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Lower bounds on lepton flavor violating branching ratios in a radiative seesaw model

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Title: Lower bounds on lepton flavor violating branching ratios in a radiative seesaw model
Authors: Seto, Osamu Browse this author →KAKEN DB
Shindou, Tetsuo Browse this author →KAKEN DB
Tsuyuki, Takanao Browse this author
Issue Date: 16-May-2022
Publisher: American Physical Society (APS)
Journal Title: Physical Review D
Volume: 105
Issue: 9
Start Page: 095018
Publisher DOI: 10.1103/PhysRevD.105.095018
Abstract: We study the lepton flavor violating decays such as μ→eγ, τ→eγ, τ→μγ in the three-loop radiative seesaw model proposed by Krauss, Nasri, and Trodden. In this model, the relevant coupling constants are larger for the heavier scalars that run inside loop diagrams to generate the appropriate magnitude of neutrino masses. Imposing a criterion that all the coupling constants must be small enough to be treated perturbatively, we find an upper bound on the mass of one of the scalars. By combining it with neutrino mass parameters, we derive lower bounds on the branching ratios of the lepton flavor violating processes. In a case with the inverted mass ordering and best-fit neutrino oscillation parameters, one of the lower bounds is Br(μ→eγ)>1.1×10−13, which is within the reach of the MEG II experiment.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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