New approach for detecting a compressed bino/wino at the LHC
New approach for detecting a compressed bino/wino at the LHC
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DOI：
10.1103/physrevd.91.055030
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发表时间：
2014-09
影响因子：
5
通讯作者：
C. Han;Lei Wu;Jin Min Yang;Mengchao Zhang;Yang Zhang
中科院分区：
文献类型：
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作者：
C. Han;Lei Wu;Jin Min Yang;Mengchao Zhang;Yang Zhang
在一些超对称模型中，如分裂超对称或具有非普适的高吉诺质量的模型，双（LSP）和维诺（NLSP）可能具有相当小的质量分裂，以便通过双/维诺共湮灭提供正确的暗物质遗迹密度。这样一个带有压缩bino/wino的场景很难在LHC上探索。在这项工作中，我们建议从$pp \到j \tilde{\chi}^0_2 \tilde{\chi}^\pm_1$，然后是$\tilde{\chi}^0_2 \到\gamma \tilde{\chi}^0_1$和$\tilde{\chi}^\pm_1 \到W^{*}\tilde{\chi}^0_1\到\ell^\pm \nu \tilde{\chi}^0_1$来探测这种情况。（该方法也适用于压缩的bino/higgsino场景）。通过对信号和背景的详细蒙特卡罗模拟，我们发现，对于bino（LSP）和wino（NLSP）之间的质量分裂$\Delta M \sim 5-15$ GeV，14 TeV LHC的亮度为500 $fb ^{-1}$，可以探测150 GeV的维诺（对于$\Delta M = 5$ GeV，灵敏度可以达到$5\sigma$，对于$\Delta M = 15$ GeV，灵敏度可以达到$2\sigma$）。我们还研究了这种情况下的暗物质探测灵敏度，发现计划中的XENON-1 T（2017）无法完全覆盖遗迹密度和LUX限制所允许的低于150 GeV的参数空间。
In some supersymmetric models like split supersymmetry or models with non-universal gaugino mass, bino (LSP) and winos (NLSP) may have rather small mass splitting in order to provide the correct dark matter relic density through bino/wino co-annihilation. Such a scenario with the compressed bino/wino is difficult to explore at the LHC. In this work we propose to probe this scenario from $pp \to j \tilde{\chi}^0_2 \tilde{\chi}^\pm_1$ followed by $\tilde{\chi}^0_2 \to \gamma \tilde{\chi}^0_1$ and $\tilde{\chi}^\pm_1 \to W^{*}\tilde{\chi}^0_1\to \ell^\pm \nu \tilde{\chi}^0_1$ (this method is also applicable to the compressed bino/higgsino scenario). Through a detailed Monte Carlo simulation for both the signal and the backgrounds, we find that for a mass splitting $\Delta M \sim 5-15$ GeV between bino (LSP) and wino (NLSP), the 14 TeV LHC with luminosity of 500$fb^{-1}$ can probe the wino up to 150 GeV (the sensitivity can reach $5\sigma$ for $\Delta M = 5$ GeV and $2\sigma$ for $\Delta M = 15$ GeV). We also investigate the dark matter detection sensitivities for this scenario and find that the planned XENON-1T(2017) cannot fully cover the parameter space with wino below 150 GeV allowed by relic density and the LUX limits.