Flavor mixing in the gluino coupling and nucleon decay

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Abstract
Flavor mixing in the quark-squark-gluino coupling is studied for the minimal SU(5) SUGRA-GUT model and applied to the evaluation of the nucleon lifetime. All off-diagonal (generation-mixing) elements of Yukawa coupling matrices and of squark and/or slepton mass matrices are included in solving numerically one-loop renormalization group equations for MSSM parameters, and the parameter region consistent with the radiative electroweak symmetry-breaking condition is searched. It is shown that flavor mixing in the gluino coupling for a large tanβ is of the same order of magnitude as the corresponding Kobayashi-Maskawa matrix element in both up-type and down-type sectors. There exist parameter regions where the nucleon decay amplitudes for charged lepton modes are dominated by the gluino dressing process, while for all the examined regions the neutrino mode amplitudes are dominated by the W-ino dressing over the gluino dressing.
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