Quark pair condensation and chiral symmetry breaking in QCD
1982; Elsevier BV; Volume: 199; Issue: 1 Linguagem: Inglês
10.1016/0550-3213(82)90570-3
ISSN1873-1562
AutoresJ. Finger, Jeffrey E. Mandula,
Tópico(s)High-Energy Particle Collisions Research
ResumoIf the effective qq interaction strength due to gluon exchange becomes at least moderately strong beyond some distance g2/4π > 98, the perturbative vacuum becomes unstable to the creation of color singlet qq pairs, which indicates that the true vacuum contains a condensate of such pairs. We analyze the condensation by a coherent state variational procedure modeled after the BCS superconductor, and show that this method is equivalent to a self-consistent Hartree-Fock approximation to the Schwinger-Dyson equation for the quark propagator. The condensate leads to a spontaneous breakdown of chiral symmetry in the manner discussed by Nambu and Jona-Lasinio. The massive pseudoparticles with quark quantum numbers are identified with the "constituent" quarks.
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