First observation of B̄0→J/ψK+K - and search for B̄0→J/ψφ decays

R. Aaij, 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. Andreassen, J. E. AndrewsR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, 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, 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, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, D. Campora Perez, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, H. Carranza-Mejia, L. Carson, K. Carvalho Akiba, G. Casse, L. Cassina

Resultado de la investigaciónrevisión exhaustiva

17 Citas (Scopus)

Resumen

The first observation of the B ̄0→J/ψK +K - decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb -1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B ̄0→J/ψK +K -)=(2.53±0.31±0.19)×10 -6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B ̄0→J/ψK +K - decay is performed to separate resonant and nonresonant contributions in the K +K - spectrum. Evidence of the a 0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B ̄0→J/ψa 0(980),a 0(980)→K +K -)=(4.70±3.31±0. 72)×10 -7, yielding an upper limit of B(B ̄0→J/ψa 0(980),a 0(980)→K +K -)<9.0×10 -7 at 90% confidence level. No evidence of the resonant decay B ̄0→J/ψφ is found, and an upper limit on its branching fraction is set to be B(B ̄0→J/ψφ)<1.9×10 -7 at 90% confidence level.

Idioma originalEnglish
Número de artículo072005
PublicaciónPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volumen88
N.º7
DOI
EstadoPublished - 14 oct 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 'First observation of B<sup>̄</sup>0→J/ψK<sup>+</sup>K <sup>-</sup> and search for B<sup>̄</sup>0→J/ψφ decays'. En conjunto forman una huella única.

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