The Compton Form Factors of the 4 Helium Nucleus

The number of Compton form factors of a scalar hadron is known to be three. It may be expected that depending on the structure of that hadron, it may occur that in some kinematical regimes the observables are only sensitive to one dominant form factor. Here we show in a particular kinematic situation that one may perform an experiment that unequivocally answers the question whether other form factors besides the anticipated dominant one can be neglected or not.