### Abstract

We consider a μ-τ symmetry in neutrino sectors realized at the GUT scale in the context of a seesaw model. In our scenario, the exact μ-τ 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 β, 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 θ23 and θ13 from π/4 and zero, respectively. It is shown that the right amount of the baryon asymmetry ηB can be achieved via so-called resonant leptogenesis, which can be realized at rather low seesaw scale with large tan β in our scenario so that the well-known gravitino problem is safely avoided.

Original language | English |
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Article number | 013012 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 75 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2007 Jan 30 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*75*(1), [013012]. https://doi.org/10.1103/PhysRevD.75.013012

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*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 75, no. 1, 013012. https://doi.org/10.1103/PhysRevD.75.013012

**μ-τ symmetry and radiatively generated leptogenesis.** / Ahn, Y. H.; Kang, Sin Kyu; Kim, Choong Sun; Lee, Jake.

Research output: Contribution to journal › Article

TY - JOUR

T1 - μ-τ symmetry and radiatively generated leptogenesis

AU - Ahn, Y. H.

AU - Kang, Sin Kyu

AU - Kim, Choong Sun

AU - Lee, Jake

PY - 2007/1/30

Y1 - 2007/1/30

N2 - We consider a μ-τ symmetry in neutrino sectors realized at the GUT scale in the context of a seesaw model. In our scenario, the exact μ-τ 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 β, 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 θ23 and θ13 from π/4 and zero, respectively. It is shown that the right amount of the baryon asymmetry ηB can be achieved via so-called resonant leptogenesis, which can be realized at rather low seesaw scale with large tan β in our scenario so that the well-known gravitino problem is safely avoided.

AB - We consider a μ-τ symmetry in neutrino sectors realized at the GUT scale in the context of a seesaw model. In our scenario, the exact μ-τ 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 β, 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 θ23 and θ13 from π/4 and zero, respectively. It is shown that the right amount of the baryon asymmetry ηB can be achieved via so-called resonant leptogenesis, which can be realized at rather low seesaw scale with large tan β in our scenario so that the well-known gravitino problem is safely avoided.

UR - http://www.scopus.com/inward/record.url?scp=33846564863&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevD.75.013012

DO - 10.1103/PhysRevD.75.013012

M3 - Article

VL - 75

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 1

M1 - 013012

ER -