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001-es BibID:	BIBFORM120084
035-os BibID:	(Scopus)85130262791 (WoS)000810464600004
Első szerző:	Tumasyan, Armen
Cím:	Precision measurement of the W boson decay branching fractions in proton-proton collisions at root{s} = 13 TeV / A. Tumasyan, CMS Collaboration
Dátum:	2022
ISSN:	2470-0010 2470-0029
Megjegyzések:	The leptonic and inclusive hadronic decay branching fractions of the W boson are measured using proton-proton collision data collected at root{s} = 13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb^-1. Events characterized by the production of one or two W bosons are selected and categorized based on the multiplicity and flavor of reconstructed leptons, the number of jets, and the number of jets identified as originating from the hadronization of b quarks. A binned maximum likelihood estimate of the W boson branching fractions is performed simultaneously in each event category. The measured branching fractions of the W boson decaying into electron, muon, and tau lepton final states are (10.83+/-0.10)%, (10.94+/-0.08)%, and (10.77+/-0.21)%, respectively, consistent with lepton flavor universality for the weak interaction. The average leptonic and inclusive hadronic decay branching fractions are estimated to be (10.89+/-0.08)% and (67.32+/-0.23)%, respectively. Based on the hadronic branching fraction, three standard model quantities are subsequently derived: the sum of squared elements in the first two rows of the Cabibbo-Kobayashi-Maskawa (CKM) matrix [sigma]_{ij}\|V_{ij}\|^2 = 1.984+/-0.021, the CKM element \|V_{cs}\|=0.967+/-0.011, and the strong coupling constant at the W boson mass scale, [alfa]_s(m^W_2)=0.095+/-0.033.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Physical Review D. - 105 : 7 (2022), p. 1-31. -
További szerzők:	Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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