Measurement of the Branching Fractions B(B0→pp¯pp¯) and B(Bs0→pp¯pp¯)
Measurement of the Branching Fractions B(B0→pp¯pp¯) and B(Bs0→pp¯pp¯)
复制标题
支化分数 B(B0–pp–pp–) 和 B(Bs0–pp–pp–) 的测量
DOI：
10.1103/physrevlett.131.091901
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发表时间：
2023
影响因子：
8.6
通讯作者：
Agapopoulou, C.
中科院分区：
文献类型：
--
作者：
Aaij, R.;Abdelmotteleb, A. S. W.;Abellan Beteta, C.;Abudinén, F.;Ackernley, T.;Adeva, B.;Adinolfi, M.;Adlarson, P.;Afsharnia, H.;Agapopoulou, C.
使用 LHCb 实验记录的质子-质子碰撞数据（对应于 9 fb-1 的积分光度）对罕见的强子衰变 B0→ pppp 和 Bs0→ pppp 进行搜索。 B0→ pppp 和 Bs0→ pppp 信号的显着性分别为 9.3 σ 和 4.0 σ，包括统计和系统不确定性。分支分数是相对于拓扑相似的归一化衰减 B0→ J/ψ (→ pp) K* 0 (→ K+ π-) 和 Bs0→ J/ψ (→ pp) φ (→ K+ K-) 来测量的。测得支化率为B(B0→pppp)=(2.2±0.4±0.1±0.1)×10-8和B(Bs0→pppp)=(2.3±1.0±0.2±0.1)×10-8。在这些测量中，第一个不确定性是统计性的，第二个是系统性的，第三个是由于归一化通道的外部分支部分造成的。
Searches for the rare hadronic decays B0→ pppp and Bs0→ pppp are performed using proton-proton collision data recorded by the LHCb experiment and corresponding to an integrated luminosity of 9 fb-1. Significances of 9.3 σ and 4.0 σ, including statistical and systematic uncertainties, are obtained for the B0→ pppp and Bs0→ pppp signals, respectively. The branching fractions are measured relative to the topologically similar normalization decays B0→ J/ψ (→ pp) K∗ 0 (→ K+ π-) and Bs0→ J/ψ (→ pp) φ (→ K+ K-). The branching fractions are measured to be B (B0→ pppp)=(2.2±0.4±0.1±0.1)× 10-8 and B (Bs0→ pppp)=(2.3±1.0±0.2±0.1)× 10-8. In these measurements, the first uncertainty is statistical, the second is systematic, and the third one is due to the external branching fraction of the normalization channel.