On probing the anomalous coupling of vector leptoquarks with photons in ep collisions by means of the radiative-amplitude-zero effect

We study a possibility ti measure the dimensionless anomalous coupling of vector leptoquarks with electromagnetic field in processes with single leptoquark production associated with hard photon emission in ep collisions. We show that the angular distribution is more sensitive to this anomalous coupling for reactions where the radiative-amplitude-zero effect takes place in the case of pure Yang-Mills coupling. Looking for optimal kinematical cuts we find that the sensitivity can be rised by applying cuts on Bjorken variable χ excluding the points near the resonant peak. Although this reduces statistics significantly, we show that the radiative-amplitude-zero effect still might serve as a tool for probing the anomalous photon-vector leptoquarks coupling at ep future colliders