论文标题
米歇尔（Michel
Michel parameters in the presence of massive Dirac and Majorana neutrinos
论文作者
论文摘要
我们使用最通用的四局有效相互作用的二维相互作用的二维相互作用的二维相互作用，分析了狄拉克和主要中微子对muon和tau瘦素的松性衰变的影响。我们计算最终带电的轻子顿的特定能量和角度分布，包括初始和最终带电的瘦素的极化。我们讨论了新的广义米歇尔参数，并专注于重中微子肿块的影响，这将导致对新的无菌中微子的场景贡献相当大的贡献。具体而言，对于$τ$衰减的情况，最有前途的情况是一个重型的最终状态中微子，质量约为$ 10^2-10^3 $ MEV，线性术语抑制可能是$ 10^{ - 4} $，足以在当前和即将实现的实验中测量。
We analyse the effects of Dirac and Majorana neutrinos on leptonic decays of muon and tau leptons using the most general four-lepton effective interaction Hamiltonian of dimension six. We calculate the specific energy and angular distribution of the final charged lepton, including the polarizations of the initial and final charged leptons. We discuss the new generalized Michel parameters and focus on the effects of the heavy neutrino masses that would lead to sizable contributions on scenarios where the new sterile neutrinos have non-negligible mixing. Specifically, the most promising scenario is found for the case of $τ$ decay with one heavy final-state neutrino with a mass around $10^2 - 10^3$ MeV, where the linear term suppression could be of order $10^{-4}$, low enough to be measured in current and forthcoming experiments.
