Leptoquark Pair Production in \gamma\gamma Scattering: Threshold   Resummation
  The possibilities to pair-produce leptoquarks in photon-photon collisions are discussed. QCD threshold corrections lead to a strong enhancement of the production cross section. Suitably long-lived leptoquarks ($\Gamma_\Phi \lsim 100 \MeV$) may form Leptoquarkonium states. 
Johannes Bl\"umlein and Alexandre Kryukov