Extraction of the width of the W boson from measurements of σ(pp¯W+X)×B(Weν) and σ(pp¯Z+X)×B(Zee) and their ratio

B. Abbott et al. (DØ Collaboration)
Phys. Rev. D 61, 072001 – Published 3 March 2000
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Abstract

We report on measurements on inclusive cross sections times branching fractions into electrons for W and Z bosons produced in pp¯ collisions at s=1.8TeV. From an integrated luminosity of 84.5 pb1 recorded in 1994–1995 using the DØ detector at the Fermilab Tevatron, we determine σ(pp¯W+X)×B(Weν)=2310±10(stat)±50(syst)±100(lum)pb and σ(pp¯Z+X)×B(Zee)=221±3(stat)±4(syst)±10(lum)pb. From these, we derive σ(pp¯W+X)×B(Weν)/σ(pp¯Z+X)×B(Zee)=10.43±0.15(stat)±0.20(syst)±0.10(NLO), B(Weν)=0.1044±0.0015(stat)±0.0020(syst)±0.0017(theory)±0.0010(NLO), and ΓW=2.169±0.031(stat)±0.042(syst)±0.041(theory)±0.022(NLO)GeV. We use the latter to set a 95% confidence level upper limit on the partial decay width of the W boson into nonstandard model final states, ΓWinv, of 0.213 GeV. Combining these results with those from the 1992–1993 data gives σ(pp¯W+X)×B(Weν)/σ(pp¯Z+X)×B(Zee)=10.51±0.25, ΓW=2.152±0.066GeV, and a 95% C.L. upper limit on ΓWinv of 0.191 GeV. Using a sample with a luminosity of 505 nb1 taken at s=630GeV, we measure σ(pp¯W+X)×B(Weν)=658±67pb.

  • Received 15 June 1999

DOI:https://doi.org/10.1103/PhysRevD.61.072001

©2000 American Physical Society

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Vol. 61, Iss. 7 — 1 April 2000

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