Scrutinizing CKM unitarity with a new measurement of the K3/K2 branching fraction

Scrutinizing CKM unitarity with a new measurement of the K3/K2 branching fraction
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通过 K3/K2 支化分数的新测量来检查 CKM 单一性

DOI:
10.1016/j.physletb.2023.137748
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发表时间:
2023
期刊:
影响因子:
4.4
通讯作者:
Moulson, Matthew
Moulson, Matthew
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cirigliano, Vincenzo;Crivellin, Andreas;Hoferichter, Martin;Moulson, Matthew

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Cabibbo-Kobayashi-Maskawa矩阵的第一行一致性的精度测试目前显示了两个有趣的张力,都在3σ水平。首先,结合超允许β衰变的V u d和kaon衰变的V u s的测定表明,在统一关系中存在缺陷。同时,在k2和k3衰变之间也出现了同样重要的张力。在这封信中,我们指出,在0.2%的水平上测量K μ 3/K μ 2分支分数将对澄清kaon部门的实验情况有相当大的影响,特别是考虑到kaon数据的全局拟合的紧张以及K μ 2通道目前由单一实验主导的事实。这样的测量,例如在NA62,将进一步提供超越标准模型的重要物理约束,最显著的是右手矢量电流的作用。
Precision tests of first-row unitarity of the Cabibbo–Kobayashi–Maskawa matrix currently display two intriguing tensions, both at the 3σ level. First, combining determinations of V u d from superallowed β decays with V u s from kaon decays suggests a deficit in the unitarity relation. At the same time, a tension of similar significance has emerged between K ℓ 2 and K ℓ 3 decays. In this Letter, we point out that a measurement of the K μ 3/K μ 2 branching fraction at the level of 0.2% would have considerable impact on clarifying the experimental situation in the kaon sector, especially in view of tensions in the global fit to kaon data as well as the fact that the K μ 2 channel is currently dominated by a single experiment. Such a measurement, as possible for example at NA62, would further provide important constraints on physics beyond the Standard Model, most notably on the role of right-handed vector currents.
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DOI: --
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