Typ

CONF-Note

Gebiet

ATLAS

Autor

G. Aad, …, P. König, P. Bechtle, K. Desch et al. (für die ATLAS-Kollaboration)

Titel

Improved W boson Mass Measurement using 7 TeV Proton-Proton Collisions with the ATLAS Detector

Datum

2023-03

Reportnummer

ATLAS-CONF-2023-004

Kurzfassung

The W boson mass is one of the most interesting fundamental parameters of the Standard Model of particle physics, as it allows for model-independent probes for effects of new physics. In this work, proton-proton data recorded by the ATLAS detector in 2011, at a center of mass energy of 7TeV , that were used for the first W boson mass measurement at the LHC, have been reanalyzed with an advanced fitting technique based on a profile likelihood approach. This allows for a reduction of several systematic uncertainties. Advances in the modelling of the parton density functions of the proton in recent years have been taken into account and a more modern PDF set has been chosen as baseline. The updated measurement yields a preliminary value of mW=80360±5(stat.)±15(syst.)=80360±16MeV , where the first uncertainty component is statistical and the second corresponds to the experimental and physics-modelling systematic uncertainty. This result is compatible with the published value and its uncertainty improved by 15%.

Link

http://cds.cern.ch/record/2853290