Filling Perturbative Ground States
| dc.creator | Hoyer, Paul | |
| dc.date | 2003-04-02 | |
| dc.date.accessioned | 2026-07-07T03:49:22Z | |
| dc.date.available | 2026-07-07T03:49:22Z | |
| dc.description | I discuss a degree of freedom in formulating perturbation theory that is often neglected: the in- and out-states need not be empty. The inclusion of (free) particles in the asymptotic states modifies the on-shell prescription of the free propagator. This affects loop contributions -- but the modified expansion is {\it a priori} as justified as the standard one with Feynman prescription. It is possible to dress the quark propagator to all orders with zero-momentum gluons from the perturbative ground state. The dressed quark has no pole and thus cannot appear as an external particle in the S-matrix. Chiral symmetry may be spontaneously broken, but Lorentz and gauge symmetry is exact. Adding loop corrections to this ``dressed tree approximation'' gives a formally exact PQCD expansion. | |
| dc.description | Prepared for the Festschrift in honor of Jan Kwiecinski, to be published in Acta Physica Polonica. 8 pages, 2 figures. Uses appolb.cls | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0304022 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0304022 | |
| dc.identifier | Acta Phys.Polon. B34 (2003) 3121-3128 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/42376 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Filling Perturbative Ground States | |
| dc.type | text |