The HZγ coupling can be obtained from the measurement of the H → Zγ branching fraction in the ZZγ final state, on the one hand; and from the combined measurement of the H → γγ branching fraction and the e+e− → Hγ cross section, on the other. The requirements on the detector design (photon identification, photon energy/angular resolutions, in particular) to achieve a meaningful measurement of the HZγ coupling (e.g., with a precision significantly better than HL- LHC projections) will be studied.
- Associated production of Higgs bosons and a photon in high-energy e+e− collisions A. Djouadi et al, Nucl.Phys. B491 (1997) 68
- Next-to-leading-order QCD corrections to e+e− → H + γ W-L Sang et al, Phys. Lett. B 775 (2017) 152