I briefly review the nonrelativistic QCD picture of quarkonium production and
its confrontation with experiment in various production processes.Comment: 17 pages, LaTeX, 1 figure, sprocl.sty provided (To appear in the
  Proceedings of the Second Workshop on Continuous Advances in QCD,
  Minneapolis, U.S.A., March 1996

Beneke, M.

English

arXiv

Quarkonium spectroscopy, decay and production has provided scientists with an interesting place to test their ideas on QCD ever since charmonium was discovered in 1974. Yet, the potential of perturbative QCD (PQCD) to treat production and decay has been fully exploited only recently in a development comparable to that of Heavy Quark Effective Theory for heavy-light mesons. About the same time, experiments measuring quarkonium production at large transverse momentum have confronted theorists with surprisingly large cross sections. These observations have led to the understanding that fragmentation and hadronization of color-octet quark-antiquark (Q{anti Q}) pairs are essential in the production process. Color-octet mechanisms were considered in quarkonium decays already a while ago. They were found to solve the problem of infrared divergences in P-wave decays in a systematic way. Taking them into account also in S-wave production, where they are not required by perturbative consistency in leading order of a nonrelativistic expansion, opens the promise of a quantitative description of quarkonium production. The author briefly reviews the nonrelativistic QCD picture of quarkonium production and its confrontation with experiment in various production processes

Signatures of Color-Octet Quarkonium Production

Abstract

Similar works

Full text

Available Versions

UNT (University of North Texas) Digital Library