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arXiv 1005.5136hep-ph
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LHC上的Tau-超中微子NLSP和多轻子签名

Tau-Sneutrino NLSP and Multilepton Signatures at the LHC

Terrance Figy, Krzysztof Rolbiecki, Yudi Santoso

摘要:

在以引力子作为最轻超对称粒子(LSP)的模型中,次轻超对称粒子(NLSP)可以有很长的寿命,并且在对撞机实验中表现稳定。我们研究了在非普适Higgs质量假设下实现的以τ-超中微子为NLSP的假设的轻子特征。我们专注于一个有趣的三轻子签名,两个相同的符号的τ和一个电子或μ子的相反的符号。在所考虑的模型中,中性伴子和电荷伴子是相当重的,三轻子信号主要来自slepton-sneutrino的产生。我们确定了相关的背景,考虑到τ衰变,并设计了一套削减,以优化这个三轻子信号。我们模拟信号和背景在LHC与14 TeV的质心能量。虽然这个模型中的slepton相对较轻,O(100 GeV),但与典型的中性伴子LSP场景相比,发现更为苛刻。三轻子信号需要大量的累积数据,在CM能量为14 TeV时,至少需要~80 fb^-1。

英文摘要:

In models with gravitino as the lightest supersymmetric particle(LSP), the next to lightest supersymmetric particle (NLSP) can have a long lifetime and appear stable in collider experiments. We study the leptonic signatures of such a scenario with tau-sneutrino as the NLSP, which is realized in the non-universal Higgs masses scenario. We focus on an interesting trilepton signature with two like-sign taus and an electron or a muon of opposite sign. The neutralinos and charginos are quite heavy in the model considered, and the trilepton signal comes mostly from the slepton-sneutrino production. We identify the relevant backgrounds, taking into account tau decays, and devise a set of cuts to optimize this trilepton signal. We simulate signal and backgrounds at the LHC with 14 TeV center-of-mass energy. Although the sleptons in this model are relatively light, O(100 GeV), discovery is more demanding compared to typical neutralino LSP scenarios. The trilepton signal requires large amount of accumulated data, at least ~80 fb^-1, at the CM energy of 14 TeV.

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