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arXiv 0811.0703hep-ph
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用长寿命Slepton测量LHC的轻子味破坏

Measuring Lepton Flavour Violation at LHC with Long-Lived Slepton in the Coannihilation Region

Satoru Kaneko, Joe Sato, Takashi Shimomura, Oscar Vives, Masato Yamanaka

备注：
20 pages, 5 figures, 4 tables
发表信息：
Phys.Rev.D78:116013,2008
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摘要：

当最轻的slepton（NLSP）和最轻的neutralino（LSP）之间的质量差小于τ质量时，最轻的slepton的寿命相对于其他超对称粒子的典型寿命增加了许多数量级。这些小的质量差异是可能的MSSM，例如，它们对应于共湮灭区的CMSSM为$M_{1/2} \gsim 700$ GeV。在一般的引力介导的MSSM中，最轻的超对称粒子是中性伴子，最轻的slepton的寿命与slepton质量矩阵中代际混合的平方成反比。这样一个长寿的slepton将在LHC中产生一个独特的签名，并且测量其寿命将相对简单。因此，长寿命的slepton方案提供了一个很好的机会，研究轻子味违反ATLAS和CMS探测器在LHC和轻子质量插入边界的改善超过5个数量级将是可能的。

英文摘要：

When the mass difference between the lightest slepton, the NLSP, and the lightest neutralino, the LSP, is smaller than the tau mass, the lifetime of the lightest slepton increases in many orders of magnitude with respect to typical lifetimes of other supersymmetric particles. These small mass differences are possible in the MSSM and, for instance, they correspond to the coannihilation region of the CMSSM for $M_{1/2} \gsim 700$ GeV. In a general gravity-mediated MSSM, where the lightest supersymmetric particle is the neutralino, the lifetime of the lightest slepton is inversely proportional to the square of the intergenerational mixing in the slepton mass matrices. Such a long-lived slepton would produce a distinctive signature at LHC and a measurement of its lifetime would be relatively simple. Therefore, the long-lived slepton scenario offers an excellent opportunity to study lepton flavour violation at ATLAS and CMS detectors in the LHC and an improvement of the leptonic mass insertion bounds by more than five orders of magnitude would be possible.

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