Abstract
We estimate various contributions to the ..delta../ital B/=2 effective Hamiltonian in low-energy supergravity models. Estimations are made not only on the gluino contribution but also on the contributions by other supersymmetric particles and by the physical charged scalar, taking into account the external line momenta of /ital b/ quarks. We have found that the charged-scalar contribution dominates other nonstandard contributions under the conditions of the radiative breakdown of SU(2)/sub /ital L///times/U(1)/sub /ital Y// gauge symmetry, and that the effects of external momenta are very small.
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