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2012 Update of the Combination of CDF and D0 Results for the Mass of the W Boson

Tevatron Electroweak Working Group

TL;DR

This work consolidates direct measurements of the $W$ boson mass from the Tevatron’s CDF and D0 experiments, updating previous results with two high-statistics Run-II measurements and a careful treatment of correlations in PDFs, $\Gamma_W$, and radiative corrections. The combination using the BLUE method yields a Tevatron average of $M_W = 80{,}387 \\pm 16$ MeV, and when LEP II data are included, the world average becomes $M_W = 80{,}385 \\pm 15$ MeV. The analysis enhances precision and consistency across experiments, strengthening tests of the Standard Model through a precise $W$-boson mass constraint. The results have direct implications for constraining electroweak parameters and potential new physics affecting $W$-boson properties.

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. Earlier results from CDF Run-0 (1988--1989), D0 and CDF Run-I (1992--1995) and D0 results from 1/fb (2002--2006) of Run-II data are now combined with two new, high statistics Run-II measurements: a CDF measurement in both electron and muon channels using 2.2/fb of integrated luminosity collected between 2002 and 2007, and a D0 measurement in the electron channel using 4.3/fb collected between 2006 and 2009. As in previous combinations, the results are corrected for 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 Mw = 80387 +- 16 MeV and a new world average including data from LEP II is Mw = 80385+- 15 MeV.

2012 Update of the Combination of CDF and D0 Results for the Mass of the W Boson

TL;DR

This work consolidates direct measurements of the boson mass from the Tevatron’s CDF and D0 experiments, updating previous results with two high-statistics Run-II measurements and a careful treatment of correlations in PDFs, , and radiative corrections. The combination using the BLUE method yields a Tevatron average of MeV, and when LEP II data are included, the world average becomes MeV. The analysis enhances precision and consistency across experiments, strengthening tests of the Standard Model through a precise -boson mass constraint. The results have direct implications for constraining electroweak parameters and potential new physics affecting -boson properties.

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. Earlier results from CDF Run-0 (1988--1989), D0 and CDF Run-I (1992--1995) and D0 results from 1/fb (2002--2006) of Run-II data are now combined with two new, high statistics Run-II measurements: a CDF measurement in both electron and muon channels using 2.2/fb of integrated luminosity collected between 2002 and 2007, and a D0 measurement in the electron channel using 4.3/fb collected between 2006 and 2009. As in previous combinations, the results are corrected for 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 Mw = 80387 +- 16 MeV and a new world average including data from LEP II is Mw = 80385+- 15 MeV.

Paper Structure

This paper contains 8 sections, 2 equations, 1 figure, 5 tables.

Table of Contents

  1. Introduction
  2. New measurements
  3. CDF
  4. D0
  5. Combination with older Tevatron measurements
  6. Correlation of the new Run II results with other Tevatron measurements
  7. Combination of Tevatron $M_{\mathrm{ W }}$ measurements
  8. World Average

Figures (1)

  • Figure 1: Summary of the measurements of the $W$ boson mass and their average as of March 2012. The result from the Tevatron corresponds to the values in this note (see Table \ref{['tab:MW-inputs12']}) which include corrections to the same $W$ boson width (2092.2 MeV) 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.