Wang, F (reprint author), Zhengzhou Univ, Dept Phys & Engn, Zhengzhou 450000, Peoples R China.
[Wang, Fei] Zhengzhou Univ, Dept Phys & Engn, Zhengzhou 450000, Peoples R China
; [Wang, Wenyu] Beijing Univ Technol, Inst Theoret Phys, Coll Appl Sci, Beijing 100124, Peoples R China
; [Wang, Fei
; Wang, Wenyu
; Yang, Jin Min] Chinese Acad Sci, Inst Theoret Phys China, Beijing 100080, Peoples R China
We recalculate the two-loop beta functions for three gauge couplings taking into account all low energy threshold corrections in split supersymmetry(split-SUSY) which assumes a very high scalar mass scale M-S. We find that in split-SUSY with a gaugino mass unification assumption and with a large M-S the gauge coupling unification requires a lower bound on the gaugino mass. Combined with the constraints from the dark matter relic density and direct detection limits, we find that split-SUSY is very restricted and for dark matter mass below 1 TeV the allowed parameter space can be fully covered by XENON-1T(2017).