Higgs phenomenology in the minimal $SU(3{)}_{L}xU(1{)}_{X}$ model
Abstract
Here, we investigate the phenomenology of a model based on the SU(3)_{c}×SU(3)_{L}×U(1)_{X} gauge theory, the socalled 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 CPeven 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 B^{0}$$\bar{B}$$^{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 modellike Higgs boson is predicted, which has a different pattern from that seen in two Higgs doublet models with a softlybroken Z_{2} 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.
 Authors:

 Korea Inst. for Advanced Study (KIAS), Seoul (Korea, Republic of). School of Physics; National Center for Theoretical Sciences, Hsinchu (Taiwan). Physics Division
 Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
 Korea Inst. for Advanced Study (KIAS), Seoul (Korea, Republic of). School of Physics; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
 Univ. of Southampton (United Kingdom). School of Physics and Astronomy
 Publication Date:
 Research Org.:
 Univ. of Alabama, Tuscaloosa, AL (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP)
 OSTI Identifier:
 1365626
 Alternate Identifier(s):
 OSTI ID: 1260295
 Grant/Contract Number:
 SC0013680
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 24700010
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Okada, Hiroshi, Okada, Nobuchika, Orikasa, Yuta, and Yagyu, Kei. Higgs phenomenology in the minimal SU(3)LxU(1)X model. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.94.015002.
Okada, Hiroshi, Okada, Nobuchika, Orikasa, Yuta, & Yagyu, Kei. Higgs phenomenology in the minimal SU(3)LxU(1)X model. United States. https://doi.org/10.1103/PhysRevD.94.015002
Okada, Hiroshi, Okada, Nobuchika, Orikasa, Yuta, and Yagyu, Kei. Tue .
"Higgs phenomenology in the minimal SU(3)LxU(1)X model". United States. https://doi.org/10.1103/PhysRevD.94.015002. https://www.osti.gov/servlets/purl/1365626.
@article{osti_1365626,
title = {Higgs phenomenology in the minimal SU(3)LxU(1)X model},
author = {Okada, Hiroshi and Okada, Nobuchika and Orikasa, Yuta and Yagyu, Kei},
abstractNote = {Here, we investigate the phenomenology of a model based on the SU(3)c×SU(3)L×U(1)X gauge theory, the socalled 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 CPeven 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 modellike Higgs boson is predicted, which has a different pattern from that seen in two Higgs doublet models with a softlybroken 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.},
doi = {10.1103/PhysRevD.94.015002},
journal = {Physical Review D},
number = 1,
volume = 94,
place = {United States},
year = {2016},
month = {7}
}
Web of Science
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