W Mass and Properties

TL;DR

This paper reports precise measurements of the W boson mass and width from Fermilab collider experiments, providing constraints on the Standard Model and potential new physics.

Contribution

It presents the most recent measurements of W boson properties from Tevatron data, refining previous results and testing the Standard Model's predictions.

Findings

W mass measured with 76 MeV uncertainty

W width measured as 2011 +/- 90 (stat) +/- 107 (syst.) MeV

Results constrain Higgs mass and new particles

Abstract

Precise measurements of the mass and width of the W boson are sensitive to radiative corrections and can be used to place limits on new physics beyond the Standard Model and validate the consistency of the model. In particular, the W boson mass constrains the mass of the, as yet unobserved, Higgs boson and the width can be used to place limits on the existence of new particles that couple to the W. Results are presented from proton anti-proton collisions recorded by the CDF and D0 experiments at the Fermilab Tevatron collider, operating at a centre of mass energy of 1.96 TeV. The uncertainty on the W mass is determined to be 76 MeV by CDF and the width, by D0, to be 2011 +/- 90 (stat.) +/- 107 (syst.) MeV.