The Physics of a Sextet Quark Sector∗

Electroweak symmetry breaking can be a consequence of color sextet quark chiral symmetry breaking, with sextet pions producing the longitudinal components of the electroweak vector bosons. If so, a special solution of QCD is involved, for which the high-energy S-Matrix can be constructed “semiperturbatively” via the chiral anomaly and reggeon diagrams. An infra-red fixed point and the starting point of color superconductivity are crucial components of the construction of the massless theory. The spectrum is consistent with, but is more limited than is required by, confinement and chiral symmetry breaking. Infinite momentum physical states contain both quarks and a universal “anomalous wee gluon” component. The pomeron is approximately a regge pole and the Critical Pomeron describes asymptotic cross-sections. Because the electroweak mass scale is related to the wee gluon coupling to sextet quarks, the pomeron couples strongly to the electroweak sector. This coupling could produce large x and Q2 events at HERA, and vector boson pairs at Fermilab. Further evidence for the sextet sector at Fermilab would be a large ET jet excess due, in part, to the non-evolution of αs, and other phenomena related to the possibility that top quark production is due to the η6. The sextet proton and neutron are the only new baryonic states, with masses that are ∼ 500 Gev. Sextet states will dominate high energy hadronic crosssections and, since sextet neutrons are absolutely stable, they could produce the dominance of dark matter in the universe and also, perhaps, ultra high energy cosmic rays. Other cosmic ray phenomena, particularly the spectrum knee, suggest that the effective sextet sector threshold is between Fermilab and LHC energies. If this is the case, then large cross-section effects are to be expected at the LHC. Jet and vector boson cross-sections will be very much larger than expected and sextet baryons should also be produced. Double pomeron produced states could provide definitive evidence for the existence of the sextet sector in the initial low luminosity running of the LHC. Work supported by the U.S. Department of Energy under Contract W-31-109-ENG-38 [email protected]