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

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

1999-08-30

arxiv.org/abs/hep-ph/9908499v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX-2e, 42 pages, 23 figures

Scientific paper

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^0--$\bar{B}^0$ mixing, the CP violating K^0--$\bar{K}^0$ mixing parameter $\epsilon_K$ from the standard model predictions are reduced significantly in a small $\tan\beta$ 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^0--$\bar{B}^0$ mixing amplitude can be enhanced up to 12% for $\tanb=3$ 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 $b \to s \gamma$ amplitude. The SUSY contribution to $a_\mu = \frac{(g-2)_\mu}{2}$ can be (-30 -- $+80)\times 10^{-10}$ for $\tan\beta=10$ and even larger for larger $\tan\beta$. 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 $\tan\beta$ region.

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