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arXiv 1505.06243hep-phhep-ex
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在LHC运行I和暗物质搜索中探测MSSM的U(1)扩展

Probing U(1) extensions of the MSSM at the LHC Run I and in dark matter searches

G. Belanger, J. Da Silva, U. Laa, A. Pukhov

摘要:

U(1)扩展超对称标准模型(UMSSM)可以容纳125 GeV的希格斯玻色子,而不依赖于顶/终止扇区的大修正。在对希格斯扇区、B物理和新粒子搜索以及暗物质约束施加LHC结果后,我们表明该模型提供了两个可行的暗物质候选者,右手(RH)sneutrino或neutralino。LHC简化模型搜索对超对称伙伴的限制是使用SModelS施加的,并允许轻方子和胶子。此外,遗迹丰度的上限往往有利于长寿命粒子的情况。在LHC上寻找Z'仍然是这个模型最明确的探测器。有趣的是,D项对sfermion质量的贡献可以用轻晕子或左手(LH)sneutrinos解释μ子在参数空间特定角落的反常磁矩。最后,我们强调直接搜索暗物质和LHC简化模型搜索之间的相互作用。

英文摘要:

The U(1) extended supersymmetric standard model (UMSSM) can accommodate a Higgs boson at 125 GeV without relying on large corrections from the top/stop sector. After imposing LHC results on the Higgs sector, on B-physics and on new particle searches as well as dark matter constraints, we show that this model offers two viable dark matter candidates, the right-handed (RH) sneutrino or the neutralino. Limits on supersymmetric partners from LHC simplified model searches are imposed using SModelS and allow for light squarks and gluinos. Moreover the upper limit on the relic abundance often favours scenarios with long-lived particles. Searches for a Z' at the LHC remain the most unambiguous probes of this model. Interestingly, the D-term contributions to the sfermion masses allow to explain the anomalous magnetic moment of the muon in specific corners of the parameter space with light smuons or left-handed (LH) sneutrinos. We finally emphasize the interplay between direct searches for dark matter and LHC simplified model searches.

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