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arXiv 2111.06296hep-ex
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在$\sqrt{s} =$ 13 TeV质子-质子碰撞中寻找具有两个或三个软轻子和丢失横动量的末态超对称性

Search for supersymmetry in final states with two or three soft leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

在两个或三个低动量轻子和失踪的横动量事件的超对称性的搜索进行。该搜索使用LHC CMS实验在2016-2018年三年期间收集的$\sqrt{s} =$ 13 TeV的质子-质子碰撞,对应于高达137 fb $^{-1}$的积分亮度。发现数据与标准模型过程的预期一致。结果被解释在电弱子和顶夸克对生产的超对称粒子和最轻的中性伴子之间的质量差很小。对于电弱子的解释,使用了两个简化的模型,一个维诺-比诺模型和一个希格西诺模型。在95%置信水平下的排除极限被设定在$\widetildeχ^0_2 / \widetildeχ^\pm_1$质量上,对于wino-bino情况下的10 GeV的质量差,最高为275 GeV,对于higgsino情况下的7.5(3)GeV的质量差,最高为205(150)GeV。的结果higgsino进一步解释使用唯象最小超对称标准模型,不包括higgsino质量参数$μ$高达180 GeV的双质量参数$M_1$在800 GeV。在顶夸克解释,排除限制被设置在顶夸克质量高达540 GeV的四体顶夸克衰变和高达480 GeV的电荷介导的衰变与质量差为30 GeV。

英文摘要:

A search for supersymmetry in events with two or three low-momentum leptons and missing transverse momentum is performed. The search uses proton-proton collisions at $\sqrt{s} =$ 13 TeV collected in the three-year period 2016-2018 by the CMS experiment at the LHC and corresponding to an integrated luminosity of up to 137 fb$^{-1}$. The data are found to be in agreement with expectations from standard model processes. The results are interpreted in terms of electroweakino and top squark pair production with a small mass difference between the produced supersymmetric particles and the lightest neutralino. For the electroweakino interpretation, two simplified models are used, a wino-bino model and a higgsino model. Exclusion limits at 95% confidence level are set on $\widetildeχ^0_2 / \widetildeχ^\pm_1$ masses up to 275 GeV for a mass difference of 10 GeV in the wino-bino case, and up to 205 (150) GeV for a mass difference of 7.5 (3) GeV in the higgsino case. The results for the higgsino are further interpreted using a phenomenological minimal supersymmetric standard model, excluding the higgsino mass parameter $μ$ up to 180 GeV with the bino mass parameter $M_1$ at 800 GeV. In the top squark interpretation, exclusion limits are set at top squark masses up to 540 GeV for four-body top squark decays and up to 480 GeV for chargino-mediated decays with a mass difference of 30 GeV.

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