Monte Carlo study of the measurement Michel parameters in radiative decay of tau at Belle
Monte Carlo study of the measurement Michel parameters in radiative decay of tau at Belle
复制标题
Belle tau 辐射衰变测量米歇尔参数的蒙特卡罗研究
DOI：
10.1016/j.nima.2015.12.037
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Nobuhiro Shimizu
中科院分区：
文献类型：
--
作者：
Nobuhiro Shimizu;Nobuhiro Shimizu
米歇尔参数是运动学值，定义为费米相互作用的一般矩阵元素中耦合项的双线性组合，其中包括所有可能的洛伦兹不变标量、向量和张量项。轻子 τ 衰变提供了一个测量米歇尔参数的优秀实验室。这些参数与标准模型期望的任何偏差都将表明新物理学。两个米歇尔参数 η 和 xi κ 只能在辐射轻子衰变中测量。这些参数之前已在 μ 子的辐射衰变中测量过，但尚未在 τ 衰变中测量过。我们报告了 Belle 和 Belle II 辐射轻子 τ 衰变中测量 η 和 xi κ 的可行性研究结果。
Michel parameters are kinematic values defined as bilinear combinations of the coupling terms in the general matrix element of the Fermi interaction where all possible Lorentz-invariant scalar, vector and tensor terms are included. The leptonic τ decays provide an excellent laboratory in which to measure the Michel parameters. Any deviation of these parameters from the Standard Model expectation would indicate New Physics. Two Michel parameters, η¯ and ξ κ, can only be measured in the radiative leptonic decay. These parameters have previously been measured in the radiative decay of the muon but as yet have not been measured in τ decays. We report the results of a feasibility study of the measurement of η¯ and ξ κ in radiative leptonic τ decays at Belle and Belle II.