CP asymmetry in the angular distribution of τ → KSπντ decays

被引：16

作者：

Chen, Feng-Zhi ^{[1
]}

Li, Xin-Qiang ^{[1
]}

Yang, Ya-Dong ^{[1
]}

机构：

[1] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Chiral Lagrangians; CP violation; VIOLATION; SEARCH;

D O I：

10.1007/JHEP05(2020)151

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

In this work, we study the C P asymmetry in the angular distribution of tau -> K-S pi nu(tau) decays, taking into account the known C P violation in K-0-(K) over bar (0) mixing. It is pointed out for the first time that, once the well-measured C P violation in the neutral kaon system is invoked, a non-zero C P asymmetry would appear in the angular observable of the decays considered, even within the Standard Model. By employing the reciprocal basis, which is most convenient when a K-S(L) is involved in the final state, the C P -violating angular observable is derived to be two times the product of the time-dependent C P asymmetry in K -> pi(+)pi(-) and the mean value of the angular distribution in tau(+/-)-> K-0((K) over bar (0)) pi(+/-) (V) over bar (T)(V-T)> decays. Compared with the Belle results measured in four different bins of the K pi invariant mass, our predictions lie within the margins of these measurements, except for a 1.7 sigma deviation for the lowest mass bin. While being below the current Belle detection sensitivity that is of O(10(-3)), our predictions are expected to be detectable at the Belle II experiment, where root 70 times more sensitive results will be obtained with a 50 ab(-1) data sample.

引用

页数：18

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