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Natural quasi-alignment with two Higgs doublets and RGE stability

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Natural quasi-alignment with two Higgs doublets and RGE stability

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dc.contributor.author	Botella Olcina, Francisco J.
dc.contributor.author	Branco, Gustavo Castelo
dc.contributor.author	Coutinho, Antonio M.
dc.contributor.author	Rebelo, M. N.
dc.contributor.author	Silva-Marcos, J.I.
dc.date.accessioned	2016-04-21T10:57:40Z
dc.date.available	2016-04-21T10:57:40Z
dc.date.issued	2015
dc.identifier.citation	Botella Olcina, Francisco J. Branco, Gustavo Castelo Coutinho, Antonio M. Rebelo, M. N. Silva-Marcos, J.I. 2015 Natural quasi-alignment with two Higgs doublets and RGE stability European Physical Journal C 75 6 286 - 1 286 - 9
dc.identifier.uri	http://hdl.handle.net/10550/52958
dc.description.abstract	In the context of two Higgs doublet models, we study the conditions required in order to have stable quasi-alignment in flavour space. We show that stability under the renormalisation group equations imposes strong constraints on the flavour structure of the Yukawa couplings associated to each one of the Higgs doublets. In particular, we find a novel solution, where all Yukawa couplings are proportional to the so-called democratic matrix. This solution is rather unique, since it is the only stable solution which is a good starting point for reproducing the observed pattern of quark masses and mixing. We also showthat this stable solution can be obtained by imposing on the Lagrangian a Z(3)xZ(3)' flavour symmetry. Quark masses of the lighter quark generations are generated through the breaking of this discrete symmetry, and, at this stage, scalar-mediated flavour-changing neutralcurrents arise, but they are naturally suppressed by the smallness of the light quark masses. In this way, we relate Higgs alignment to the hierarchy of the quark masses through a discrete family symmetry.
dc.language.iso	eng
dc.relation.ispartof	European Physical Journal C, 2015, vol. 75, num. 6, p. 286 - 1-286 - 9
dc.subject	Física
dc.title	Natural quasi-alignment with two Higgs doublets and RGE stability
dc.type	journal article	es_ES
dc.date.updated	2016-04-21T10:57:41Z
dc.identifier.doi	10.1140/epjc/s10052-015-3487-5
dc.identifier.idgrec	107604
dc.rights.accessRights	open access	es_ES