R Parity Violation Assisted Thermal Leptogenesis in the Seesaw Mechanism
- Institute for Studies in Theoretical Physics and Mathematics (IPM), Post Office Box 19395-5531, Tehran (Iran, Islamic Republic of)
Successful leptogenesis within the simplest type I supersymmetric seesaw mechanism requires the lightest of the three right-handed neutrino supermultiplets to be heavier than {approx}10{sup 9} GeV. Thermal production of such (s)neutrinos requires very high reheating temperatures which result in an overproduction of gravitinos with catastrophic consequences for the evolution of the Universe. In this Letter, we let R parity be violated through a {lambda}{sub i}N-circumflex{sub i}H-circumflex{sub u}H-circumflex{sub d} term in the superpotential, where N-circumflex{sub i} are right-handed neutrino supermultiplets. We show that in the presence of this term, the produced lepton-antilepton asymmetry can be enhanced. As a result, even for N-circumflex{sub 1} masses as low as 10{sup 6} GeV or less, we can obtain the observed baryon asymmetry of the Universe without gravitino overproduction.
- OSTI ID:
- 20774995
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.96.011601; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Susy seesaw inflation and NMSO(10)GUT
Supersymmetric SO(10)-inspired leptogenesis and a new N{sub 2}-dominated scenario