Observation of B_{(s)}^{0}→J/ψpp[over ¯] Decays and Precision Measurements of the B_{(s)}^{0} Masses.
R Aaij,C Abellán Beteta,B Adeva,M Adinolfi,C A Aidala, Z Ajaltouni,S Akar,P Albicocco,J Albrecht, F Alessio, M Alexander,A Alfonso Albero, 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, F Archilli,J Arnau Romeu, A Artamonov,M Artuso, K Arzymatov, E Aslanides,M Atzeni, B Audurier,S Bachmann, J J Back,S Baker,V Balagura,W Baldini,A Baranov,R J Barlow, G C Barrand, S Barsuk,W Barter,M Bartolini,F Baryshnikov, V Batozskaya, B Batsukh, A Battig, V Battista, A Bay, J Beddow,F Bedeschi, I Bediaga, A Beiter, L J Bel,S Belin, N Beliy, V Bellee, N Belloli,K Belous, I Belyaev, G Bencivenni, E Ben-Haim,S Benson,S Beranek,A Berezhnoy, R Bernet, D Berninghoff, E Bertholet,A Bertolin,C Betancourt,F Betti, M O Bettler,Ia Bezshyiko,S Bhasin, J Bhom,M S Bieker,S Bifani, P Billoir, A Birnkraut,A Bizzeti,M Bjørn,M P Blago,T Blake,F Blanc,S Blusk, D Bobulska,V Bocci,O Boente Garcia, T Boettcher, A Bondar, N Bondar,S Borghi,M 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PHYSICAL REVIEW LETTERS（2019）
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摘要
The first observation of the decays B-(s)(0) -> J/psi p (p) over bar is reported, using proton-proton collision data corresponding to an integrated luminosity of 5.2 fb(-1), collected with the LHCb detector. These decays are suppressed due to limited available phase space, as well as due to Okubo-Zweig-Iizuka or Cabibbo suppression. The measured branching fractions are beta(B-(s)(0) -> J/psi p (p) over bar). [4.51 +/- 0.40(stat)+/- 0.44(syst)] x 10(-7), BB(s)0 -> J/psi p (p) over bar) = 3.58 +/- 0.19(stat) 0.39(syst)] x 10(-6). For the B-s(0) meson, the result is much higher than the expected value of O(10(-9)). The small available phase space in these decays also allows for the most precise single measurement of both the B-0 mass as 5279.74 +/- 0.30(stat) 0.10(syst) MeV and the B-s(0) mass as 5366.85 +/- 0.19(stat) +/- 0.13(syst) MeV.
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