Effects of Large Threshold Corrections in Supersymmetric Type-I Seesaw Model

摘要

We investigate lepton flavor violating (LFV) radiative processes and therelic abundance of neutralino dark matter in supersymmetric type-I seesawmodel. We carefully derive threshold corrections to the flavor off-diagonalelements of slepton mass matrix and up-type Higgs mass squared and find thatthey can be large in the case of large $B_N^0$. We examine how the branchingratios of LFV radiative decays and the relic abundance of neutralino darkmatter can be significantly affected by the large threshold corrections. Softscalar mass squared parameter of up-type Higgs scalar is also affected by thethreshold corrections. Since the higgsino mass depends on the mass parameterfor up-type Higgs, the LFV processes and the relic abundance of the neutralinodark matter are correlated with each other. We show that there are parameterregions where the predictions of the relic abundance of neutralino dark matterare consistent with WMAP observation and the branching ratios of LFV radiativedecays are predicted to be testable in future experiments. We find that themasses of scalar supersymmetric particles are not necessarily small so that thebranching ratios of LFV decays can be testable in future experiment, which isdistinctive feature of this scenario.