Measurement of CP violation and the Bs0 meson decay width difference with Bs0→J/ψK+K- and Bs0→J/ψπ +π - Decays

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. AndreassenR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J. J. Back, C. Baesso, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, Th Bauer, A. Bay, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M. O. Bettler, M. Van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P. M. Bjørnstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T. J.V. Bowcock, E. Bowen, C. Bozzi, T. Brambach, J. Van Den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N. H. Brook, H. Brown, I. Burducea, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, H. Carranza-Mejia, L. Carson, K. Carvalho Akiba, G. Casse

Resultado de la investigaciónrevisión exhaustiva

115 Citas (Scopus)

Resumen

The time-dependent CP asymmetry in Bs0→J/ψK +K - decays is measured using pp collision data at √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 Γ L and Γ H of the light and heavy mass eigenstates of the Bs0-B̄s0 system and by a CP-violating phase s. In a sample of 27 617 Bs0→J/ψK +K - decays, where the dominant contribution comes from Bs0→J/ψ decays, these parameters are measured to be s=0.07±0.09(stat) ±0.01(syst) rad, Γ s≡(Γ LH)/2=0.663±0.005(stat)±0.006(syst) ps -1, and ΔΓ s≡Γ LH=0. 100±0.016(stat)±0.003(syst) ps -1, corresponding to the single most precise determination of s, ΔΓ s, and Γ s. The result of performing a combined analysis with Bs0→J/ψπ +π - decays gives s=0.01±0.07(stat)±0.01(syst) rad, Γ s= 0.661±0.004(stat)±0.006(syst) ps -1, and ΔΓ s=0.106±0.011(stat)±0.007(syst) ps -1. All measurements are in agreement with the Standard Model predictions.

Idioma originalEnglish
Número de artículo112010
PublicaciónPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volumen87
N.º11
DOI
EstadoPublished - 21 jun 2013
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Huella Profundice en los temas de investigación de 'Measurement of CP violation and the Bs0 meson decay width difference with Bs0→J/ψK<sup>+</sup>K<sup>-</sup> and Bs0→J/ψπ <sup>+</sup>π <sup>-</sup> Decays'. En conjunto forman una huella única.

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