Suppression of scalar mediated FCNCs in a SU(3)(c) x SU(3)(L) x U(1)(X) -model

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Huitu , K & Koivunen , N 2019 , ' Suppression of scalar mediated FCNCs in a SU(3)(c) x SU(3)(L) x U(1)(X) -model ' , Journal of High Energy Physics , no. 10 , 065 . https://doi.org/10.1007/JHEP10(2019)065

Title: Suppression of scalar mediated FCNCs in a SU(3)(c) x SU(3)(L) x U(1)(X) -model
Author: Huitu, Katri; Koivunen, Niko
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2019-10-07
Language: eng
Number of pages: 41
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/306666
Abstract: The models based on SU(3)C x SU(3)L x U(1)X gauge symmetry (331-models) have been advocated to explain the number of fermion families. These models place one quark family to a different representation than the other two. The traditional 331-models are plagued by scalar mediated quark flavour changing neutral currents (FCNC) at tree- level. So far there has been no concrete mechanisms to suppress these FCNCs in 331- models. Recently it has been shown that the Froggatt-Nielsen mechanism can be incorporated into the 331-setting in an economical fashion (FN331-model). The FN331-model explains both the number of fermion families in nature and their mass hierarchy simultaneously. In this work we study the Higgs mediated quark FCNCs in FN331-model. The flavour violating couplings of quarks are suppressed by the ratio of the SU(2)L x U(1)Y and SU(3)L x U(1)X breaking scales. We find that the SU(3)L x U(1)X -breaking scale can be as low as 5 TeV in order to pass the flavour bounds.
Subject: Beyond Standard Model
Global Symmetries
Quark Masses and SM Parameters
Spontaneous Symmetry Breaking
SECTOR
MECHANISM
MASSES
114 Physical sciences
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