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arXiv 1409.4533hep-phhep-ex
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在LHC上检测压缩bino/wino的新方法

A new approach for detecting compressed bino/wino at the LHC

Chengcheng Han, Lei Wu, Jin Min Yang, Mengchao Zhang, Yang Zhang

摘要:

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,我们建议探测这种情况下,从$pp \to j \tildeχ^0_2 \tildeχ^\pm_1$其次是$\tildeχ^0_2 \to γ\tildeχ^0_1$和$\tildeχ^\pm_1 \to W^{*}\tildeχ^0_1\to \ell^\pm ν\tildeχ^0_1$(这种方法也适用于压缩二进制/higgsino的情况)。通过对信号和背景的详细蒙特卡罗模拟,我们发现,对于$ΔM \sim 5-15$ GeV的质量分裂,在500 $fb^{-1}$的14 TeV LHC上可以探测到150 GeV的质量分裂(对于$ΔM = 5$ GeV,灵敏度可以达到$5σ$;对于$ΔM = 15$ GeV,灵敏度可以达到$2σ$).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。

英文摘要:

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 $pp \to j \tildeχ^0_2 \tildeχ^\pm_1$ followed by $\tildeχ^0_2 \to γ\tildeχ^0_1$ and $\tildeχ^\pm_1 \to W^{*}\tildeχ^0_1\to \ell^\pm ν\tildeχ^0_1$ (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 $ΔM \sim 5-15$ 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 $5σ$ for $ΔM = 5$ GeV and $2σ$ for $ΔM = 15$ 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.

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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