Systematic study of the SU(3) c ⊗SU(3) L ⊗ U(1) X local gauge symmetry (original) (raw)

SYSTEMATIC STUDY OF THE SU(3) c ⊗SU(4) L ⊗U(1) X GAUGE SYMMETRY

Modern Physics Letters A, 2007

We carry a systematic study of possible extensions of the standard model based on the gauge group SU (3) c ⊗SU (4) L ⊗U (1) X . We consider both models with particles with exotic electric charges and models which do not contain exotic electric charges neither in the gauge boson sector nor in the fermion sector. For the first case an infinite number of models can, in principle, be constructed, while the restriction to non-exotic electric charges only allows for eight different anomaly-free models. Four of them are three-family models in the sense that anomalies cancel by an interplay between the three families, and another two are one-family models where anomalies cancel family by family as in the standard model. The remaining two are two-family models.

Systematic study of the SU(3)_c X SU(4)_L X U(1)_X gauge symmetry

2006

We carry a systematic study of possible extensions of the standard model based on the gauge group SU(3)_c X SU(4)_L X U(1)_X. We consider both models with particles with exotic electric charges and models which do not contain exotic electric charges neither in the gauge boson sector nor in the fermion sector. For the first case an infinite number of models can, in principle, be constructed, while the restriction to non-exotic electric charges only allows for eight different anomaly-free models. Four of them are three-family models in the sense that anomalies cancel by an interplay between the three families, and another two are one-family models where anomalies cancel family by family as in the standard model. The remaining two are two-family models.

ANALYSIS OF SU(3)c⊗SU(3)L ⊗U(1)X LOCAL GAUGE THEORY

International Journal of Modern Physics A, 2002

Six different models, straightforward extensions of the standard model to of SU (3)c ⊗ SU (3)L ⊗ U (1)X, which do not contain particles with exotic electric charges are presented. Two of the models are one family and four are three family models. In two of the three family models one of the families transforms different from the others, and in the other two all the three families are different.

Analysis of SU(3)_c X SU(3)_L X U(1)_X local gauge theory

2001

Six different models, straightforward extensions of the standard model to SU(3)_c X SU(3)_L X U(1)_X, which do not contain particles with exotic electric charges are described. Two of the models are one family and four are three family models. In two of the three family models one of the families transforms different from the others, and in the other two all the three families are different.

Gauge bosons and fermions in SU(3)C x SU(4)L x U(1)X model with SU(2)H xU(1)AH symmetry

2009

We present a phenomenological study of neutral gauge bosons and fermions in an extended Standard model with SU(3)C x SU(4)L x U(1)X gauge symmetry.The model includes gauge bosons and fermions without exotic charges and is distinguished by the symmetry-breaking patern SU(4)L->SU(2)L x SU(2)H x U(1)AH. This introduces an extended electroweak symmetry group SU(2)L x SU(2)H at low energies.We recover the fermion spectra of an anomaly-free three-family 3-4-1 modelwithout exotic chargesfor U(1)X charge X = T3R+(B-L)/2.The interaction of physical neutral gauge bosons Zprime,Z double prime and exotic fermions are presented along with their masses and mixing angle.The electroweak constraints from oblique corections on the model are also calculated.

SU(3){sub c} x SU(3){sub L} x U(1){sub X} models with four families

Phys Rev D, 2010

In the context of the local gauge group SU (3) c ⊗ SU (3) L ⊗ U (1) X , we look for possible four family models, where all the particles carry ordinary electric charges. Thirteen different anomalyfree fermion structures emerge, out of which only two are realistic. For the simplest physical structure, we calculate the charged and neutral weak currents and the tree-level Fermion masses. We also look for new sources of flavor changing neutral currents in the quark sector, in connection with the upcoming experimental results at the Large Hadron Collider.

SU(3)cøtimes SU(3)Løtimes U(1)X models with four families

2010

In the context of the local gauge group SU (3) c ⊗ SU (3) L ⊗ U (1) X , we look for possible four family models, where all the particles carry ordinary electric charges. Thirteen different anomalyfree fermion structures emerge, out of which only two are realistic. For the simplest physical structure, we calculate the charged and neutral weak currents and the tree-level Fermion masses. We also look for new sources of flavor changing neutral currents in the quark sector, in connection with the upcoming experimental results at the Large Hadron Collider.

SU(3)C⊗SU(3)L⊗U(1)X gauge symmetry from SU(4)PS⊗SU(4)L+R

Physical Review D, 2005

We consider an extension of the standard model gauge symmetry to a local gauge group SU(3) C ⊗SU(3) L ⊗U(1) X which is a subgroup of SU(4) PS ⊗ SU(4) L+R .The symmetry breaking pattern is SU(4) SU(3) ⊗U(1) for both weak SU(4) L+R and strong Pati-Salam SU(4) PS group. The SU(3) C ⊗U(1) B-L ⊗SU(3) L ⊗U(1) Y1 (3-3-1-1) local gauge symmetry breaks to SU(3) C ⊗SU(3) L ⊗U(1) X and generates a 3-3-1 model with threegeneration, 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) L gauge bosons (B-L = 0) do not include bilepton gauge boson.The neutral gauge bosons include γ, Z, Z / and a fourth, heavy gauge boson Z // which decouples from rest but can decay to ordinary fermions. An analysis for two-body decays of neutral Z / gauge boson is presented .From Yukawa interactions, the masses of all exotic fermions are obtained in the TeV region .This restricts Z / decays to exotic fermions The Z / is also found to be leptophobic and decays mainly to quarks.

SU(3)c⊗SU(3)L⊗U(1)X models with four families

Physical Review D, 2010

In the context of the local gauge group SU(3)c⊗SU(3)L⊗U(1)X, we look for possible four family models, where all the particles carry ordinary electric charges. Thirteen different anomaly-free fermion structures emerge, out of which only two are realistic. For the simplest physical structure, we calculate the charged and neutral weak currents and the tree-level Fermion masses. We also look for new sources of flavor changing neutral currents in the quark sector in connection with the upcoming experimental results at the Large Hadron Collider.

Phenomenology of the SU(3)c?SU(3)L?U(1)X model with exotic charged leptons

Physical Review D Particles and Fields, 2007

A phenomenological analysis of the three-family model based on the local gauge group SU(3)c⊗SU(3)L⊗U(1)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.