Combination of CDF and D0 W-Boson Mass Measurements

TL;DR

This paper combines multiple measurements of the W boson mass from Fermilab Tevatron experiments CDF and D0, resulting in a highly precise value that enhances the understanding of electroweak physics.

Contribution

It provides a new combined measurement of the W boson mass using the latest data from CDF and D0, improving precision over previous individual results.

Findings

Combined W boson mass: 80,385 ± 15 MeV

Enhanced precision compared to previous measurements

Supports Standard Model consistency

Abstract

We summarize and combine direct measurements of the mass of the $W$ boson in $\sqrt{s} = 1.96 \text{TeV}$ proton-antiproton collision data collected by CDF and D0 experiments at the Fermilab Tevatron Collider. Earlier measurements from CDF and D0 are combined with the two latest, more precise measurements: a CDF measurement in the electron and muon channels using data corresponding to $2.2 \mathrm{fb}^{-1}$ of integrated luminosity, and a D0 measurement in the electron channel using data corresponding to $4.3 \mathrm{fb}^{-1}$ of integrated luminosity. The resulting Tevatron average for the mass of the $W$ boson is $\MW = 80\,387 \pm 16 \text{MeV}$. Including measurements obtained in electron-positron collisions at LEP yields the most precise value of $\MW = 80\,385 \pm 15 \text{MeV}$.