2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48363A nonperturbative proof is given that the chirally-invariant quark propagator contains both particle and hole singularities with different dispersion relations. Mesons made of a quark and a hole will produce dilepton pairs at masses characteristic of the plasma and with a distinct energy dependence.RevTex, 5 pages. Published in proceedings of RHIC Summer Study '96: Theory Workshop on Relativistic Heavy Ion Collisions, Ed. D.E. Kahana and Y. Pang, p. 279High Energy Physics - Phenomenologytext