MASS LIMITS FOR SCALAR AND GAUGE LEPTOQUARKS FROM K⁰L→ e∓μ±, B⁰→e∓τ± DECAYS

The contributions of scalar and gauge leptoquarks into widths of [Formula: see text], B 0 →e ∓ τ ± decays are calculated in the models with the vectorlike and chiral four-color symmetry and with the Higgs mechanism of the quark–lepton mass splitting. From the current data on [Formula: see text] and B 0 decays the mass limits for scalar and chiral leptoquarks and the updated vector leptoquark mass limits are obtained. It is shown that unlike the gauge leptoquarks the scalar leptoquark mass limits are weak, of order or below their direct mass limits. The search for such scalar leptoquarks at LHC and the further search for leptonic decays [Formula: see text] are of interest.