| Abstract
摘要 | Motivated by the Higgs quartic coupling $\lambda \simeq 0$ at an intermediate scale, we propose new models of split supersymmetry in which gauginos acquire intermediate scale Dirac masses $\sim 10^{8-10}$~GeV\@. Scalar masses arise from one-loop finite contributions as well as direct gravity-mediated contributions. Like split supersymmetry, one Higgs doublet is fine-tuned to be light. Gauge coupling unification persists (nontrivially, due to adjoint multiplets). The $\mu$-term is naturally at the weak scale, and provides (the only) opportunity for experimental verification. In the “pure” model, the lightest Higgsino decays through $R$-parity violating couplings. In the “hypercharge-impure” model, Higgsino dark matter can emerge with its mass ($m_{\tilde{\chi}_1} \simeq 1.1$~TeV) and an inelastic splitting ($m_{\tilde{\chi}_2} - m_{\tilde{\chi}_1} \simeq 0.1$-$1$~MeV) naturally generated from the same UV dynamics, and is very challenging to discover in dark matter detection and collider experiments. |
