1996/12/19 by P. Ernstrom, L. Lonnblad, M. Vanttinen · 1 citation
Physics and Astronomy · #hep-ph
published as Z.Phys. C76 (1997) 515-521
arxiv created 1996/12/19 · arxiv updated 2009/11/30
In Z0 decay into prompt charmonium, ie. charmonium not originating from B-meson decays, the most important contribution is expected to come from colour-octet mechanisms. However, previous fixed-order calculations of the colour-octet contribution contain large logarithms which, in a more complete treatment, should be resummed to all orders. We study this resummation by using a Monte Carlo QCD cascade model and find that the fixed-order colour-octet result is diminished by 15%. We compare the Monte Carlo calculations with results obtained by using analytical evolution equations.