Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-19
Phys.Rev. D64 (2001) 123526
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, revtex, no figure
Scientific paper
10.1103/PhysRevD.64.123526
We briefly review the present status of Affleck-Dine baryo/leptogenesis scenarios in the minimal supersymmetric standard model (MSSM) in the context of the gravity-mediated SUSY breaking, and show that there is a serious cosmological problem in the Affleck-Dine mechanism. That is, the late decay of the associated large Q-balls leads to the over production of the lightest supersymmetric particles. Then, we point out that the minimal extension of the MSSM by introducing a gauged $U(1)_{B-L}$ symmetry naturally solves this problem. Here, the breaking scale of the $U(1)_{B-L}$ can be determined quite independently of the reheating temperature from the required baryon asymmetry. It is extremely interesting that the obtained scale of the $U(1)_{B-L}$ breaking is well consistent with the one suggested from the seesaw mechanism to explain the recent neutrino-oscillation experiments. We consider that the present scenario provides a new determination of the $U(1)_{B-L}$ breaking scale fully independent of the neutrino masses. We also comment on viability of the present scenario in anomaly-mediated SUSY breaking models.
Fujii Masaaki
Hamaguchi Kenji
Yanagida Takayuki
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