First observation of the decay B<inf>s</inf><sup>0</sup> → φ K̄*<sup>0</sup>

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, D. Campora Perez, A. Carbone

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8 Citas (Scopus)

Resumen

The first observation of the decay B s 0 → φK̄* 0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb -1 of pp collisions at √s = 7 TeV, collected with the LHCb detector. A yield of 30 ± 6 B s 0 → (K +K -)(K -π +) decays is found in the mass windows 1012:5 < M(K +K) < 1026:5MeV/c 2 and 746 < M(K -π +) < 1046MeV/c 2. The signal yield is found to be dominated by B s 0 → φK̄* 0 decays, and the corresponding branching fraction is measured to be B(B s 0 → φK̄* 0) = (1:10 ± 0:24 (stat) ± 0:14 (syst) ± 0:08 (f d/f s)) × 10 -6, where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions f d/f s which accounts for the different production rate of B 0 and B s 0 mesons. The significance of B s 0 → φK̄* 0 signal is 6.1 standard deviations. The fraction of longitudinal polarization in B s 0 → φK̄* 0 decays is found to be f 0 = 0:51 ± 0:15 (stat) ± 0:07 (syst). Copyright CERN.

Idioma originalEnglish
Número de artículo92
PublicaciónJournal of High Energy Physics
Volumen2013
N.º11
DOI
EstadoPublished - 1 nov 2013
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Física nuclear y de alta energía

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