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Title: Phenomenology of the SU(3){sub c}xSU(3){sub L}xU(1){sub X} model with exotic charged leptons

Abstract

A phenomenological analysis of the three-family model based on the local gauge group SU(3){sub c}xSU(3){sub L}xU(1){sub X} with exotic charged leptons, is carried out. Instead of using the minimal scalar sector able to break the symmetry in a proper way, we introduce an alternative set of four Higgs scalar triplets, which combined with an anomaly-free discrete symmetry, produce quark and charged lepton mass spectrum without hierarchies in the Yukawa coupling constants. We also embed the structure into a simple gauge group and show some conditions to achieve a low energy gauge coupling unification, avoiding possible conflict with proton decay bounds. By using experimental results from the CERN-LEP, SLAC linear collider, and atomic parity violation data, we update constraints on several parameters of the model.

Authors:
 [1];  [2]; ;  [1]
  1. Instituto de Fisica, Universidad de Antioquia, Apartado Aereo 1226, Medellin (Colombia)
  2. (Colombia)
Publication Date:
OSTI Identifier:
21020310
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.075016; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COUPLING; HIGGS BOSONS; HIGGS MODEL; LEP STORAGE RINGS; LEPTONS; LINEAR COLLIDERS; MASS SPECTRA; P INVARIANCE; PARITY; PARTICLE DECAY; PROTONS; QUARKS; SCALARS; STANFORD LINEAR ACCELERATOR CENTER; SU-3 GROUPS; SYMMETRY; TRIPLETS; YUKAWA POTENTIAL

