2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 8, 273-281
DOI 10.1007/s100529900948

Testing factorization of charmonium production

G.A. Schuler

Theory Division, CERN, CH-1211 Geneva 23, Switzerland (e-mail: Gerhard.Schuler@cern.ch)

Received: 27 April 1998 / Published online: 22 March 1999

Abstract
Within the NRQCD factorization approach the production of heavy quarkonia can be calculated in perturbative QCD in terms of a few production-process-independent NRQCD matrix elements. We test the universality of these long-distance matrix elements by comparing their values as determined from charmonium production at $\rm p\bar{p}$, $\rm ep$, and $\rm e^+e^-$ colliders, and in $\rm Z^0$, $\Upsilon$, and $\rm B$ decays.


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