Chiral color

In particle physics phenomenology, chiral color is a speculative model^[1] which extends quantum chromodynamics (QCD), the generally accepted theory for the strong interactions of quarks. QCD is a gauge field theory based on a gauge group known as color SU(3)_C with an octet of colored gluons known as gluons acting as the force carriers between a triplet of colored quarks.

In Chiral Color, QCD is extended to a gauge group which is SU(3)_L × SU(3)_R and leads to a second octet of force carriers. SU(3)_C is identified with a diagonal subgroup of these two factors. The gluons correspond to the unbroken gauge bosons and the color octet axigluons -- which couple strongly to the quarks—are massive. Hence the name is Chiral Color. Although Chiral Color has presently no experimental support—which is not really any worse than most models currently investigated—it has the "aesthetic" advantage of rendering the Standard Model more similar in its treatment of the two short range forces, strong and weak interactions.

Unlike gluons, the axigluons are predicted to be massive. Extensive searches for axigluons at CERN^[2] and Fermilab^[3][4] have successfully placed a lower bound on the axigluon mass of about 1 TeV. Axigluons may be discovered when collisions are studied with higher energy at the Large Hadron Collider.

References

1. ^ Paul H. Frampton and Sheldon L. Glashow (1987). "Chiral Color: An Alternative to the Standard Model". Physics Letters B 190: 157. Bibcode 1987PhLB..190..157F. doi:10.1016/0370-2693(87)90859-8. 
2. ^ C. Albajar et al. (UA1 collaboration) (1988). "Two-jet mass distributions at the CERN proton-antiproton collider". Physics Letters B 209: 127. Bibcode 1988PhLB..209..127A. doi:10.1016/0370-2693(88)91843-6. 
3. ^ F. Abe et al. (CDF Collaboration) (1990). "Two-jet invariant mass distribution at s^1⁄₂ = 1.8 TeV". Physical Review D 41 (5): 1722. Bibcode 1990PhRvD..41.1722A. doi:10.1103/PhysRevD.41.1722. 
4. ^ F. Abe et al. (CDF Collaboration) (1997). "Search for new particles decaying to dijets at CDF". Physical Review D 55 (9): 5263. arXiv:hep-ex/9702004. Bibcode 1997PhRvD..55.5263A. doi:10.1103/PhysRevD.55.R5263.