Measurement of the Mass and Width of the W Boson in e+e- Collisions at sqrt(s) = 189 GeV

TL;DR

This paper reports a precise measurement of the W boson mass and width using e+e- collision data at 189 GeV, employing direct reconstruction methods and combining results with previous data for improved accuracy.

Contribution

It provides the first measurement of the W boson mass and width at this energy with detailed uncertainty analysis and combines new data with earlier results for enhanced precision.

Findings

W boson mass measured as 80.359 GeV/c2 with uncertainties

W boson width measured as 2.266 GeV/c2 with uncertainties

Results are consistent with the Standard Model predictions

Abstract

A measurement of the W mass and width has been performed by the DELPHI collaboration using the data collected during 1998. The data sample has an integrated luminosity of 155 pb^{-1} and an average centre-of-mass energy of 188.6 GeV. Results are obtained by applying the method of direct reconstruction of the mass of the W from its decay products in both the W+W- -> lvqq and W+W- -> qqqq channels. The W mass result for the 1998 data set is M_W = 80.387 +/- 0.087 (stat) +/- 0.034 (syst) +/- 0.017 (LEP) +/- 0.035 (FSI) GeV/c2, where FSI represents the uncertainty due to final state interaction effects in the qqqq channel, and LEP represents that arising from the knowledge of the beam energy of the accelerator. Combining this result with those previously published by the DELPHI collaboration gives the result M_W = 80.359 +/- 0.074 (stat) +/- 0.032 (syst) +/- 0.017 (LEP) +/- 0.033 (FSI) GeV/c2. The combined value for the W width is \Gamma_W = 2.266 +/- 0.176 (stat) +/- 0.056 (syst) +/- 0.052 (FSI) GeV/c2.