Revisiting Associated Production of 125 GeV Higgs Boson with a Photon at a Higgs Factory

Abstract

Considering the constraints from the flavor physics, precision electroweak measurements, Higgs data and dark matter detections, we scan over the parameter space of the MSSM and calculate the cross section of $e^+e^- \to h \gamma$ in the allowed parameter space. Since the loop-induced gauge couplings $h\gamma\gamma$ and $hZ\gamma$ can simultaneously contribute to the process $e^+e^- \to h \gamma$, we find the cross section can be sizably enhanced by a light stau, maximally 1.47(1.38) times larger than the SM prediction at $\sqrt{s}=240(350)$ GeV. So with the high luminosity, the measurement of $e^+e^- \to h \gamma$ may be used to test the anomalous gauge couplings $h\gamma\gamma$ and $hZ\gamma$ in the MSSM at a Higgs Factory.