Leptogenesis from a sneutrino condensate revisited

Details Leptogenesis from a sneutrino condensate revisited Leptogenesis from a sneutrino condensate revisited

2004-01-09

arxiv.org/abs/hep-ph/0401054v2

Phys.Rev. D69 (2004) 103522

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 revtex pages, 3 figures, 1 table. Slightly modified and references added. Final version accepted for publication in Phys. R

Scientific paper

10.1103/PhysRevD.69.103522

We re--examine leptogenesis from a right--handed sneutrino condensate, paying special attention to the $B-$term associated with the see--saw Majorana mass. This term generates a lepton asymmetry in the condensate whose time average vanishes. However, a net asymmetry will result if the sneutrino lifetime is not much longer than the period of oscillations. Supersymmetry breaking by thermal effects then yields a lepton asymmetry in the standard model sector after the condensate decays. We explore different possibilities by taking account of both the low--energy and Hubble $B-$terms. It will be shown that the desired baryon asymmetry of the Universe can be obtained for a wide range of Majorana mass.

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