论文标题
在未来的Muon Collider上搜索Tau Lepton的Lepton-Fravor-violation腐烂
Search for lepton-flavor-violating decays of the tau lepton at a future muon collider
论文作者
论文摘要
tau leptons可以与muon或电子和轴突样粒子（ALP）具有Lepton-Fravor-violation（LFV）耦合。阿尔卑斯山是与自发损坏的全局u（1）对称性相关的伪nambu-goldstone玻色子。在过去的几十年中，LFV阿尔卑斯山在过去的几十年中引起了极大的兴趣，因为它们可以解决一些持久的问题。假设Muon Accelerator程序（MAP）提出了未来的MUON撞机，我们搜索LFV衰变$τ\ rightarrow \ ell a $（$ \ ell = e，μ$），是Muon-Anti Muon-Muon nihihitation中产生的一个Tau Leptons。假定ALP质量在100 eV到1 MeV范围内，并且考虑了三种不同的手性结构以进行LFV耦合。使用多元技术并基于理想的目标性能执行参数化模拟，我们获得了LFV耦合Tau-Electron-Alp和Tau-Muon-ALP的预期95 $ \％$置信度上限。假设未来Muon对撞机应该在126、350和1500 GEV的质量中心能量，则计算限制。我们研究了两种非偏振和偏振光梁的病例，并表明利用Tau极化诱导的效应，主要背景$τ\ rightarrow e/μ+ barbarν$可以大大降低。结果表明，使用当前分析，可以通过大约一个数量级来改善LFV耦合的当前限制。
Tau leptons can have lepton-flavor-violating (LFV) couplings to a muon or an electron and an Axion-Like Particle (ALP). ALPs are pseudo Nambu-Goldstone bosons associated with spontaneously broken global U(1) symmetries. LFV ALPs have been of a great interest in the last several decades as they can address some of the SM long-lasting problems. Assuming a future muon collider proposed by the Muon Accelerator Program (MAP), we search for LFV decays $τ\rightarrow\ell a$ ($\ell=e,μ$) of one of the tau leptons produced in the muon-anti muon annihilation. The ALP mass is assumed to be in the range 100 eV to 1 MeV and three different chiral structures are considered for the LFV coupling. Using a multivariate technique and performing a parameterized simulation based on the ideal target performance, we obtain expected 95$\%$ confidence level upper limits on the LFV couplings tau-electron-ALP and tau-muon-ALP. Limits are computed assuming the center-of-mass energies of 126, 350 and 1500 GeV which the future muon collider is supposed to operate at. We study the two cases of unpolarized and polarized muon beams and show that taking advantage of tau polarization-induced effects, the main background $τ\rightarrow e/μ+ ν\barν$ can be significantly reduced. Results indicate that current limits on the LFV couplings can be improved by roughly one order of magnitude using the present analysis.
