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Título: | 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 |
Autor: | LHCb Collaboration; Aaij, R.; Oyanguren, Arantza CSIC ORCID; Ruiz Valls, Pablo CSIC | Palabras clave: | Distributions Tool |
Fecha de publicación: | 21-jun-2013 | Editor: | American Physical Society | Citación: | Physical Review - Section D - Particles and Fields 87 (11): 112010 - 21 (2013) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevD.87.112010 | URI: | http://hdl.handle.net/10261/126254 | DOI: | 10.1103/PhysRevD.87.112010 | ISSN: | 1550-7998 | E-ISSN: | 1550-2368 |
Aparece en las colecciones: | (IFIC) Artículos |
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Measurement of CP.pdf | 909,09 kB | Adobe PDF | Visualizar/Abrir |
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