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arXiv 1909.07792hep-phhep-ex
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在LHC及更远的地方测试μ子$g-2$和暗物质的电弱SUSY

Testing electroweak SUSY for muon $g-2$ and dark matter at the LHC and beyond

Murat Abdughani, Ken-ichi Hikasa, Lei Wu, Jin Min Yang, Jun Zhao

摘要:

鉴于LHC实验已经对有色超对称粒子(sparticles)产生了很强的约束,测试电弱超对称性(EWSUSY)将是LHC的下一个关键任务。另一方面,EWSUSY中的轻电弱子和轻子也对暗物质和低能轻子观测值有贡献。它们的精密测量将为超对称性提供间接证据。在这项工作中,我们面对的EWSUSY与μ子$g-2$异常,DM遗迹密度,直接检测限和最新的LHC运行2数据。我们发现,超中微子DM或具有相当大的higgsino分量的中性伴子DM已被直接探测所排除。然后确定了两个可行的方案:一个是轻压缩的bino和slepton,但重希格斯诺,另一个是轻压缩的bino,winos和slepton。在前一种情况下,LSP和slepton质量必须小于约350 GeV。而在后一种情况下,LSP和slepton质量必须分别小于约700 GeV和800 GeV。通过研究这些超粒子在未来对撞机上的可观测性,发现光度为15 ab $^{-1}$的HE-LHC可以在$2σ$水平上排除整个BHL和大部分BWL场景。在轻子对撞机上对希格斯耦合的精确测量可以对探测BWL方案起到补充作用。

英文摘要:

Given that the LHC experiment has produced strong constraints on the colored supersymmetric particles (sparticles), testing the electroweak supersymmetry (EWSUSY) will be the next crucial task at the LHC. On the other hand, the light electroweakinos and sleptons in the EWSUSY can also contribute to the dark matter (DM) and low energy lepton observables. The precision measurements of them will provide the indirect evidence of SUSY. In this work, we confront the EWSUSY with the muon $g-2$ anomaly, the DM relic density, the direct detection limits and the latest LHC Run-2 data. We find that the sneutrino DM or the neutralino DM with sizable higgsino component has been excluded by the direct detections. Then two viable scenarios are pinned down: one has the light compressed bino and sleptons but heavy higgsinos, and the other has the light compressed bino, winos and sleptons. In the former case, the LSP and slepton masses have to be smaller than about 350 GeV. While in the latter case, the LSP and slepton masses have to be smaller than about 700 GeV and 800 GeV, respectively. From investigating the observability of these sparticles in both scenarios at future colliders, it turns out that the HE-LHC with a luminosity of 15 ab$^{-1}$ can exclude the whole BHL and most part of BWL scenarios at $2σ$ level. The precision measurement of the Higgs couplings at the lepton colliders could play a complementary role of probing the BWL scenario.

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