Status and prospects of light bino–higgsino dark matter in natural SUSY

Murat Abdughani; Lei Wu; Jin Min Yang

doi:10.1140/epjc/s10052-017-5485-2

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2018) 78: 4
https://doi.org/10.1140/epjc/s10052-017-5485-2

Regular Article - Theoretical Physics

Status and prospects of light bino–higgsino dark matter in natural SUSY

Murat Abdughani²^,3, Lei Wu¹^* and Jin Min Yang²^,3

¹ Department of Physics and Institude of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu, 210023, China
² CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China
³ School of Physical Sciences, University of Chinese Academy of Sciences, Beingjing, 100049, China

^* e-mail: leiwu@itp.ac.cn

Received: 26 October 2017
Accepted: 19 December 2017
Published online: 30 December 2017

Abstract

Given the recent progress in dark matter direction detection experiments, we examine a light bino–higgsino dark matter (DM) scenario ( $$M_1<100$$ GeV and $\mu <300$ GeV) in natural supersymmetry with the electroweak fine tuning measure $\Delta _\mathrm{EW}<30$ . By imposing various constraints, we note that: (i) For $\mathrm{sign}(\mu /M_1)=+1$ , the parameter space allowed by the DM relic density and collider bounds can almost be excluded by the very recent spin-independent (SI) scattering cross-section limits from the XENON1T (2017) experiment. (ii) For $\mathrm{sign}(\mu /M_1)=-1$ , the SI limits can be evaded due to the cancelation effects in the $h\tilde{\chi }^0_1\tilde{\chi }^0_1$ coupling, while rather stringent constraints come from the PandaX-II (2016) spin-dependent (SD) scattering cross-section limits, which can exclude the higgsino mass $|\mu |$ and the LSP mass $m_{\tilde{\chi }^0_1}$ up to about 230 and 37 GeV, respectively. Furthermore, the surviving parameter space will be fully covered by the projected XENON1T experiment or the future trilepton searches at the HL-LHC.