First Measurement of the W Boson Mass in Run II of the Tevatron

TL;DR

This paper reports the most precise measurement to date of the W boson mass using data from Fermilab's Tevatron, achieving high accuracy through analysis of W decay events.

Contribution

First measurement of the W boson mass in Run II of the Tevatron with unprecedented precision, utilizing a large dataset and advanced analysis techniques.

Findings

Measured W boson mass as 80413 ± 48 MeV/c^2

Achieved the most precise single measurement to date

Demonstrated improved accuracy over previous results

Abstract

We present a measurement of the W boson mass using 200/pb of data collected in pbar p collisions at sqrt(s) = 1.96 TeV by the CDF II detector at Run II of the Fermilab Tevatron. With a sample of 63964 W -> e nu candidates and 51128 W -> mu nu candidates, we measure M_W = (80413 +- 34 (stat) +- 34 (syst) = 80413 +- 48) MeV/c^2. This is the most precise single measurement of the W boson mass to date.