Van Hove Singularities in the Quark-Gluon Plasma

Abstract

General arguments as well as different approximations for the in-medium quark propagator in a quark-gluon plasma lead to quark dispersion relations that exhibit a minimum in one branch (plasmino). This minimum causes Van Hove singularities in the dilepton production rate and mesonic correlators, which might have observable consequences.

Comments: 9 pages, LaTex, 5 PostScript figures and style file included, to be published in the proceedings of the conference "New Frontiers in Soft Physics and Correlations on the Threshold of the Third Millenium" (12-17 June 2000, Torino, Italy)