R-parity violation assisted thermal leptogenesis in the seesaw mechanism
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R-parity violation assisted thermal leptogenesis in the seesaw mechanism

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R-parity violation assisted thermal leptogenesis in the seesaw mechanism

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Farzan, Yasaman; Furtado Valle, José Wagner Perfil
Aquest document és un/a article, creat/da en: 2006
Successful leptogenesis within the simplest type I supersymmetric seesaw mechanism requires the lightest of the three right-handed neutrino supermultiplets to be heavier than ∼109 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 λiN^iH^uH^d term in the superpotential, where N^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^1 masses as low as 106 GeV or less, we can obtain the observed baryon asymmetry of the universe without gravitino overproduction.

    Farzan, Yasaman Furtado Valle, José Wagner 2006 R-parity violation assisted thermal leptogenesis in the seesaw mechanism Physical Review Letters 96 1 011601
http://dx.doi.org/10.1103/PhysRevLett.96.011601
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