From a data sample of 9.98 pb-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 → qq̄) was measured to be 0.660+0.036-0.037 (stat.) ± 0.009(syst.) and the cross-section for the doubly resonant process e+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 → ℓvqq̄ and WW → qq̄qq̄, was determined to be mW = 80.22±0.41(stat.)±0.04(syst.)±0.05(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.

Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Alekseev, G., et al. (1998). Measurement of the W-pair cross-section and of the W mass in e+e- interactions at 172 GeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 2(4), 581-595 [10.1007/s100529800857].

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

Calvi, M.;Paganoni, M.;Ragazzi, S.;Tabarelli, T.;Terranova, F.;
1998

Abstract

From a data sample of 9.98 pb-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 → qq̄) was measured to be 0.660+0.036-0.037 (stat.) ± 0.009(syst.) and the cross-section for the doubly resonant process e+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 → ℓvqq̄ and WW → qq̄qq̄, was determined to be mW = 80.22±0.41(stat.)±0.04(syst.)±0.05(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.
Articolo in rivista - Articolo scientifico
Engineering (miscellaneous); Physics and Astronomy (miscellaneous)
English
1998
2
4
581
595
none
Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Alekseev, G., et al. (1998). Measurement of the W-pair cross-section and of the W mass in e+e- interactions at 172 GeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 2(4), 581-595 [10.1007/s100529800857].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187552
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