Relic abundance and detection prospects of neutralino dark matter in mirage mediation

We analyze thermal relic abundance of neutralino dark matter and discuss future prospects of its direct and indirect detections in mirage mediation.Comment: 8 pages, 12 figures. Talk given at the Dark Side of the Universe, Madrid, June 20-24, 200

μ→eγ\mu \to e \gamma and μ→3e\mu \to 3e Processes with Polarized Muon and Supersymmetric Grand Unified Theories

Lepton flavor violating processes $\mu \to e \gamma$ and $\mu \to 3e$ with polarized muons are studied in the supersymmetric grand unified theory (SUSY GUT). As a result of a detailed numerical calculation, it is shown that the P- and T-odd asymmetries defined with the help of the muon polarization and the ratio of two branching fractions make a good contrast between the SU(5) and SO(10) SUSY GUT. These observables are useful to extract differences of the two theories. In particular, the P-odd asymmetry of $\mu \to e \gamma$ varies 100%--100% in SO(10) whereas it is 100% in SU(5) and the T-odd asymmetry of $\mu \to 3e$ can reach 15% in SU(5) within the EDM constraints whereas it is small in SO(10).Comment: 9pages. Talk given at the Workshop on High Intensity Muon Sources (HIMUS99), Tsukuba, Japan, 1-4 Dec 199

Mirage unification at TeV scale and natural electroweak symmetry breaking in minimal supersymmetry

We propose a new minimal supersymmetric scenario with virtually no fine-tuning in the electroweak symmetry breaking. It favors light supersymmetric spectrum below a few TeV and predicts definite relations among stop and gaugino masses and LSP higgsino with $\mu \lesssim 200$ GeV, which are within the reach of coming LHC experiment.Comment: 4 pages, 2 figures, to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 200

Flavor and CP conserving moduli mediated SUSY breaking in flux compactification

In certain class of flux compactification, moduli mediated supersymmetry (SUSY) breaking preserves flavor and CP at leading order in the perturbative expansion controlled by the vacuum expectation value of the messenger modulus. Nevertheless there still might be dangerous flavor or CP violation induced by higher order K\"ahler potential. We examine the constraints on such SUSY breaking scheme imposed by low energy flavor and/or CP violating observables. It is found that all phenomenological constraints can be satisfied even for generic form of higher order K\"ahler potential and sparticle spectra in the sub-TeV range, under plausible assumptions on the size of higher order correction and flavor mixing angles. This implies for instance that mirage mediation scheme of SUSY breaking, which involves such modulus mediation together with an anomaly mediation of comparable size, and also the modulus-dominated mediation realized in flux compactification can be free from the SUSY flavor and CP problems, while giving gaugino and sfermion masses in the sub-TeV range.Comment: 27 pages; corrected typos, added reference