First observation of the decay B-s(0) -> phi(K)over-bar*(0)

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

doi:10.1007/Jhep11(2013)092

research article

First observation of the decay B-s(0) -> phi(K)over-bar*(0)

Aaij, R.

•

Beteta, C. Abellan

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Adeva, B.

2013

Journal of High Energy Physics

The first observation of the decay B-s(0) -> phi(K) over bar*(0) is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb(-1) of p p collisions at root s = 7 TeV, collected with the LHCb detector. A yield of 30 +/- 6 B-s(0) -> (K+ K-)(K- pi(+)) decays is found in the mass windows 1012.5 < M (K+ K-) < 1026.5MeV/c(2) and 746 < M (K- pi(+)) < 1046MeV/c(2). The signal yield is found to be dominated by B-s(0) -> phi(K) over bar*(0) decays, and the corresponding branching fraction is measured to be B (B-s(0) (->) phi(K) over bar*(0)) = (1.10 +/- 0.24 (stat) +/- 0.14 (syst) +/- 0.08 (f(d)/f(s))) x 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) ->phi (K) over bar*(0) signal is 6.1 standard deviations. The fraction of longitudinal polarization in B-s(0) -> phi(K) over bar*(0) decays is found to be f(0) = 0.51 +/- 0.15 (stat) +/- 0.07 (syst).