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arXiv 0801.3666hep-phhep-ex
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LHC上的介子-电子质量分裂测量和超对称性破缺模式

Measuring Smuon-Selectron Mass Splitting at the LHC and Patterns of Supersymmetry Breaking

B. C. Allanach, J. P. Conlon, C. G. Lester

摘要:

在大型强子对撞机(LHC)实验中,利用超对称级联衰变产生的双电子和双μ子边的差异,可以有效地抑制超对称级联衰变产生的电子-μ子质量分裂。我们研究了大型强子对撞机对这种质量分裂的敏感性,在mSUGRA中,对于30 fb^{-1}的积分亮度,这种质量分裂可能被限制在O(10^{-4})。在超对称性破缺参数空间的大部分区域,分数边分裂比分数质量分裂显著增强。在模型中,selectron和smoon被限制为在高尺度下是通用的,边缘分裂高达百分之几可能是由重整化组效应引起的,并且可能与零显著区别。边缘分裂提供了关于高尺度超对称性破缺项的重要信息,应该包括在LHC数据与高尺度模型的任何拟合中。

英文摘要:

With sufficient data, Large Hadron Collider (LHC) experiments can constrain the selectron-smuon mass splitting through differences in the di-electron and di-muon edges from supersymmetry (SUSY) cascade decays. We study the sensitivity of the LHC to this mass splitting, which within mSUGRA may be constrained down to O(10^{-4}) for 30 fb^{-1} of integrated luminosity. Over substantial regions of SUSY breaking parameter space the fractional edge splitting can be significantly enhanced over the fractional mass splitting. Within models where the selectron and smuon are constrained to be universal at a high scale, edge splittings up to a few percent may be induced by renormalisation group effects and may be significantly discriminated from zero. The edge splitting provides important information about high-scale SUSY breaking terms and should be included in any fit of LHC data to high-scale models.

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