Flavor puzzle in three-Higgs-doublet models: Insights from Branco-Grimus-Lavoura and lessons from flavor data
Year: 2025
Type: article
Abstract: We study a variant of the three-Higgs-doublet model (3HDM), referred to as the Branco-Grimus-Lavoura–(BGL-)3HDM, incorporating a U ( 1 ) 1 × U ( 1 ) 2 symmetry, which can distinguish the primary sources of mass for different fermion generations. In the version considered here, the Yukawa matrices in the down-quark and charged lepton sectors are diagonal, thereby eliminating tree-level flavor changing neutral currents (FCNCs) in these sectors. FCNC interactions mediated by neutral nonstandard Higgses are confined to the up-quark sector only. No new Beyond-Standard-Model parameters are introduced by the Yukawa sector of the model, making it as economical as the natural flavor conservation (NFC) versions of 3HDM with a U ( 1 ) 1 × U ( 1 ) 2 symmetry in terms of the number of free parameters. However, even in the down-quark and in the charged lepton sectors, flavor diagonal but nonuniversal Higgs couplings set this model apart from the NFC versions of the 3HDM.
DOI: 10.1103/hf9s-g762
Authors: Dipankar Das, Miguel Levy, Anugrah M. Prasad
Institutions: Indian Institute of Technology Indore, University of Basel
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4411426146