A measurement of the W boson mass using large rapidity electrons

TL;DR

This paper reports a precise measurement of the W boson mass using electron decay data from the D0 experiment, combining forward and central calorimeter results to improve accuracy.

Contribution

It introduces a novel measurement of the W boson mass utilizing forward calorimeter data and combines it with previous results for enhanced precision.

Findings

Measured W boson mass as 80.691 ± 0.227 GeV from forward calorimeter data.

Combined W boson mass result is 80.482 ± 0.091 GeV.

Demonstrated improved measurement accuracy by integrating different detector regions.

Abstract

We present a measurement of the W boson mass using data collected by the D0 experiment at the Fermilab Tevatron during 1994--1995. We identify W bosons by their decays to e-nu final states where the electron is detected in a forward calorimeter. We extract the W boson mass, Mw, by fitting the transverse mass and transverse electron and neutrino momentum spectra from a sample of 11,089 W -> e nu decay candidates. We use a sample of 1,687 dielectron events, mostly due to Z -> ee decays, to constrain our model of the detector response. Using the forward calorimeter data, we measure Mw = 80.691 +- 0.227 GeV. Combining the forward calorimeter measurements with our previously published central calorimeter results, we obtain Mw = 80.482 +- 0.091 GeV.