The cross-section for the process e(+)e(-) --> W+ W- has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 189 GeV and corresponding to an integrated luminosity of 155 pb(-1). Based on the 2392 events selected as WW candidates, the cross-section for the doubly resonant process e(+)e(-) --> W+W- has been measured to be 15.83 +/- 0.38 (stat) +/- 0.20(syst)pb. The branching fractions of the W decay were also measured and found to be in good agreement with the Standard Model expectation. From these a value of the CKM mixing matrix element \ V-cs\ = 1.001 +/- 0.040 (stat) +/- 0.020(syst) was derived. (C) 2000 Elsevier Science B.V. All rights reserved.

Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (2000). W pair production cross-section and W branching fractions in e+ e- interactions at 189 GeV. PHYSICS LETTERS. SECTION B, 479(1-3), 89-100 [10.1016/S0370-2693(00)00314-2].

W pair production cross-section and W branching fractions in e+ e- interactions at 189 GeV

CALVI, MARTA;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;TERRANOVA, FRANCESCO;
2000

Abstract

The cross-section for the process e(+)e(-) --> W+ W- has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 189 GeV and corresponding to an integrated luminosity of 155 pb(-1). Based on the 2392 events selected as WW candidates, the cross-section for the doubly resonant process e(+)e(-) --> W+W- has been measured to be 15.83 +/- 0.38 (stat) +/- 0.20(syst)pb. The branching fractions of the W decay were also measured and found to be in good agreement with the Standard Model expectation. From these a value of the CKM mixing matrix element \ V-cs\ = 1.001 +/- 0.040 (stat) +/- 0.020(syst) was derived. (C) 2000 Elsevier Science B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
high energy collider; LEP; DELPHI
English
2000
479
1-3
89
100
none
Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (2000). W pair production cross-section and W branching fractions in e+ e- interactions at 189 GeV. PHYSICS LETTERS. SECTION B, 479(1-3), 89-100 [10.1016/S0370-2693(00)00314-2].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/46580
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