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Flavour constraints on multi-Higgs-doublet models: Yukawa alignment · Around

2010

Flavour constraints on multi-Higgs-doublet models: Yukawa alignment

Pich, Antonio

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In multi-Higgs-doublet models, the alignment in flavour space of all Yukawa matrices coupling to a given right-handed fermion guarantees the absence of tree-level flavour-changing neutral couplings, while introducing new sources of CP violation.

With N Higgs doublets (and no right-handed neutrinos) the Yukawa Lagrangian is characterized by the fermion masses, the CKM quark mixing matrix and 3(N-1) complex couplings.
Quantum corrections break the alignment, generating a minimal-flavour-violation structure with flavour-blind phases.
The aligned multi-Higgs-doublet models lead to a rich and viable phenomenology with an interesting hierarchy of flavour-changing neutral current effects, suppressing them in light-quark systems while allowing potentially relevant signals in heavy-quark transitions.

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