Observation of the ? b 0 ? ? ? decay
Observation of the ? b 0 ? ? ? decay
复制标题
观察？
DOI：
10.1016/j.physletb.2016.05.077
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
在LHCb实验中记录的积分光度为3.0fb−1的数据可以观测到Λ 0 b →Λ衰变。衰变通过一个B→ss的环跃迁在前导级进行，因此对标准模型之外可能存在的粒子很敏感。第一次观察报告的显著性为5.9标准差。测得分支分数的值为（5.18±1.04±0.35+0.67 - 0.62）×10 - 6，其中第一个不确定度是统计性的，第二个是系统性的，第三个与外部输入有关。三重积不对称性被测量为与零一致。
The Λ0b→Λϕ decay is observed using data corresponding to an integrated luminosity of 3.0fb−1 recorded by the LHCb experiment. The decay proceeds at leading order via a b→ss¯s loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of 5.9 standard deviations. The value of the branching fraction is measured to be (5.18±1.04±0.35+0.67−0.62)×10−6, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero.