On a method of identification of leptoquarks produced in ep collisions

We analyse numerically manifestations of the radiative amplitude zero (RAZ) effect in single leptoquark production associated with hard photon emission. We present some quantitative conclusions on the possibility to distinguish leptoquark charges produced in ep collisions taking account of three-body final state subprocesses and of proton structure functions. Applying this method to HERA and possible LEP+LHC experiments we show that the RAZ analysis can serve as a tool to determine the leptoquark electric charge up to large leptoquark masses.