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Updated Combination of CDF and D0 Results for the Mass of the W Boson

The Tevatron Electroweak Working Group

TL;DR

This paper presents a comprehensive combination of direct $W$ boson mass measurements from the Tevatron's CDF and D0 experiments, integrating data from Run-0, Run-I, and Run-II with a new D0 Run-II result. Using the BLUE method, it standardizes PDF choices and the $W$ width assumption to produce a unified Tevatron average of $M_W = 80{,}420 \pm 31$ MeV, with a detailed breakdown of correlated and uncorrelated uncertainties. The inclusion of the new D0 Run-II data, together with a careful treatment of correlations, yields a world average of $M_W = 80{,}399 \pm 23$ MeV when combined with LEP II results, highlighting Tevatron's competitive precision in testing the electroweak sector. The results have important implications for precision tests of the Standard Model and constrain possible new physics affecting the $W$ mass.

Abstract

We summarize and combine the results on the direct measurements of the mass of the W boson in data collected by the Tevatron experiments CDF and D0 at Fermilab. Results from CDF Run-0 (1988-1889) and Run-I (1992-1995) have been combined with D0 results from Run-I, the CDF 200 pb^(-1) published results from the first period of Run-II (2001-2004) and the recent 1 fb^(-1) result in the electron channel from D0 (2002-2006). The results are corrected for any inconsistencies in parton distribution functions and assumptions about electroweak parameters used in the different analyses. The resulting Tevatron average for the mass of the W boson is M(W) = 80,420+31 MeV.

Updated Combination of CDF and D0 Results for the Mass of the W Boson

TL;DR

This paper presents a comprehensive combination of direct boson mass measurements from the Tevatron's CDF and D0 experiments, integrating data from Run-0, Run-I, and Run-II with a new D0 Run-II result. Using the BLUE method, it standardizes PDF choices and the width assumption to produce a unified Tevatron average of MeV, with a detailed breakdown of correlated and uncorrelated uncertainties. The inclusion of the new D0 Run-II data, together with a careful treatment of correlations, yields a world average of MeV when combined with LEP II results, highlighting Tevatron's competitive precision in testing the electroweak sector. The results have important implications for precision tests of the Standard Model and constrain possible new physics affecting the mass.

Abstract

We summarize and combine the results on the direct measurements of the mass of the W boson in data collected by the Tevatron experiments CDF and D0 at Fermilab. Results from CDF Run-0 (1988-1889) and Run-I (1992-1995) have been combined with D0 results from Run-I, the CDF 200 pb^(-1) published results from the first period of Run-II (2001-2004) and the recent 1 fb^(-1) result in the electron channel from D0 (2002-2006). The results are corrected for any inconsistencies in parton distribution functions and assumptions about electroweak parameters used in the different analyses. The resulting Tevatron average for the mass of the W boson is M(W) = 80,420+31 MeV.

Paper Structure

This paper contains 5 sections, 3 equations, 1 figure, 4 tables.

Table of Contents

  1. Introduction
  2. New data from D0 on $M_{\mathrm{ W }}$
  3. Correlation of the D0 Run II result with other measurements
  4. Combination of Tevatron $M_{\mathrm{ W }}$ measurements
  5. Conclusion

Figures (1)

  • Figure 1: Summary of the measurements of the $W$ boson mass and their average as of July 2009. The result from the Tevatron corresponds to the values in this note (see Table \ref{['tab:MW-inputs09']}) which include corrections to the same $W$ boson width and PDFs. The LEP II result is from Ref. LEPEWWG07. An estimate of the world average of the Tevatron and LEP results assuming no correlations between the Tevatron and LEP is included.