Rare Decays
Rare Decays
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发表时间：
2017-10
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通讯作者：
K. Chen
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作者：
K. Chen
对稀有衰变的研究在探索标准模型之外的物理学方面发挥着重要作用。新粒子可以参与循环过程，并且可以通过查看与标准模型预测的任何偏差来进行探测。通过 CMS 和 LHCb 实验收集的数据观察到非常罕见的衰变 $B_s\to\mu^+\mu^-$。 ATLAS 实验看到的信号不太显着，但与预测相符。测量本身对新的物理模型提供了严格的约束。 LHCb 实验对 $B_s\to\mu^+\mu^-$ 候选对象进行了首次有效寿命测量。仍需要更多数据来观察 $B^0\to\mu^+\mu^-$ 衰减。 $B\to K^*\mu^+\mu^-$ 衰减也通过风味改变中性电流过程进行，并且对新物理很敏感。对 $B\to K^*\mu^+\mu^-$ 衰减进行扩展测量。大多数经典物理参数被发现与预测一致，但一些可观测值中确实出现了紧张。更多数据将有助于澄清这些潜在的偏差。
Studies of rare decays play an important role in the search of physics beyond the standard model. New particles may participate in the loop processes and can be probed by seeing any deviations from the standard model predictions. The very rare decay $B_s\to\mu^+\mu^-$ has been observed with the data collected by CMS and LHCb experiments. The signal seen by the ATLAS experiment is less significant but is compatible with the predictions. The measurement itself provides stringent constraints to new physics models. The first effective lifetime measurement with $B_s\to\mu^+\mu^-$ candidates has been carried out by the LHCb experiment. More data are still required to observe the $B^0\to\mu^+\mu^-$ decays. The $B\to K^*\mu^+\mu^-$ decay also proceeds through a flavour changing neutral current process, and is sensitive to the new physics. Extended measurements are carried out for $B\to K^*\mu^+\mu^-$ decays. Most of the classical physics parameters are found to be consistent with the predictions, but tensions do emerge in some of the observables. More data will help to clarify these potential deviations.