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New approach for detecting a compressed bino/wino at the LHC

Submit Time: 2016-12-28
Author: Han,C 1 ; Wu,L 2 ; Yang,JM 1 ; Zhang,M 1 ; Zhang,Y 3 ;
Institute: 1.APCTP, Pohang; 2.Sydney U.; 3.Beijing, KITPC;


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 → jχ ?02χ ?±1 followed by χ ?02 → γχ ?01 and χ ?±1 → W?χ ?01 → l±νχ ?01 (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 ?M ? 5 ? 15 GeV between bino (LSP) and wino (NLSP), the 14 TeV LHC with luminosity of 500fb?1 can probe the wino up to 150 GeV (the sensitivity can reach 5σ for ?M = 5 GeV and 2σ for ?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.
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Recommended references: Han,C,Wu,L,Yang,JM,Zhang,M,Zhang,Y.(2016).New approach for detecting a compressed bino/wino at the LHC.[ChinaXiv:201612.00412] (Click&Copy)
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[V1] 2016-12-28 10:57:04 chinaXiv:201612.00412V1 Download
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