Observation of B-(s)(0) -> J/psi p(p)over-bar Decays and Precision Measurements of the B-(s)(0) Masses
Observation of B-(s)(0) -> J/psi p(p)over-bar Decays and Precision Measurements of the B-(s)(0) Masses
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B-(s)(0) -> J/psi p(p)over-bar 衰减的观察和 B-(s)(0) 质量的精确测量
DOI：
10.1103/physrevlett.122.191804
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发表时间：
2019-05
影响因子：
8.6
通讯作者：
Archilli
中科院分区：
文献类型：
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作者：
Aaij R;Beteta C Abellan;Adeva B;Adinolfi M;Aidala C A;Ajaltouni Z;Akar S;Albicocco P;Albrecht J;Alessio F;Alex;er M;Albero A Alfonso;Alkhazov G;Cartelle P Alvarez;Alves A A Jr;Amato S;Amhis Y;An L;Anderlini L;Andreassi G;Andreotti M;Andrews J E;Archilli
使用与 LHCb 探测器收集的积分光度相对应的质子-质子碰撞数据报告了第一次衰变观察。由于可用相空间有限以及 Okubo-Zweig-Iizuka 或 Cabibbo 抑制，这些衰变受到抑制。测得的支化分数为B(B0→J/ψpp̊)=[4.51±0.40(stat)±0.44(syst)]×10-7，B(Bs0→J/ψpp̊)=[3.58±0.19(stat)±0.39(syst)]×10-6。对于themeson来说，这个结果远高于预期值。这些衰变中较小的可用相空间也允许对 themass as 和 themass as 进行最精确的单次测量。
The first observation of the decaysis reported, using proton-proton collision data corresponding to an integrated luminosity of, 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 B(B0→J/ψpp¯)=[4.51±0.40(stat)±0.44(syst)]×10-7, B(Bs0→J/ψpp¯)=[3.58±0.19(stat)±0.39(syst)]×10-6. For themeson, the result is much higher than the expected value of. The small available phase space in these decays also allows for the most precise single measurement of both themass asand themass as.