• Open Access

Toward deconstructing the simplest seesaw mechanism

Sanjoy Mandal, O. G. Miranda, G. Sanchez Garcia, J. W. F. Valle, and Xun-Jie Xu
Phys. Rev. D 105, 095020 – Published 17 May 2022

Abstract

The triplet or type-II seesaw mechanism is the simplest way to endow neutrinos with mass in the Standard Model (SM). Here we review its associated theory and phenomenology, including restrictions from S, T, U parameters, neutrino experiments, charged lepton flavor violation as well as collider searches. We also examine restrictions coming from requiring consistency of electroweak symmetry breaking, i.e., perturbative unitarity and stability of the vacuum. Finally, we discuss novel effects associated to the scalar mediator of neutrino mass generation namely, (i) rare processes, e.g., lαlβγ decays, at the intensity frontier, and also (ii) four-lepton signatures in colliders at the high-energy frontier. These can be used to probe neutrino properties in an important way, providing a test of the absolute neutrino mass and mass-ordering, as well as of the atmospheric octant. They may also provide the first evidence for charged lepton flavor violation in nature. In contrast, neutrino nonstandard interaction strengths are found to lie below current detectability.

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  • Received 23 March 2022
  • Accepted 21 April 2022

DOI:https://doi.org/10.1103/PhysRevD.105.095020

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Sanjoy Mandal1,*, O. G. Miranda2,†, G. Sanchez Garcia2,‡, J. W. F. Valle3,§, and Xun-Jie Xu4,∥

  • 1Korea Institute for Advanced Study, Seoul 02455, Korea
  • 2Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN Apartado Postal 14-740 07000 Ciudad de México, Mexico
  • 3AHEP Group, Institut de Física Corpuscular - C.S.I.C./Universitat de València, Parc Cientific de Paterna. C/Catedratico José Beltrán, 2 E-46980 Paterna (València), Spain
  • 4Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • *smandal@kias.re.kr
  • omr@fis.cinvestav.mx
  • gsanchez@fis.cinvestav.mx
  • §valle@ific.uv.es
  • xuxj@ihep.ac.cn

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Vol. 105, Iss. 9 — 1 May 2022

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