Citation Formats

Salazar, Juan C., Departamento de Fisica, Universidad de Narino, Apartado Aereo 1175, Pasto, Ponce, William A., and Gutierrez, Diego A.. Phenomenology of the SU(3){sub c}xSU(3){sub L}xU(1){sub X} model with exotic charged leptons. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.075016.
Salazar, Juan C., Departamento de Fisica, Universidad de Narino, Apartado Aereo 1175, Pasto, Ponce, William A., & Gutierrez, Diego A.. Phenomenology of the SU(3){sub c}xSU(3){sub L}xU(1){sub X} model with exotic charged leptons. United States. doi:10.1103/PHYSREVD.75.075016.
Salazar, Juan C., Departamento de Fisica, Universidad de Narino, Apartado Aereo 1175, Pasto, Ponce, William A., and Gutierrez, Diego A.. Sun . "Phenomenology of the SU(3){sub c}xSU(3){sub L}xU(1){sub X} model with exotic charged leptons". United States. doi:10.1103/PHYSREVD.75.075016.
@article{osti_21020310,
title = {Phenomenology of the SU(3){sub c}xSU(3){sub L}xU(1){sub X} model with exotic charged leptons},
author = {Salazar, Juan C. and Departamento de Fisica, Universidad de Narino, Apartado Aereo 1175, Pasto and Ponce, William A. and Gutierrez, Diego A.},
abstractNote = {A phenomenological analysis of the three-family model based on the local gauge group SU(3){sub c}xSU(3){sub L}xU(1){sub X} with exotic charged leptons, is carried out. Instead of using the minimal scalar sector able to break the symmetry in a proper way, we introduce an alternative set of four Higgs scalar triplets, which combined with an anomaly-free discrete symmetry, produce quark and charged lepton mass spectrum without hierarchies in the Yukawa coupling constants. We also embed the structure into a simple gauge group and show some conditions to achieve a low energy gauge coupling unification, avoiding possible conflict with proton decay bounds. By using experimental results from the CERN-LEP, SLAC linear collider, and atomic parity violation data, we update constraints on several parameters of the model.},
doi = {10.1103/PHYSREVD.75.075016},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • We consider an extension of the standard model gauge symmetry to a local gauge group SU(3){sub C}xSU(3){sub L}xU(1){sub X} which is a subgroup of SU(4){sub PS}xSU(4){sub L+R}. The symmetry breaking pattern is SU(4){yields}SU(3)xU(1) for both weak SU(4){sub L+R} and strong Pati-Salam SU(4){sub PS} group. The SU(3){sub C}xU(1){sub B-L}xSU(3){sub L}xU(1){sub Y1} (3-3-1-1) local gauge symmetry breaks to SU(3){sub C}xSU(3){sub L}xU(1){sub X} and generates a 3-3-1 model with three-generation, anomaly-free fermions which transform as bifundamentals of (3-3-1-1). The 3-3-1 model is of Pleitez-Frampton type but SU(3){sub L} gauge bosons (B-L=0) do not include bilepton gauge boson. The neutral gauge bosons include {gamma},Z,Z{supmore » '} and a fourth, heavy gauge boson Z{sup ''} which decouples from rest but can decay to ordinary fermions. An analysis for two-body decays of neutral Z{sup '} gauge boson is presented. From Yukawa interactions, the masses of all exotic fermions are obtained in the TeV region. This restricts Z{sup '} decays to exotic fermions. The Z{sup '} is also found to be leptophobic and decays mainly to quarks.« less
  • The SU(3){sub C}xSU(3){sub L}xU(1){sub X} gauge model with the minimal scalar sector (two Higgs triplets) is studied in detail. One of the vacuum expectation values u is a source of lepton-number violations and a reason for the mixing among the charged gauge bosons--the standard model W and the bilepton (with L=2) gauge bosons as well as among neutral non-Hermitian X{sup 0} and neutral gauge bosons: the photon, the Z, and the new Z{sup '}. Because of these mixings, the lepton-number violating interactions exist in both charged and neutral gauge boson sectors. An exact diagonalization of the neutral gauge boson sectormore » is derived and bilepton mass splitting is also given. The lepton-number violation happens only in the neutrino but not in the charged lepton sector. In this model, lepton-number changing ({delta}L={+-}2) processes exist but only in the neutrino sector. Constraints on vacuum expectation values of the model are estimated and u{approx_equal}O(1) GeV, v{approx_equal}v{sub weak}=246 GeV, and {omega}{approx_equal}O(1) TeV.« less
  • We investigate a simple model of neutrino mass based on SU(3){sub C}xSU(3){sub L}xU(1){sub X} gauge unification. The Yukawa coupling of the model has automatic lepton-number symmetry which is broken only by the self-couplings of the Higgs boson. At tree level, the neutrino spectrum contains three Dirac fermions, one massless and two degenerate in mass. At the two-loop level, neutrinos obtain Majorana masses and correct the tree-level result which naturally gives rise to an inverted hierarchy mass pattern and interesting mixing which can fit the current data with minor fine-tuning. In another scenario, one can pick the scales such that themore » loop-induced Majorana mass matrix is bigger than the Dirac one and thus reproduces the usual seesaw mechanism.« less
  • In the original version of the minimal SU(3){sub C}xSU(3){sub L}xU(1){sub N} model the masses of all quarks are correctly obtained by introducing three scalar triplets into the model; meanwhile the lepton mass generation requires the introduction of at least one scalar sextet. In this work we show that this scalar sextet is unable to yield the correct neutrino masses and mixing. In order to solve this puzzle in the most economical way, we evoke an additional Z{sub 3} discrete symmetry, without including this sextet in the scalar spectrum, and propose a truly minimal 3-3-1 model capable of generating the correctmore » masses and mixing of all fermions. Moreover, we show that our proposal leads to naturally light neutrinos with masses in the eV range, obtained with three scalar triplets only. Finally, the so-called minimal 3-3-1 model is also in danger due to the presence of undesirable effective operators that lead to proton decay unless they are suppressed by extremely small couplings or, as we choose to employ in this work, are eliminated by some discrete symmetry.« less
  • Using experimental results at the Z-pole and atomic parity violation, we perform a {chi}{sup 2} fit at 95% C.L. to obtain family-dependent bounds to Z{sub 2} mass and Z{sub {mu}}-Z{sub {mu}}{sup '} mixing angle {theta} in the framework of SU(3){sub c}xSU(3){sub L}xU(1){sub X} models. The allowed regions depend on the assignment of the quark families in mass eigenstates into the three different families in weak eigenstates that cancel anomalies.