Abstract
The alternative [SU(3)]4 model of leptonic color and dark matter is discussed. It unifies at MU∼1014 GeV and has the low-energy subgroup SU(3)q×SU(2)l×SU(2)L×SU(2)R×U(1)X with (u,h)R instead of (u,d)R as doublets under SU(2)R. It has the built-in global U(1) dark symmetry which is generalized B–L. In analogy to SU(3)q quark triplets, it has SU(2)l hemion doublets which have half-integral charges and are confined by SU(2)l gauge bosons (stickons). In analogy to quarkonia, their vector bound states (hemionia) are uniquely suited for exploration at a future e−e+ collider.
Highlights
To venture beyond the Standard Model (SM) of quarks and leptons, there have been many trailblazing ideas
Is there a guiding principle? One such is supersymmetry, where the superpartners of the SM particles naturally belong to a dark sector
Another possible guiding principle proposed recently is to look for a dark symmetry embedded as a gauge symmetry in a unifying extension of the SM, such as [SU (3)]N
Summary
To venture beyond the Standard Model (SM) of quarks and leptons, there have been many trailblazing ideas. The three families of quarks and leptons are contained in the bifundamental chain (3, 3∗, 1, 1) + (1, 3, 3∗, 1) + (1, 1, 3, 3∗) + (3∗, 1, 1, 3) which include other fermions beyond the SM This unifying symmetry is broken by two bifundamental scalars at MU to SU (3)q × SU (2)l × SU (2)L × SU (2)R × U (1)X in such a way that a residual global U (1)D symmetry remains. This important property guarantees that a dark sector exists for a set of fermions, scalars, and vector gauge bosons. We will consider the phenomenology associated with the SU (2)R gauge symmetry and the possible dark-matter candidates of this model
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