Measurement of the W pair cross-section and of the W mass in e+ e- interactions at 172-GeV

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.

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From a data sample of 9.98pb−1 integrated luminosity, collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction Br(W→qqˉ) was measured to be 0.660+0.036−0.037(stat.)±0.009(syst.) and the cross-section for the doubly resonant process \mathrme+e−→W+W− to be 11.58+1.44−1.35(stat.)±0.32(syst.) pb. The mass of the W boson, obtained from direct reconstruction of the invariant mass of the fermion pairs in the decays WW→ℓνqqˉ and WW→qqˉqqˉ , was determined to be mW=80.22±0.41(stat.)±0.04(syst.)\pm0.05(int.)±0.03(LEP)GeV/c2 , where “int.” denotes the uncertainty from interconnection effects like colour reconnection and Bose-Einstein interference. Combined with the W mass obtained from the cross-sections measured by DELPHI at threshold, a value of mW=80.33±0.30(stat.)±0.05(syst.)±0.03(int.)±0.03(LEP)GeV/c2 was found.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1998). Measurement of the W pair cross-section and of the W mass in e+ e- interactions at 172-GeV. European Physical Journal C. Particles and Fields, 2(4), 581-595. https://doi.org/10.1007/s100520050163 (Original work published 1998)