Charged scalars confronting neutrino mass and muon g − 2 anomaly

Nabarun Chakrabarty (Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan, 30013, R.O.C.) ; Cheng-Wei Chiang (Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan, 30013, R.O.C.; Department of Physics, National Taiwan University, Taipei, Taiwan, 10617, R.O.C.; Institute of Physics, Academia Sinica, Taipei, Taiwan, 11529, R.O.C.) ; Takahiro Ohata (Department of Physics, Kyoto University, Kyoto, 606-8502, Japan) ; Koji Tsumura (Department of Physics, Kyoto University, Kyoto, 606-8502, Japan)

The present work introduces two possible extensions of the Standard Model Higgs sector. In the first case, the Zee-Babu type model for the generation of neutrino mass is augmented with a scalar triplet and additional singly charged scalar singlets. The second scenario, on the other hand, generalizes the Type-II seesaw model by replicating the number of the scalar triplets. A ℤ3 symmetry is imposed in case of both the scenarios, but, allowed to be violated by terms of mass dimension two and three for generating neutrino masses and mixings. We examine how the models so introduced can explain the experimental observation on the muon anomalous magnetic moment. We estimate the two-loop contribution to neutrino mass induced by the scalar triplet, in addition to what comes from the doubly charged singlet in the usual Zee-Babu framework, in the first model. On the other hand, the neutrino mass arises in the usual Type-II fashion in the second model. In addition, the role of the ℤ3 symmetry in suppressing lepton flavor violation is also elucidated.

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      "surname": "Chiang", 
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      "value": "The present work introduces two possible extensions of the Standard Model Higgs sector. In the first case, the Zee-Babu type model for the generation of neutrino mass is augmented with a scalar triplet and additional singly charged scalar singlets. The second scenario, on the other hand, generalizes the Type-II seesaw model by replicating the number of the scalar triplets. A \u21243 symmetry is imposed in case of both the scenarios, but, allowed to be violated by terms of mass dimension two and three for generating neutrino masses and mixings. We examine how the models so introduced can explain the experimental observation on the muon anomalous magnetic moment. We estimate the two-loop contribution to neutrino mass induced by the scalar triplet, in addition to what comes from the doubly charged singlet in the usual Zee-Babu framework, in the first model. On the other hand, the neutrino mass arises in the usual Type-II fashion in the second model. In addition, the role of the \u21243 symmetry in suppressing lepton flavor violation is also elucidated."
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Published on:
14 June 2019
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2018 (2019)
Issue 12
Pages 1-32
DOI:
https://doi.org/10.1007/JHEP12(2018)104
arXiv:
1807.08167
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: