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Measurement of CP violation and the B-s(0) meson decay width difference with B-s(0) -> J/psi K+K- and B-s(0) -> J/psi pi(+) pi(-)decays

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Measurement of CP violation and the B-s(0) meson decay width difference with B-s(0) -> J/psi K+K- and B-s(0) -> J/psi pi(+) pi(-)decays

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dc.contributor.author LHCb Collaboration
dc.contributor.author Oyanguren Campos, Arantza
dc.contributor.author Ruiz Valls, Pablo
dc.date.accessioned 2014-03-31T13:06:59Z
dc.date.available 2014-03-31T13:06:59Z
dc.date.issued 2013
dc.identifier.citation LHCb Collaboration Oyanguren Campos, Arantza Ruiz Valls, Pablo 2013 Measurement of CP violation and the B-s(0) meson decay width difference with B-s(0) -> J/psi K+K- and B-s(0) -> J/psi pi(+) pi(-)decays Physical Review D 87 11 112010-1 112010-21
dc.identifier.uri http://hdl.handle.net/10550/33878
dc.description.abstract The time-dependent CP asymmetry in B-s(0) -> J/psi K+ K- decays is measured using pp collision data at root s = 7 TeV, corresponding to an integrated luminosity of 1: 0 fb(-1), collected with the LHCb detector. The decay-time distribution is characterized by the decay widths Gamma(L) and Gamma(H) of the light and heavy mass eigenstates of the B-s(0) ¿ (B) over barB(s)(0) system and by a CP-violating phase s. In a sample of 27 617 B-s(0) -> J/psi K+ K- decays, where the dominant contribution comes from B-s(0) -> J/psi K+ K- decays, these parameters are measured to be phi(s) = 0. 07 +/- 0.09(stat) +/- 0. 01(syst) rad, Gamma(s) equivalent to (Gamma(L) + Gamma(L))/2 = 0.663 +/- 0.005(stat) +/- 0.006(syst) ps(-1), and 0.006(syst) ps(-1), and Delta Gamma(s) equivalent to Gamma(L) ¿ Gamma(L) = 0.100 +/- 0.016(stat) +/- 0.003(syst) ps(-1), corresponding to the single most precise determination of phi(s), Delta Gamma(s), and Gamma(s.). The result of performing a combined analysis with B-s(0) -> J/psi pi(+) pi(-) decays gives phi(s) = 0.01 +/- 0.07(stat) +/- 0.01(syst)rad, Gamma(s) = 0.661 +/- 0.004(stat) +/- 0.006(syst) ps(-1), and Delta Gamma(s) = 0.106 +/- 0.011(stat) +/- 0.007(syst) ps(-1). All measurements are in agreement with the Standard Model predictions.
dc.relation.ispartof Physical Review D, 2013, vol. 87, num. 11, p. 112010-1-112010-21
dc.subject Física nuclear
dc.subject Partícules (Física nuclear)
dc.title Measurement of CP violation and the B-s(0) meson decay width difference with B-s(0) -> J/psi K+K- and B-s(0) -> J/psi pi(+) pi(-)decays
dc.type journal article es_ES
dc.date.updated 2014-03-31T13:06:59Z
dc.identifier.doi 10.1103/PhysRevD.87.112010
dc.identifier.idgrec 094074
dc.rights.accessRights open access es_ES
dc.identifier.url 10.1103/PhysRevD.87.112010

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