosons in the electron and muon decay channels. The measured value matches the precision of the current best single measurement performed by the CDF experiment. The final result is compared to the current world average and interpreted in the context of the global electroweak fit.

Slides seminar.pdf