Late Leptogenesis from Radiative Soft Terms

Details Late Leptogenesis from Radiative Soft Terms Late Leptogenesis from Radiative Soft Terms

2004-04-03

arxiv.org/abs/hep-ph/0404029v1

Phys.Rev. D69 (2004) 117303

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 1 figure included

Scientific paper

10.1103/PhysRevD.69.117303

We point out that the so-called ``soft leptogenesis'' can occur at TeV scale if the $B$ term is generated through radiative corrections which involve two-loop diagrams with the gaugino exchange. This mechasnism requires the non-trivial CP phase, ${Im}(A m_{1/2}^*)\neq 0$, and can naturally explain the observed baryon asymmetry of the universe associated with the TeV scale seesaw mechanism. Such a low scale leptogenesis would be a promising option in view of the tight upper limit on the reheat temperature avoiding the gravitino problem in supergravity models.

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