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Title: Higgs phenomenology in the minimal S U ( 3 ) L x U ( 1 ) X model

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4]
  1. Korea Inst. for Advanced Study (KIAS), Seoul (Korea, Republic of). School of Physics; National Center for Theoretical Sciences, Hsinchu (Taiwan). Physics Division
  2. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
  3. Korea Inst. for Advanced Study (KIAS), Seoul (Korea, Republic of). School of Physics; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
  4. Univ. of Southampton (United Kingdom). School of Physics and Astronomy

Here, we investigate the phenomenology of a model based on the SU(3)c×SU(3)L×U(1)X gauge theory, the so-called 331 model. Particularly, we focus on the Higgs sector of the model which is composed of three SU(3)L triplet Higgs fields, and this corresponds to the minimal form to realize phenomenologically acceptable scenario. After the spontaneous symmetry breaking SU(3)L×U(1)X→SU(2)L×U(1)Y, our Higgs sector effectively becomes that with two SU(2)L doublet scalar fields, in which the first and the second generation quarks couple to the different Higgs doublet from that couples to the third generation quarks. Furthermore, this structure causes the flavour changing neutral current mediated by Higgs bosons at the tree level. By taking an alignment limit of the mass matrix for the CP-even Higgs bosons, which is naturally realized in the case with the breaking scale of SU(3)L×U(1)X to be much larger than that of SU(2)L×U(1)L, we can avoid current constraints from flavour experiments such as the B0-$$\bar{B}$$0 mixing even for the Higgs bosons masses being O(100) GeV. In this allowed parameter space, we clarify that a characteristic deviation in quark Yukawa couplings of the standard model-like Higgs boson is predicted, which has a different pattern from that seen in two Higgs doublet models with a softly-broken Z2 symmetry. We also find that the flavour violating decay modes of the extra Higgs boson, e.g., H/A→tc and H±→ts can be dominant, and they yield the important signature to distinguish our model from the two Higgs doublet models.

Research Organization:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0013680
OSTI ID:
1365626
Alternate ID(s):
OSTI ID: 1260295
Journal Information:
Physical Review D, Vol. 94, Issue 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Lepton number violation in 331 models text January 2016

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