SUSY effects in Higgs production at high energy e+ e- colliders

Abstract

Considering the constraints from collider experiments and dark matter detection, we investigate the SUSY effects in the Higgs production channels e+ e- → Zh at an e+ e- collider with a center-of-mass energy above 240 GeV and γγ → h → bb at a photon collider with a center-of-mass energy above 125 GeV. In the parameter space allowed by current experiments, we find that the SUSY corrections to e+ e- → Zh can reach a few percent and the production rate of γγ → h → bb can be enhanced by a factor of 1.2 over the SM prediction. We also calculate the exotic Higgs production e+ e-→ Zh1 in the next-to-minimal supersymmetric model (NMSSM) (h is the SM-like Higgs, h1 is the CP-even Higgs bosons which can be much lighter than h). We find that at a 250 GeV e+ e- collider the production rates of e+ e-→ Zh1 can reach 60 fb.