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arXiv 0905.1613hep-ex
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LHC的轻子味破坏和B_s轻子末态

Lepton Flavour Violation and B_s Leptonic Final States at the LHC

P. Reznicek

摘要:

本文综述了ATLAS和CMS对B_s轻子衰变的研究,对轻子味破坏现象提供了限制。除了直接轻子味违反末态B_s -> l_1^+ l_2^-外,还可以通过测量B_s -> mu^+ mu^-衰变来设置约束,在某些理论模型中,B_s-> mu^+ mu^-衰变的分支比与B_s -> l_1^+ l_2^-,tau -> 3 mu和其他轻子味违反衰变的分支比相关。本文介绍了B_s -> mu^+ mu^-衰变测量的可行性,包括分支比测量的现状、触发和离线分析策略以及期望达到的目标。ATLAS和CMS实验预计在LHC低光度阶段(30 fb^(-1))结束时提供标准模型B_s -> mu^+ mu^-分支比的3 σ证据。同时给出了τ-> 3 μ衰变的CMS研究和B_s -> τ μ衰变的初始粒子级研究。CMS预测τ-> 3 μ分支比测量的灵敏度为~10^(-8)。

英文摘要:

An overview of ATLAS and CMS studies of B_s leptonic decays providing constraints on the lepton flavour violation phenomenon is presented. Except direct lepton flavour violating final states B_s -> l_1^+ l_2^-, constraints can also be set by a measurement of B_s -> mu^+ mu^- decay, whose branching ratio in some theoretical models correlates with a branching ratio of B_s -> l_1^+ l_2^-, tau -> 3mu and some other lepton flavour violating decays. In this paper, the feasibility of measurements of B_s -> mu^+ mu^- decay is described, including the present status, the trigger and the offline analysis strategies and the expected reach in the branching ratio measurement. The ATLAS and CMS experiments foresee to provide 3-sigma evidence of Standard Model B_s -> mu^+ mu^- branching ratio by the end of LHC low-luminosity stage (30 fb^(-1)). Also a CMS study of the tau -> 3mu decay and an initial particle-level based study of the B_s -> tau mu decay are presented. A sensitivity of ~10^(-8) for the tau -> 3mu branching ratio measurement is predicted by CMS.

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。

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