Abstract
We extend the littlest modular seesaw to a Grand Unified scenario based on SU (5) endowed with three modular S4 symmetries. We leverage symmetry protected zeroes in the leptonic and down quark sectors to suppress deviations to the littlest modular seesaw predictions, but not contributions to the quark mixing. The model is supplemented by two weighton fields, such that the hierarchical nature of the charged-lepton masses, as well as the quark masses and mixing, stem from the content and symmetries of the model, rather than a hierarchical nature of the Yukawa coefficients.
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Acknowledgments
This work was partially supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) by the projects CERN/FIS-PAR/0002/2021, CERN/FIS-PAR/0019/2021, CFTPFCT Unit UIDB/00777/2020 and UIDP/00777/2020, which are partially funded through POCTI (FEDER), COMPETE, QREN and EU. IdMV acknowledges support by FCT fellowships in the framework of the project UIDP/00777/2020. M.L. acknowledges support from FCT through the grant No. PD/BD/150488/2019, in the framework of the Doctoral Programme IDPASC-PT. SFK acknowledges the STFC Consolidated Grant ST/L000296/1 and the European Union’s Horizon 2020 Research and Innovation programme under Marie Sklodowska-Curie grant agreement HIDDeN European ITN project (H2020-MSCA-ITN-2019//860881-HIDDeN).
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de Medeiros Varzielas, I., King, S.F. & Levy, M. A modular SU (5) littlest seesaw. J. High Energ. Phys. 2024, 203 (2024). https://doi.org/10.1007/JHEP05(2024)203
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DOI: https://doi.org/10.1007/JHEP05(2024)203