TY - JOUR
T1 - Natural soft leptogenesis
AU - Grossman, Yuval
AU - Kitano, Ryuichiro
AU - Murayama, Hitoshi
PY - 2005/6/1
Y1 - 2005/6/1
N2 - Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realized naturally within the framework of gauge mediated supersymmetry breaking. The A-term is dominated by contribution from gauge mediation, while supergravity effects are more important for the B-term. The different origins naturally explain simultaneously the smallness of the B-term and the large CP violating phase. The most stringent bounds on the model come from the cosmological gravitino problem. We find a viable parameter region with very light gravitino m3/2 ≲ 16 eV, providing a consistent framework for supersymmetry phenomenology, soft leptogenesis and cosmology.
AB - Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realized naturally within the framework of gauge mediated supersymmetry breaking. The A-term is dominated by contribution from gauge mediation, while supergravity effects are more important for the B-term. The different origins naturally explain simultaneously the smallness of the B-term and the large CP violating phase. The most stringent bounds on the model come from the cosmological gravitino problem. We find a viable parameter region with very light gravitino m3/2 ≲ 16 eV, providing a consistent framework for supersymmetry phenomenology, soft leptogenesis and cosmology.
KW - Baryogenesis
KW - Cosmology of Theories beyond the SM
KW - Supersymmetry Breaking
UR - http://www.scopus.com/inward/record.url?scp=22144447150&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2005/06/058
DO - 10.1088/1126-6708/2005/06/058
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AN - SCOPUS:22144447150
SN - 1029-8479
SP - 1357
EP - 1367
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 6
ER -