Mass Spectrum Dependence of Higgs-mediated mu-e Transition in the MSSM (1104.1750v2)

Abstract: In this paper, we study non-decoupling $\mu$ - $e$ transition effects by Higgs-mediated contribution in the MSSM, when some SUSY mass parameters are much greater than TeV. In order to treat CP-odd Higgs mass $m_{A^{0}}$ as a free parameter, we consider the non-universal Higgs mass model (NUHM), and assume the only left- or right-handed sleptons had flavor-mixing mass terms. If both Higgs-mediated and ordinary SUSY contribution are significant, the ratio of branching ratios $\BR(\meg) / \BR(\maleal)$ becomes sensitive to SUSY mass parameters. We investigated these mass-sensitive regions and the behavior of the ratio $\BR(\meg) / \BR(\maleal)$ in some mass spectrum of the NUHM, and found that this ratio drastically depends on the mass spectrum structure and chirality of flavor violation. Log factor from two split mass scale influences the way of interference between gaugino- and Higgs-mediated contributions significantly.