Chiral gauge leptoquark mass limits and branching ratios of K-L(0), B-0, B-s -> l(i)(+)l(j)(-) decays with account of the general fermion mixing in leptoquark currents

摘要

The contributions of the chiral gauge leptoquarks V-L,V-R induced by the chiral four-color quark-lepton symmetry to the branching ratios of K-L(0), B-0, B-s -> l(1)l(2) decays are calculated and analyzed using the general parametrizations of the fermion mixing matrices in the leptoquark currents. From the current experimental data on these decays under assumption m(VL) m(VR), the lower mass limit m(VL)COS gamma(L) > 5.68TeV is found, which in particular case of equal gauge coupling constants gives m(VL) > 8.03TeV. The branching ratios of the decays under consideration predicted by the chiral gauge leptoquarks are calculated and analyzed in dependence on the leptoquark masses and the mixing parameters. It has shown that in consistency with the current experimental data, these branching ratios for B-s, B-0 -> mu e decays can be close to their experimental limits and those for B-s, B-0 -> tau e, tau mu decays can be of order of 10(-7). The calculated branching ratios will be useful in the further experimental searches for these decays.