Flavor changing neutral current processes and the muon anomalous magnetic moment in the supergravity model

Flavor changing neutral current processes in B and K decays in the supergravity model are revisited taking into account the recent progress of Higgs boson search experiments at LEP. Possible deviations of B–B 0 mixing, the CP violating K–K 0 mixing parameter ǫK from the standard model predictions are reduced significantly in a small tanβ region due to the constraints on the SUSY parameter space imposed by the Higgs boson search. With the present bound on the Higgs boson mass, the magnitude of the B–B 0 mixing amplitude can be enhanced up to 12% for tanβ = 3 in the minimal supergravity. If we relax the strict universality of SUSY breaking scalar masses at the GUT scale, the deviation can be 25%. We also investigate SUSY contributions to the muon anomalous magnetic moment in the supergravity model and show that there is a correlation with the b → s γ amplitude. The SUSY contribution to aμ = (g−2)μ 2 can be (−30 – +80) × 10 for tan β = 10 and even larger for larger tanβ. The improved measurement of the muon anomalous magnetic moment in the on-going experiment at BNL will put a strong constraint on SUSY parameter space, especially for a large tanβ region. ∗ E-mail: [email protected]. † E-mail: [email protected]. ‡ E-mail: [email protected].