Flavor puzzle in three Higgs-doublet models: Insights from BGL and lessons from flavor data

Dipankar Das; Miguel Levy; Anugrah M. Prasad

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arXiv · 2502.20296

Flavor puzzle in three Higgs-doublet models: Insights from BGL and lessons from flavor data

Dipankar Das·Miguel Levy·Anugrah M. Prasad

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Abstract

We study a variant of the 3HDM, referred to as the BGL-3HDM, incorporating a $U(1)_1\times U(1)_2$ 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 FCNCs in these sectors. FCNC interactions mediated by neutral nonstandard Higgses are confined to the up-quark sector only. No new BSM parameters are introduced by the Yukawa sector of the model, making it as economical as the NFC versions of 3HDM with a $U(1)_1\times U(1)_2$ 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.

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Dipankar Das, Miguel Levy, Anugrah M. Prasad. 2025-02-27. Flavor puzzle in three Higgs-doublet models: Insights from BGL and lessons from flavor data. https://arxiv.org/abs/2502.20296

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