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CP asymmetries in the rare top decays t→cγ and t→cg

机译：CP在罕见的顶部衰变中的不对称T→Cγ和T→CG

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摘要

The rare radiative flavor changing top decays t → c γ and t → c g (and the even rarer t → u γ and t → u g ) have been processes of interest for decades as they offer a key probe for studying top quark properties. However, an explicit analytical study of the branching ratios and C P asymmetries resulting from these loop level processes has thus far evaded attention. In this work, we provide the formulation for the C P asymmetry resulting from the total kinetic contribution of the loop integrals and their imaginary parts, as well as an updated numerical computation of the predicted Standard Model (SM) branching fractions. These rare processes are suppressed in the SM by the Glashow-Iliopoulos-Maiani mechanism. However, the results presented here can easily be exported for use in minimal extensions of the SM including vectorlike quarks or in two-Higgs-doublet models where radiative fermionic decay processes can be enhanced relative to the SM by several orders of magnitude. Such processes provide an experimentally clean signature for new fundamental physics and can potentially be tested by current collider experiments. These topical beyond the SM theories are an elegant means to provide improved global fits to the latest results emerging from flavor physics, Cabibbo-Kobayashi-Maskawa, and precision electroweak measurements.
机译：罕见的辐射风味改变顶部衰减T→Cγ和T→C G（以及偶数罕见的T→Uγ和T→U G）几十年来的流程，因为它们为研究顶部夸克属性提供了一个关键探头。然而，由于这些环路级工艺产生的分支比和C P不对称的显性分析研究已经远远疏散。在这项工作中，我们提供了由环路积分的总动力学贡献和它们的虚部的总动力学贡献，以及预测标准模型（SM）支化分数的更新数值计算的C P不对称性的配方。通过Glashow-Iliopoulos-Maiani机制在SM中抑制了这些罕见的方法。然而，这里呈现的结果可以很容易地导出用于SM的最小扩展，包括矢量夸克，或者在两个HIGGS-DOPBLET模型中，可以通过几个数量级相对于SM提高辐射FERIVION衰减过程。此类过程为新的基本物理提供了一种实验清洁签名，并且可能通过当前的碰撞器实验进行测试。这些局部超出SM理论是一种优雅的手段，可以提供改进的全球符合来自风味物理，Cabibbo-Kobayashi-Maskawa和精密电挖掘测量的最新结果。

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