331 model

In particle physics, the 331 model is an extension of the electroweak gauge symmetry from $SU(2)\_W\; imes\; U(1)\_Y$ to $SU(3)\_L\; imes\; U(1)\_X$ with $SU(2)\_W\; subset\; SU(3)\_W$ and the hypercharge and the electric charge $Q=Y/2\; +\; T\_3/2$ where T₃ and T₈ are the Gell-Mann matrices of SU(3)_L and β and I are parameters of the model. The name 331 comes from the full gauge symmetry group $SU(3)\_C\; imes\; SU(3)\_L\; imes\; U(1)\_X$. The 331 model offers an explanation of why there must exist three families of quarks and leptons, a fact which isput in "by hand" in the Standard Model.

The minimal 331 model predicts singly- and doubly- charged spin-one bosons, bileptons, which could show upin electron-electron scattering when it is studied at TeV energy scales and may also be producedin multi TeV proton-proton scattering at the Large Hadron Collider as early as 2008.

References

* cite journal
author=Frampton, P.H
authorlink=Paul Frampton
title=CHIRAL DILEPTON MODEL AND THE FLAVOR QUESTION
journal=Phys. Rev. Lett.
volume=69
year=1992
pages=2889
url=http://ccdb4fs.kek.jp/cgi-bin/img_index?199207358
doi=10.1103/PhysRevLett.69.2889
* Pisano,F. and Pleitez, V. [http://arxiv.org/abs/hep-ph/9206242 An SU(3) x U(1) model for electroweak interactions]
* [http://arxiv.org/abs/hep-ph/9207264 Lepton masses in an SU(3)_L x U(1)_N gauge model]

ee also

*Standard Model
*Standard model (basic details)
*Beyond the Standard Model