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Single leptoquark production at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi></mml:math>colliders
We consider single production of leptoquarks (LQ's) at ${e}^{+}{e}^{\ensuremath{-}}$ and $\ensuremath{\gamma}\ensuremath{\gamma}$ colliders, for two values of the center-of-mass energy: $\sqrt{s}=500$ GeV and 1 TeV. We find that LQ's which couple within the first generation are observable for LQ masses almost up to the kinematic limit, both at ${e}^{+}{e}^{\ensuremath{-}}$ and $\ensuremath{\gamma}\ensuremath{\gamma}$ …