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arXiv 2202.12928hep-phhep-ex
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有和无稳定中性伴子μ介子g-2反常的超对称解释

Supersymmetric explanation of the muon g-2 anomaly with and without stable neutralino

Manimala Chakraborti, Sho Iwamoto, Jong Soo Kim, Rafał Masełek, Kazuki Sakurai

摘要:

在本文中,我们探讨的可能性,解释μ子$g-2$异常的各种类型的超对称扩展的标准模型。特别是,我们调查和比较的现象学约束MSSM与稳定的中性伴子和其他类型的情况下,中性伴子是不稳定的。对于后一种情况,我们研究了规范介导的超对称性破缺(GMSB)的情况下,非常轻的引力子和$UDD$型的R-宇称违反(RPV)的情况。在具有稳定中性伴子的MSSM中,$(g-2)_μ$所偏爱的参数区域受到中性伴子残余丰度和暗物质直接探测实验以及LHC在轻子加缺失横能道中搜索的强烈约束。另一方面,没有稳定中性伴子的情况不受暗物质约束,而大型强子对撞机的约束强烈依赖于中性伴子的衰变。我们发现,在GMSB中,如果下一个超对称粒子(NLSP)是中性伴子,那么μ子$g-2$所偏爱的整个参数区域已经被排除,而如果NLSP是stau,那么某些区域仍然是允许的。在RPV方案中,LHC的约束比其他方案要弱得多,并且μ子$g-2$的参数空间仍然有很大的空间。

英文摘要:

In this paper we explore the possibility of explaining the muon $g-2$ anomaly in various types of supersymmetric extensions of the Standard Model. In particular, we investigate and compare the phenomenological constraints in the MSSM with stable neutralino and the other types of scenarios where the neutralino is unstable. For the latter case we study the Gauge Mediated SUSY Breaking (GMSB) scenario with very light gravitino and the $UDD$-type R-Parity Violating (RPV) scenario. In the MSSM with stable neutralino, the parameter region favoured by the $(g-2)_μ$ is strongly constrained by the neutralino relic abundance and the dark matter direct detection experiments, as well as by the LHC searches in the lepton plus missing transverse energy channel. On the other hand, the scenarios without stable neutralino are free from the dark matter constraints, while the LHC constraints depend strongly on the decay of the neutralino. We find that in GMSB the entire parameter region favoured by the muon $g-2$ is already excluded if the Next Lightest SUSY Particle (NLSP) is the neutralino, while some regions are still allowed if the NLSP is stau. In the RPV scenario, the LHC constraints are much weaker than the other scenarios and a wide region of the parameter space is still open for the muon $g-2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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