SINGLE LEPTOQUARK PRODUCTION ASSOCIATED WITH HARD PHOTON-EMISSION IN EP COLLISIONS AT HIGH-ENERGIES

In this paper we consider single leptoquark resonance production assoc iated with the emission of a hard photon. We have obtained analytical formulae for differential and total cross sections for the cases of sc alar and vector leptoquarks. We have found that in reactions with scal ar leptoquarks there is no photon radiation in some directions dependi ng on the leptoquark electric charge (the radiative amplitude zero - t he RAZ effect). For vector leptoquarks the exact RAZ is present only i n the case of Yang-Mills coupling. We propose to use the RAZ effect to determine the types of leptoquarks. We conclude also that this effect opens a possibility to measure the leptoquark anomalous magnetic mome nt.