The recent groundbreaking discovery of nonzero neutrino masses and oscillations is strong evidence of physics beyond the SM. The gauge symmetry of the SM as well as those of many extensions fixes only the structure of gauge bosons. The fermions and Higgs contents have to be chosen somewhat arbitrarily.

In this special issue, we would like to address models in which the SM non-Abelian gauge symmetries are extended. Examples of such extensions are Left-Right Symmetric Model, the models based on the SU(3)C ⊗ SU(3)L ⊗ U(1)X gauge group, called 3-3-1 models, Little Higgs models, gauge Higgs unification, and so forth.

The models contain new particles such as exotic quarks, bileptons, etc at a scale only slightly above the SM scale (typically TeV), whose signatures can manifest themselves at the early stage of the LHC, or future linear colliders.

We invite investigators to contribute original research as well as review articles. Potential topics include, but are not limited to:

• Extensions of the standard model
• Quark and neutrino masses and mixing
• New physics at the LHC and other colliders
• Implications for cosmology

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/ahep/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/ according to the following timetable: