The emergence of the ΔU = 0 rule in charm physics
The emergence of the ΔU = 0 rule in charm physics
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DOI：
10.1007/jhep07(2019)020
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发表时间：
2019-03
影响因子：
5.4
通讯作者：
Y. Grossman;S. Schacht
中科院分区：
文献类型：
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作者：
Y. Grossman;S. Schacht
我们讨论了LHCb在两体SCS D衰变中最近发现的CP违逆的意义。我们证明，结果可以在SM内解释，而不需要任何大的SU(3)断裂效应。它进一步能够确定粲衰中ΔU= 0 / ΔU= 1矩阵元素比值的虚部，我们发现它为（0.65±0.12）。在标准模型中，结果证明了粲衰中树算子的企鹅收缩的非摄动性质，类似于已知的在kaon衰中ΔI= 1/2对ΔI= 3/2矩阵元素的非摄动增强，即ΔI= 1/2规则。作为未来测量的指导，我们展示了如何完全解决D→P+ P−系统的最一般参数化。
We discuss the implications of the recent discovery of CP violation in two-body SCS D decays by LHCb. We show that the result can be explained within the SM without the need for any large SU (3) breaking effects. It further enables the determination of the imaginary part of the ratio of the ΔU= 0 over ΔU= 1 matrix elements in charm decays, which we find to be (0.65±0.12). Within the standard model, the result proves the non-perturbative nature of the penguin contraction of tree operators in charm decays, similar to the known non-perturbative enhancement of ΔI= 1/2 over ΔI= 3/2 matrix elements in kaon decays, that is, the ΔI= 1/2 rule. As a guideline for future measurements, we show how to completely solve the most general parametrization of the D→ P+ P− system.