论文标题
搜索稀有的HADRONIC DECAY $ B_S^0 \ to P \ bar {p} $
Search for the rare hadronic decay $B_s^0\to p \bar{p}$
论文作者
论文摘要
搜索使用LHCB实验记录的Proton-Proton碰撞数据在13 TEV的中心能量中记录的Proton-Proton碰撞数据进行搜索$ b_s^0 \至p \ bar {p} $，对应于6 fb $^{ - 1} $的集成亮度。找不到衰减的证据，其分支分数的上限设置为$ {\ cal b}（b_s^0 \ to p \ bar {p}）<4.4〜（5.1）\ times 10^{ - 9} $在90％（95％）置信度;目前，这是世界上最好的上限。 The decay mode $B^0\to p \bar{p}$ is measured with very large significance, confirming the first observation by the LHCb experiment in 2017. The branching fraction is determined to be ${\cal B}(B^0\to p \bar{p}) = \rm (1.27 \pm 0.15 \pm 0.05 \pm 0.04) \times 10^{ - 8} $，其中第一个不确定性是统计的，第二个是系统的，第三是由于标准化通道的外部分支$ b^0 \ to K^+π^ - $。 $ b^0 \至p \ bar {p} $分支分数的两个LHCB测量的组合产生$ {\ cal b}（b^0 \ to p \ bar {p}）= \ rm（1.27 \ pm 0.13 \ pm 0.13 \ pm 0.05 \ pm 0.05 \ pm 0.05 \ pm 0.03 \ pm 0.03 \ pm 0.03）
A search for the rare hadronic decay $B_s^0\to p \bar{p}$ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. No evidence of the decay is found and an upper limit on its branching fraction is set at ${\cal B}(B_s^0\to p \bar{p}) < 4.4~(5.1) \times 10^{-9}$ at 90% (95%) confidence level; this is currently the world's best upper limit. The decay mode $B^0\to p \bar{p}$ is measured with very large significance, confirming the first observation by the LHCb experiment in 2017. The branching fraction is determined to be ${\cal B}(B^0\to p \bar{p}) = \rm (1.27 \pm 0.15 \pm 0.05 \pm 0.04) \times 10^{-8}$, where the first uncertainty is statistical, the second is systematic and the third is due to the external branching fraction of the normalization channel $B^0\to K^+π^-$. The combination of the two LHCb measurements of the $B^0\to p \bar{p}$ branching fraction yields ${\cal B}(B^0\to p \bar{p}) = \rm (1.27 \pm 0.13 \pm 0.05 \pm 0.03) \times 10^{-8}$.
