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Combination of CDF and D0 results on the W boson mass and width

Tevatron Electroweak Working Group

TL;DR

This work presents a comprehensive BLUE-based combination of direct $M_{ ext{W}}$ and $\Gamma_{ ext{W}}$ measurements from the Tevatron's CDF and DØ experiments, across Run-0, Run-I, and Run-II. It enforces a common PDF framework and SM $\Gamma_{ ext{W}}$ to unify inputs, applies mass-width interdependencies, and accounts for correlated systematics to produce precise Tevatron averages. The resulting values, $M_{ ext{W}}=80432\pm 39$ MeV and $\Gamma_{ ext{W}}=2056\pm 62$ MeV (or $2050\pm 58$ MeV with a preliminary DØ width), are in good agreement with the SM and, when combined with LEP-2, yield world averages that constrain the W-boson properties with high precision. These results reinforce the consistency of the electroweak sector and provide important inputs for global SM fits.

Abstract

The results on the direct measurements of the W-boson mass and width, based on the data collected by the Tevatron experiments CDF and D0 at Fermilab are summarised and combined. The CDF Run-0 (1988-1889) and Run-I (1992-1995) results have been re-averaged using the BLUE method and combined with Run-I D0 results and the latest published results from CDF taken from the first period of Run-II (2001-2004). The results are corrected to have consistency between the parton distribution functions and electroweak parameters. The resulting Tevatron averages for the mass and total decay width of the W boson are: Mw = 80432 +/- 39 MeV and Gamma_W = 2056 +/- 62 MeV. The inclusion of a preliminary Run-II measurement of Gamma_W from D0 gives Gamma_W = 2050 +/- 58 MeV.

Combination of CDF and D0 results on the W boson mass and width

TL;DR

This work presents a comprehensive BLUE-based combination of direct and measurements from the Tevatron's CDF and DØ experiments, across Run-0, Run-I, and Run-II. It enforces a common PDF framework and SM to unify inputs, applies mass-width interdependencies, and accounts for correlated systematics to produce precise Tevatron averages. The resulting values, MeV and MeV (or MeV with a preliminary DØ width), are in good agreement with the SM and, when combined with LEP-2, yield world averages that constrain the W-boson properties with high precision. These results reinforce the consistency of the electroweak sector and provide important inputs for global SM fits.

Abstract

The results on the direct measurements of the W-boson mass and width, based on the data collected by the Tevatron experiments CDF and D0 at Fermilab are summarised and combined. The CDF Run-0 (1988-1889) and Run-I (1992-1995) results have been re-averaged using the BLUE method and combined with Run-I D0 results and the latest published results from CDF taken from the first period of Run-II (2001-2004). The results are corrected to have consistency between the parton distribution functions and electroweak parameters. The resulting Tevatron averages for the mass and total decay width of the W boson are: Mw = 80432 +/- 39 MeV and Gamma_W = 2056 +/- 62 MeV. The inclusion of a preliminary Run-II measurement of Gamma_W from D0 gives Gamma_W = 2050 +/- 58 MeV.

Paper Structure

This paper contains 4 sections, 2 equations, 2 figures, 4 tables.

Table of Contents

  1. Introduction
  2. Mass of the W Boson
  3. Width of the W Boson
  4. Summary

Figures (2)

  • Figure 1: Comparison of the measurements of the W-boson mass and their average. The most recent preliminary result from LEP-2 LEPEWWG07 is also shown. The Tevatron values shown are the corrected values.
  • Figure 2: Comparison of the measurements of the W-boson width and their average. The most recent preliminary result from LEP-2 LEPEWWG07 and the Standard Model prediction are also shown. The Tevatron values shown are the corrected values.