UV renormalons in QCD and their phenomenological implications

Abstract

I report on some recent work done in collaboration with E. de Rafael on the connection between ultraviolet renormalons in QCD and Nambu-Jona-Lasinio-like Lagrangians as its effective description at low energies.

Comments: 6 pages, LateX, espcrc2; contribution to QCD97, Montpellier, France, July 1997, to appear in the proceedings