The sensitivity of cosmic ray air shower experiments for leptoquark   detection
  Leptoquarks arise naturally in models attempting the unification of the quark and lepton sectors of the standard model of particle physics. Such particles could be produced in the interaction of high energy quasi-horizontal cosmic neutrinos with the atmosphere, via their direct coupling to a quark and a neutrino. The hadronic decay products of the leptoquark, and possibly its leptonic decay products would originate an extensive air shower, observable in large cosmic ray experiments. In this letter, the sensitivity of present and planned very high energy cosmic ray experiments to the production of leptoquarks of different types is estimated and discussed. 
M.C. Espirito Santo, A. Onofre, M. Paulos, M. Pimenta, J. C. Romao, B.   Tome