Thermal Leptogenesis Scenarios in the Restrictive Left-Right Symmetric Model(Particles and Fields)

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概要

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• We investigate thermal leptogenesis scenarios in the left-right symmetric extension of the standard model. Imposing the realization of D-parity below the GUT scale and grand unification make our model more restrictive and improve its predictive capability. In this case, a D-parity odd singlet plays a critical role. This singlet may cause a very large mass hierarchy of the SU(2)_<L,R> triplet scalars. We test our model by investigating baryogenesis via leptogenesis. Our model has two sources for the lepton number asymmetry in the universe, the heavy right-handed neutrinos Ni (i = 1, 2, 3) and the SU(2)_L triplet scalar Δ_L. Leptogenesis scenarios can be categorized according to these mass scales. If the light neutrinos are Majorana and have a hierarchical mass spectrum, we can obtain a successful result in leptogenesis through N_1-decay. However, we find that the normal mass hierarchy of the light neutrinos is inconsistent with leptogenesis through Δ_L-decay in the SM. In order to obtain successful thermal leptogenesis through Δ_L-decay, we need to introduce additional Higgs doublets. This result suggests the two-Higgs doublet model with an SU(2)_L triplet scalar.

• 2007-06-25

著者

• WAKABAYASHI Yuya

  Department of Physics, Rikkyo University

• Wakabayashi Yuya

  Department Of Physics Rikkyo University

関連論文

• Thermal Leptogenesis Scenarios in the Restrictive Left-Right Symmetric Model(Particles and Fields)
• Coupling Constant Dependence of the Kaluza-Klein Spectrum in Five-Dimensional SQCD on S^1 (Particles and Fields)
• Factorization Algorithm for Parton Showers beyond the Leading Logarithmic Order of QCD(Particles and Fields)

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