Yukawa Alignment in the Two-Higgs-Doublet Model

By A. Pich, Paula Tuzón. 2009

373 citations recorded by the source corpus.

In multi-Higgs-doublet models the alignment in flavor space of the relevant Yukawa matrices guarantees the absence of tree-level flavor-changing couplings of the neutral scalar fields. We analyze the consequences of this condition within the two-Higgs-doublet model and show that it leads to a generic Yukawa structure which contains as particular cases all known specific implementations of the model based on Z{sub 2} symmetries. All possible freedom in the Yukawa sector gets parametrized in terms of three complex couplings {sigma}{sub f}. In spite of having flavor conservation in the neutral scalar couplings, the phases of these three parameters represent potential new sources of CP violation.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d631fe76f303b41de922c350b4e20b3aa4967c6f

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In Nuclear and High Energy Physics

Citations in the corpus

Maximally symmetric two Higgs doublet model with natural standard model alignment (2014, background): “In general, the absence of tree-level flavour-changing couplings of the neutral scalar fields can be guaranteed by requiring the Yukawa coupling matrices to be aligned in flavour space [10].”
Charged-Higgs phenomenology in the aligned two-Higgs-doublet model (2010, background): “In the A2HDM the mass-eigenstate Yukawa Lagrangian reads [1]”
Building and testing models with extended Higgs sectors (2017, background): “ found in [234]. However the avor-diagonal structure of these couplings is preserved, and no FCNC appear at tree level. A separate class of models is represented by the so-called aligned 2HDM (a2HDM) [235]. In this model, the fermions are allowed to couple to both Higgs doublets but their Yukawa mat”
Electric dipole moments in two-Higgs-doublet models (2013, background): “The contribution with a tau lepton in the loop, proportional to Im(y2l ) (Re(yl,11)Im(yl,33) and Re(yl,33)Im(yl,11)), is subject to strong cancellations in the A2HDM; there is therefore no conservative limit.”
Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour violation (2010, methodology): “[ 11 , 12]. Less trivial is to understand how these Yukawa interactions get modied after the inclusion of quantum corrections.”
Limiting two-Higgs-doublet models (2014, neutral): “[7].”