Investigating the production of leptoquarks by means of zeros of amplitude at photon electron collider Priyotosh Bandyopadhyay, Saunak Dutta and Anirban Karan Eur. Phys. J. C, 80 6 (2020) 573 Published online: 26 June 2020 DOI: 10.1140/epjc/s10052-020-8083-7