{mu}-{tau} symmetry and radiatively generated leptogenesis

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.013012· OSTI ID:20933214

Ahn, Y H; Kim, C S; Lee, Jake ^[1]; Kang, Sin Kyu ^[2]

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1. Department of Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
2. Center for Quantum Spacetime, Sogang University, Seoul 121-742 (Korea, Republic of)

We consider a {mu}-{tau} symmetry in neutrino sectors realized at the GUT scale in the context of a seesaw model. In our scenario, the exact {mu}-{tau} symmetry realized in the basis where the charged lepton and heavy Majorana neutrino mass matrices are diagonal leads to vanishing lepton asymmetries. We find that, in the minimal supersymmetric extension of the seesaw model with large tan{beta}, the renormalization group (RG) evolution from the GUT scale to seesaw scale can induce a successful leptogenesis even without introducing any symmetry breaking terms by hand, whereas such RG effects lead to tiny deviations of {theta}{sub 23} and {theta}{sub 13} from {pi}/4 and zero, respectively. It is shown that the right amount of the baryon asymmetry {eta}{sub B} can be achieved via so-called resonant leptogenesis, which can be realized at rather low seesaw scale with large tan{beta} in our scenario so that the well-known gravitino problem is safely avoided.

• OSTI ID: 20933214
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYONS
MUON NEUTRINOS
SUPERSYMMETRY
SYMMETRY BREAKING
TAU NEUTRINOS