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Title: W mass and width measurements at the Tevatron

Abstract

I present a measurement of the W boson mass (M{sub W}) and width ({Gamma}{sub W}) using 200 and 350 pb{sup -1} of CDF Run II data respectively. The measurements, performed in both the electron and muon decay channels, rely on a fit to the W transverse mass distribution. We measure M{sub W} = 80413 {+-} 48 MeV and {Gamma}W = 2032 {+-} 71 MeV which represent the world's single most precise measurements to date.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908368
Report Number(s):
FERMILAB-CONF-07-150-E
arXiv eprint number arXiv:0705.2920; TRN: US0703676
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: To appear in the proceedings of 42nd Rencontres de Moriond on QCD and Hadronic Interactions, La Thuile, Italy, 17-24 Mar 2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; ELECTRONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; INTERMEDIATE BOSONS; MASS DISTRIBUTION; MUONS; QUANTUM CHROMODYNAMICS; Experiment-HEP

Citation Formats

Nurse, Emily, and /University Coll. London. W mass and width measurements at the Tevatron. United States: N. p., 2007. Web.
Nurse, Emily, & /University Coll. London. W mass and width measurements at the Tevatron. United States.
Nurse, Emily, and /University Coll. London. Tue . "W mass and width measurements at the Tevatron". United States. doi:. https://www.osti.gov/servlets/purl/908368.
@article{osti_908368,
title = {W mass and width measurements at the Tevatron},
author = {Nurse, Emily and /University Coll. London},
abstractNote = {I present a measurement of the W boson mass (M{sub W}) and width ({Gamma}{sub W}) using 200 and 350 pb{sup -1} of CDF Run II data respectively. The measurements, performed in both the electron and muon decay channels, rely on a fit to the W transverse mass distribution. We measure M{sub W} = 80413 {+-} 48 MeV and {Gamma}W = 2032 {+-} 71 MeV which represent the world's single most precise measurements to date.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Conference:
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  • We discuss the prospects for measuring the W mass and width in Run II. The basic techniques used to measure M{sub W} are described and the statistical, theoretical and detector-related uncertainties are discussed in detail. Alternative methods of measuring the W mass at the Tevatron and the prospects for M{sub W} measurements at other colliders are also described.
  • I describe the latest D0 and CDF W boson mass measurements. The D0 measurement is performed with 4.3 fb{sup -1} of integrated luminosity in the electron decay channel with a data set of 1.68 x 10{sup 8} W candidates. The value of the W boson mass measured by D0 is M{sub W} = 80.375 {+-} 0.023 GeV when combined with the previously analyzed 1 fb{sup -1} of integrated luminosity. The CDF measurement uses 2.2 fb{sup -1} of integrated luminosity in both electron and muon decay channels with a total of 1.1 x 10{sup 8} W candidates. The value of themore » W boson mass measured by CDF is M{sub W} = 80.387 {+-} 0.019 GeV. I report the combination of these two measurements with previous Tevatron measurements and with the LEP measurements of the W boson mass. The new world average is M{sub W} = 80.385 {+-} 0.015GeV. I discuss the implications of the new measurement to the indirect measurement of the Standard Model Higgs boson mass.« less
  • We have made a preliminary determination of the W boson mass, M{sub W} = 80.38 {plus_minus} 0.23 GeV/c{sup 2} from a combined analysis of W {yields} e{nu} in {bar p} collisions at {radical}s = 1.8 TeV. The electron data alone yields M{sub W} = 80.47 {plus_minus} 0.15(stat.) {plus_minus} 0.25(syst.) GeV/c{sup 2}, while the muon data gives M{sub W} = 80.29 {plus_minus} 0.20(stat.) {plus_minus} 0.24(syst.) GeV/c{sup 2}. Measuring the ratio {sigma}{sub W}{center_dot}B(W{yields}e{nu}) / {sigma}{sub Z} {yields} e{sup +}e{sup {minus}}, we have extracted a value for the W width, {Gamma}(W) = 2.063 {plus_minus} 0.061(stat.) {plus_minus} 0.060(syst.) GeV and the branching ratio, {Gamma}(Wmore » {yields} e{nu})/{Gamma}(W) = 0.1094 {plus_minus} 0.0033(stat.) {plus_minus} 0.0031(syst.). This allows us to set a decay mode independent limit on the top quark mass, M{sub top} > 62 GeV/c{sup 2} at the 95% C.L.« less
  • The CDF and D0 Collaborations obtain new measurements of the W boson mass using data taken between 1994 and 1996. CDF updates the previous result obtained from W {yields} {mu}{nu} decays, reducing many systematic uncertainties, and performs a new measurement using a high statistics sample of W {yields} e{nu} events; combining these measurements with the previous ones yields M W CDF =80.433 ± 0.079 GeV/c ². D0 also extends the previous result, based on central electron events, by including events with electrons landed in the forward calorimeters; the combined D0 result is M W D0 = 80.474 ± 0.093 GeV/cmore » &sup 2;. The numbers obtained by the two experiments can be combined together with the older UA2 one (M W UA2 = 80.36 ± 0.37 GeV/c ²), by assuming a 25 MeV/c ² common error, to yield a hadron collider average of M W =80.448 ± 0.062 GeV/c ².« less
  • New measurements of the W boson mass from the two Tevatron experiments, CDF and D0 are presented. The results are from the 1994-1995 Tevatron run, and based on integrated luminosities of 82 pb -1 (D0) and 90 pub -1 (CDF), from p{anti p} collisions at {radical}s=1.8 TeV. These new measurements when combined with previous published measurements yield a Tevatron W mass value of 80.450 ± 0.063 GeV.