Improved W boson mass measurement with the DØ detector

Le résumé fourni par la source

We have measured the W boson mass using the D\O{} detector and a data sample of $82 {\mathrm{pb}}^{\ensuremath{-}1}$ from the Fermilab Tevatron collider. This measurement uses $\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu}$ decays, where the electron is close to a boundary of a central electromagnetic calorimeter module. Such ``edge'' electrons have not been used in any previous D\O{} analysis, and represent a 14% increase in the W boson sample size. For these electrons, new response and resolution parameters are determined, and revised backgrounds and underlying event energy flow measurements are made. When the current measurement is combined with previous D\O{} W boson mass measurements, we obtain ${M}_{W}=80.483\ifmmode\pm\else\textpm\fi{}0.084 \mathrm{GeV}.$ The 8% improvement from the previous D\O{} measurement is primarily due to the improved determination of the response parameters for non-edge electrons using the sample of Z bosons with non-edge and edge electrons.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.