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001-es BibID:	BIBFORM023399
035-os BibID:	(WoS)000250842100001 (Scopus)36148983425
Első szerző:	The OPAL Collaboration
Cím:	Measurement of the e^+e^ --> W^+W^- cross section and W decay branching fractions at LEP / OPAL Collaboration
Dátum:	2007
ISSN:	1434-6044
Megjegyzések:	From a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. The ratio of the measured cross sections to the Standard Model expectation is found to be: data/SM = 1.002 +- 0.011(stat.) +- 0.007(syst.) +- 0.005(theory), where the uncertainties are statistical, experimental systematics and theory systematics respectively. The data are used to determine the W boson branching fractions, which are found to be consistent with lepton universality of the charged current interaction. Assuming lepton universality, the branching ratio to hadrons is determined to be 67.41 +- 0.37(stat.) +- 0.23(syst.)%, from which the CKM matrix element Vcs is determined to be 0.96+-0.017(stat.)+-0.012(syst.).The differential cross section as a function of the W^- production angle is measured for the qqev and qqmv final states. The results described in this paper are consistent with the expectations from the Standard Model.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	European Physical Journal C. - 52 : 4 (2007), p. 767-785. -
További szerzők:	Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) Dienes Beatrix (1972-) (élettanász, molekuláris biológus)
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