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arXiv 0902.2123hep-ph
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共湮灭区的长寿命Slepton和LHC的轻子味破坏测量

Long-Lived Slepton in the Coannihilation Region and Measurement of Lepton Flavour Violation at LHC

S. Kaneko, J. Sato, T. Shimomura, O. Vives, M. Yamanaka

摘要:

当最轻的slepton和最轻的neutralino之间的质量差小于τ质量时,在约束最小超对称标准模型(MSSM)中,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。在一般的MSSM中,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 and the lightest neutralino is smaller than the tau mass, the lifetime of the lightest slepton in the constrained Minimal Supersymmetric Standard Model (MSSM) increases in many orders of magnitude with respect to typical lifetimes of other supersymmetric particles. In a general MSSM, 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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