Observation of the Decay Ξ_{b}^{-}→pK^{-}K^{-}.
R Aaij,B Adeva,M Adinolfi, Z Ajaltouni,S Akar, J Albrecht, F Alessio, M Alexander,S Ali, G Alkhazov,P Alvarez Cartelle,A A Alves,S Amato,S Amerio,Y Amhis, L An,L Anderlini, G Andreassi,M Andreotti,J E Andrews,R B Appleby, F Archilli, P d'Argent,J Arnau Romeu, A Artamonov,M Artuso, E Aslanides, G Auriemma, M Baalouch,I Babuschkin,S Bachmann, J J Back, A Badalov, C Baesso,S Baker,V Balagura,W Baldini,R J Barlow, C Barschel, S Barsuk,W Barter,M Baszczyk, V Batozskaya, B Batsukh, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, L J Bel, V Bellee, N Belloli,K Belous, I Belyaev, E Ben-Haim, G Bencivenni,S Benson,A Berezhnoy, R Bernet,A Bertolin,C Betancourt, F Betti,M-O Bettler,M van Beuzekom,Ia Bezshyiko, S Bifani, P Billoir,T Bird, A Birnkraut, A Bitadze,A Bizzeti,T Blake,F Blanc,J Blouw,S Blusk,V Bocci, T Boettcher, A Bondar, N Bondar,W Bonivento,I Bordyuzhin, A Borgheresi,S Borghi, M Borisyak,M Borsato, F Bossu, M Boubdir,T J V Bowcock,E Bowen, C Bozzi,S Braun, M 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PHYSICAL REVIEW LETTERS（2017）
引用 18|浏览29
摘要
Decays of the Xi(-)(b) and Omega(-)(b) baryons to the charmless final states ph(-)h'(-), where h((')) denotes a kaon or pion, are searched for with the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies root s = 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb(-1). The decay Xi(-)(b) -> pK(-)K(-) is observed with a significance of 8.7 standard deviations, and evidence at the level of 3.4 standard deviations is found for the Xi(-)(b) -> pK(-)pi(-) decay. Results are reported, relative to the B- -> K+K-K- normalization channel, for the products of branching fractions and b-hadron production fractions. The branching fractions of Xi(-)(b) -> pK(-)pi(-) and Xi(-)(b) -> p pi(-)pi(-) relative to Xi(-)(b) -> pK(-)K(-) decays are also measured.
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