A Measurement of the W Boson Mass Using Electrons at Large Rapidities

TL;DR

This paper presents a precise measurement of the W boson mass using electron decay channels at large rapidities from proton-antiproton collisions, combining data from multiple runs to improve accuracy.

Contribution

It introduces a novel measurement of the W boson mass at large rapidities and combines it with previous results for enhanced precision.

Findings

Measured W boson mass as 80.691 ± 0.227 GeV

Combined with previous data to find Mw = 80.482 ± 0.091 GeV

Demonstrated the effectiveness of forward electron detection in mass measurement.

Abstract

We report a measurement of the W boson mass based on an integrated luminosity of 82/pb from p-pbar collisions at sqrt(s) = 1.8 TeV recorded in 1994-1995 by the D0 detector at the Fermilab Tevatron. We identify W bosons by their decays to e-nu, where the electron is detected in the forward calorimeters. We extract the mass by fitting the transverse mass and the electron and neutrino transverse momentum spectra of 11,089 W boson candidates. We measure Mw = 80.691 +- 0.227 GeV. By combining this measurement with our previously published central calorimeter results from data taken in 1992-1993 and 1994-1995, we obtain Mw = 80.482 +- 0.091 GeV.