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Timelike transition form factor for CP-odd Higgs boson production

Ken Sasaki, Tsuneo Uematsu

SciPost Phys. Proc. 7, 044 (2022) · published 22 June 2022

Proceedings event

15th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology


We investigate the production of CP-odd Higgs boson $A^0$ associated with a real $\gamma$ in $e^+e^-$ collisions. Because of the properties of $A^0$ coupling to the other fields, the main contribution comes from the top-quark triangle loop diagrams. We obtain the timelike transition form factor which describes the production amplitude of $A^0$ in the $e^+e^-$ collisions. This timelike transition form factor is related to the spacelike transition form factor relevant for the $A^0$ production in $e^-\gamma$ collisions. It turns out that the possible extra contributions from chargino-sneutrino and neutralino-selectron box diagrams do not give sizable effects.

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