B-0 ->phi K-S in supergravity models with CP violations
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abstract
We examine the [Formula Presented] decays within the framework of SUGRA models making use of the improved QCD factorization method of Beneke et al. which allows calculations of nonfactorizable contributions. All other experimental constraints [Formula Presented] neutron and electron electric dipole moments, dark matter constraints, etc.) are imposed. We calculate the [Formula Presented] violating parameters [Formula Presented] [Formula Presented] and [Formula Presented] as well as the branching ratios (BRs) of [Formula Presented] and [Formula Presented] [Formula Presented] We find that, for the standard model (SM) and MSUGRA, it is not possible to account for the observed [Formula Presented] deviation between [Formula Presented] and [Formula Presented] In general the BRs are also in [Formula Presented] disagreement with experiment, except in the parameter region where the weak annihilation terms dominate the decay (and hence where the theory is least reliable). Thus if future data confirm the current numbers, this would represent the first significant breakdown of both SM and MSUGRA. We show then that, adding a SUGRA nonuniversal cubic soft breaking left-right term mixing the second and third generations in either the down or up quark sector, all data can be accommodated for a wide range of parameters. The full [Formula Presented] quark mass matrices are used and the supersymmetric contributions calculated without approximation. 2003 The American Physical Society.
