Effects of quark family nonuniversality in SU(3)_c X SU(4)_L X U(1)_x models

Abstract

Flavour changing neutral currents arise in the $SU(3{)}_c\otimes SU(4{)}_L\otimes U(1{)}_X$ extension of the standard model because anomaly cancellation among the fermion families requires one generation of quarks to transform differently from the other two under the gauge group. In the weak basis the distinction between quark families is meaningless. However, in the mass eigenstates basis, the Cabibbo-Kobayashi-Maskawa mixing matrix motivates us to classify left-handed quarks in families. In this sense there are, in principle, three different assignments of quark weak eigenstates into mass eigenstates. In this work, by using measurements at the Z-pole, atomic parity violation data and experimental input from neutral meson mixing, we examine two different models without exotic electric charges based on the 3-4-1 symmetry, and address the effects of quark family nonuniversality on the bounds on the mixing angle between two of the neutral currents present in the models and on the mass scales $M_{Z_2}$ and $M_{Z_3}$ of the new neutral gauge bosons predicted by the theory. The heaviest family of quarks must transform differently in order to keep lower bounds on $M_{Z_2}$ and $M_{Z_3}$ as low as possible without violating experimental constraints.

arXiv comment27 pages, 10 tables, 2 figures. Equation (19) and typos corrected. Matches version to appear in Phys. Rev. D

References in corpus (55)

• $SU(3)\otimes U(1)$ Model for Electroweak Interactions
• Violations of fundamental symmetries in atoms and tests of unification theories of elementary particles
• $\mbox{SU}(3)_L \otimes \mbox{U}(1)_N$ and $\mbox{SU}(4)_L \otimes \mbox{U}(1)_N$ gauge models with right-handed neutrinos
• Observation of Bs-Bsbar Oscillations
• Extra Families, Higgs Spectrum and Oblique Corrections
• Updated Estimate of Running Quark Masses
• 2HDMs predictions for $B\to X_s\gamma$ in NLO QCD
• The Little Higgs from a Simple Group
• The 331 model with right-handed neutrinos
• Direct Limits on the Bs Oscillation Frequency
• Rare and CP-Violating K and B Decays in the Littlest Higgs Model with T-Parity
• SU(3)_LxU(1)_N Model for Right-Handed Neutrino Neutral Currents
• Number of Fermion Generations Derived from Anomaly Cancellation
• The electroweak theory of SU(3) $\times$ U(1)
• Next--to--Leading Order QCD corrections for the $B^0\overline{B^0}$--mixing with an extended Higgs sector
• Heavy Charged Leptons in an $SU(3{)}_L\otimes U(1{)}_N$ Model
• Introducing the Little Higgs
• Improved Measurement of cal{B}(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_{D^+}
• Reconciliation of the Measurement of Parity-Nonconservation in Cs with the Standard Model
• Extra quark-lepton generations and precision measurements
• D-Dbar mixing and new physics: general considerations and constraints on the MSSM
• Lepton flavor changing processes and CP violation in the 331 model
• Extra generations and discrepancies of electroweak precision data
• Analysis of SU(3)_c X SU(3)_L X U(1)_X local gauge theory
• Flavor changing neutral currents in $SU(3)\otimes U(1)$ models
• Experimental constraints on fourth generation quark masses
• $SU(4{)}_L\otimes U(1{)}_N$ model for the electroweak interactions
• Flavor Changing Neutral Current Effects and CP Violation in the Minimal 3-3-1 Model
• FCNC and Rare B Decays in 3-3-1 Models
• Generation non-universality and flavor changing neutral currents in the 331 model
• Atomic Parity Violation : Principles, Recent Results, Present Motivations
• New fermions and a vector-like third generation in $SU(3{)}_c\otimes SU(3{)}_L\otimes U(1{)}_N$ models
• Neutrinoless double beta decay in an $SU(3{)}_L\otimes U(1{)}_N$ model
• Recent results from lattice calculations
• Higher Dimensional Supersymmetry as an Origin of the Three Families for Quarks and Leptons
• Spontaneously Broken Technicolor and the Dynamics of Virtual Vector Technimesons
• Particle-Antiparticle Mixing, epsilon_K, Delta Gamma_q, A_SL^q, A_CP(B_d -> psi K_S), A_CP(B_s -> psi phi) and B -> X_{s,d} gamma in the Littlest Higgs Model with T-Parity
• Role of Present and Future Atomic Parity Violation Experiments in Precision Electroweak Tests
• Systematic study of the SU(3)_c X SU(4)_L X U(1)_X gauge symmetry
• Negative T from a dynamical left-handed neutrino mass
• Anomalies and Fermion Content of Grand Unified Theories in Extra Dimensions
• SU(3)_c X SU(4)_L X U(1)_x without exotic electric charges
• The Fourth SM Family Neutrino at Future Linear Colliders
• Charm as a domain wall fermion in quenched lattice QCD
• $SU(n)\otimes U(1{)}_c$ gauge models with spontaneous symmetry breaking
• $S{U}_L(4)\times U(1)$ model for electroweak unification and sterile neutrinos
• SU(4)_L X U(1)_X three-family model for the electroweak interaction
• Phenomenology of the SU(3)_c X SU(3)_L X U(1)_X model with right-handed neutrinos
• Little Higgs Model Completed with a Chiral Fermionic Sector
• The Electric Charge Assignment in $SU(4{)}_L\otimes U(1{)}_Y$ Gauge Models
• Phenomenology of the $SU(3{)}_c\otimes SU(3{)}_L\otimes U(1{)}_X$ model with exotic charged leptons
• Flavor changing neutral currents with a fourth family of quarks
• SU_L(4) x U(1) model for electroweak unification
• Flavor Democracy in Particle Physics
• Renormalization Group and Grand Unification with 331 Models

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• Dimension-five effective operators in electro-weak SU(4)xU(1) gauge models
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• Constraining heavy neutral gauge boson $Z^{\prime }$ in the 3 - 3 - 1 models by weak charge data of Cesium and proton
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• $SU(5{)}_L\times U(1{)}_Y$ electroweak unification
• $SU(4{)}_L\times U(1{)}_X$ models with little Higgs
• Weak charges in $SU(5{)}_L\times U(1{)}_Y$ gauge models
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