Freeze-in bino dark matter in high scale supersymmetry

We explore a scenario of high scale supersymmetry where all supersymmetric particles except gauginos stay at a high energy scale $M_{\mathrm{S}\mathrm{U}\mathrm{S}\mathrm{Y}}$ which is much larger than the reheating temperature $T_{\text{RH}}$. The dark matter is dominated by bino component with mass around the electroweak scale and the observed relic abundance is mainly generated by the freeze-in process during the early universe. Considering the various constraints, we identify two available scenarios in which the supersymmetric sector at an energy scale below $T_{\text{RH}}$ consists of: a) bino; b) bino and wino. Typically, for a bino mass around 0.1-1 TeV and a wino mass around 2 TeV, we find that $M_{\mathrm{S}\mathrm{U}\mathrm{S}\mathrm{Y}}$ should be around ${10}^{12-14}$ GeV with $T_{\text{RH}}$ around ${10}^{4-6}$ GeV.