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

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 ( GeV and GeV) in natural supersymmetry with the electroweak fine tuning measure . By imposing various constraints, we note that: (i) For , 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 , the SI limits can be evaded due to the cancelation effects in the coupling, while rather stringent constraints come from the PandaX-II (2016) spin-dependent (SD) scattering cross-section limits, which can exclude the higgsino mass and the LSP mass 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.