Abstract
The most general two-Higgs doublet model (2HDM) includes potentially large sources of flavor changing neutral currents (FCNCs) that must be suppressed in order to achieve a phenomenologically viable model. The flavor alignment ansatz postulates that all Yukawa coupling matrices are diagonal when expressed in the basis of mass-eigenstate fermion fields, in which case tree-level Higgs-mediated FCNCs are eliminated. In this work, we explore models with the flavor alignment condition imposed at a very high energy scale, which results in the generation of Higgs-mediated FCNCs via renormalization group running from the high energy scale to the electroweak scale. Using the current experimental bounds on flavor changing observables, constraints are derived on the aligned 2HDM parameter space. In the favored parameter region, we analyze the implications for Higgs boson phenomenology.
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Gori, S., Haber, H.E. & Santos, E. High scale flavor alignment in two-Higgs doublet models and its phenomenology. J. High Energ. Phys. 2017, 110 (2017). https://doi.org/10.1007/JHEP06(2017)110
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DOI: https://doi.org/10.1007/JHEP06(2017)110