期刊
PHYSICS LETTERS B
卷 688, 期 4-5, 页码 341-344出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2010.04.033
关键词
Multi-Higgs models; Renormalization group equations; Flavor changing neutral currents
资金
- Portuguese Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/FIS/70156/2006]
- FCT
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/70156/2006] Funding Source: FCT
We write down the renormalization-group equations for the Yukawa-coupling matrices in a general multi-Higgs-doublet model. We then assume that the matrices of the Yukawa couplings of the various Higgs doublets to right-handed fermions of fixed quantum numbers are all proportional to each other. We demonstrate that, in the case of the two-Higgs-doublet model, this proportionality is preserved by the renormalization-group running only in the cases of the standard type-I, II, X, and Y models. We furthermore show that a similar result holds even when there are more than two Higgs doublets: the Yukawa-coupling matrices to fermions of a given electric charge remain proportional under the renormalization-group running if and only if there is a basis for the Higgs doublets in which all the fermions of a given electric charge couple to only one Higgs doublet. (c) 2010 Elsevier B.V. All rights reserved.
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