Perturbative QCD with quark and gluon condensates

✍ Scribed by Paul Hoyer

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 526 KB
• Volume: 117
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)90570-6

✦ Synopsis

The quark ψψ and gluon FµνF µν vacuum expectation values are non-vanishing at low orders in αs when the perturbative ground state includes quark and gluon pairs. This offers possibilities of studying the effects of a non-trivial vacuum using formally exact perturbative methods. The QCD Feynman rules are modified only for the free, on-shell quark and gluon propagators at zero four-momentum. Gauge and lorentz invariance is maintained, while chiral symmetry is spontaneously broken by the ground state.