arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.12992hep-ph
收藏

Z玻色子衰变中轻子味破坏的现象学研究:含II型跷跷板模型扩展的约束最小超对称标准模型

Phenomenological Study of Lepton Flavor Violation in Z Boson Decays with Constrained MSSM Extended by Type-II Seesaw Model

Erzincan Binali Yıldırım University(埃尔津詹比纳利耶尔德勒姆大学);Al-Furat University(幼发拉底河大学);Idlib University(伊德利卜大学)

Vael Hajahmad, Murhaf Alsayed Ali

AI总结:

本研究在II型跷跷板扩展的CMSSM框架下计算Z玻色子LFV衰变分支比,发现其远低于实验极限,预示未来观测概率极低。

摘要:

在这项工作中,我们在由II型跷跷板模型扩展的约束最小超对称标准模型(CMSSM)框架下研究了Z玻色子衰变中的轻子味破坏(LFV)现象。在该模型中计算了$Z\longrightarrow l_i l_j$衰变的分支比,其中$l_i$和$l_j$是不同味的带电轻子。在拟合中微子和超对称粒子的实验质量极限后,我们发现Z玻色子LFV衰变的分支比对于$e \mu$道约为$6 \times 10^{-10}$,对于$\tau \mu$和$\tau e$衰变道约为$1 \times 10^{-9}$。考虑到近期关于$l_{i}\rightarrow l_{j} \gamma$衰变的实验约束,Z玻色子LFV衰变的分支比在$e \mu$道额外受到$10^{-8}$的抑制,在$\tau \mu$和$\tau e$衰变道额外受到$10^{-3}$的抑制。在两种情形下,理论预言的分支比均比近期实验极限低几个数量级,这使得在未来实验中观测到Z玻色子LFV衰变的概率非常低。

英文摘要:

In this work, we study the lepton flavor violation (LFV) of Z boson decays in the framework of the constrained minimal supersymmetric standard model (CMSSM) extended by the type-II seesaw model. The branching ratios of $Z\longrightarrow l_i l_j$ decays are calculated in this model. Here, $l_i$ and $l_j$ are different flavor charged leptons. After fitting to the experimental mass limits of the neutrino and supersymmetric particles, we have found that the branching ratios for LFV decays of Z boson are in the order of $6 \times {10}^{-10}$ for $e μ$ channel and of $1 \times {10}^{-9}$ for both $τμ$ and $τe$ decay channels. Considering recent experimental constraints on $l_{i}\rightarrow l_{j} γ$ decays, the branching ratios for LFV decays of Z boson get an additional suppression of $10^{-8}$ for $e μ$ channel and of $10^{-3}$ for both $τμ$ and $τe$ decay channels. The branching ratios theoretical predictions are several orders below the recent experimental limits for both scenarios, which give a very low probability to observe the LFV decays of Z boson in the future experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