Observation of the decay ? b 0 ? pK - µ + µ - and a search for CP violation
Observation of the decay ? b 0 ? pK - µ + µ - and a search for CP violation
复制标题
观察腐烂情况 ?
DOI：
10.1007/jhep06(2017)108
复制
发表时间：
2017
影响因子：
5.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
提出了在衰减Λ→pK μ μ中寻找CP违背的方法。这种衰变是由标准模型中改变味道的中性电流跃迁介导的，并且对CP违反的新来源可能很敏感。这项研究是基于LHCb实验记录的质子-质子碰撞数据样本，对应于3 fb的综合光度。首次观测到Λ→pK μ μ衰变，并测量了两个对CP违背的不同表现敏感的观测值$$\Delta {\mathcal {A}} _ {CP}\equiv {\mathcal {A}} _ {CP}\left ({\Lambda} _b^ 0\to p {K}^{-}{\mu}^{+}{\mu}^{-}\right)-{\mathcal {A}} _ {CP}\left ({\Lambda} _b^ 0\to p {K}^{-} J/\psi\right) $$和a，其中a是基于μ μ和pK衰变面之间角度的不对称。经测量，没有发现CP违反的证据。
A search for CP violation in the decay Λ→ pK μ μ is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb. The Λ→ pK μ μ decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, $$\Delta {\mathcal {A}} _ {CP}\equiv {\mathcal {A}} _ {CP}\left ({\Lambda} _b^ 0\to p {K}^{-}{\mu}^{+}{\mu}^{-}\right)-{\mathcal {A}} _ {CP}\left ({\Lambda} _b^ 0\to p {K}^{-} J/\psi\right) $$ and a, where the latter is based on asymmetries in the angle between the μ μ and pK decay planes. These are measured to be and no evidence for CP violation is found.