Evolution Effects in Z^0 Fragmentation into Charmonium

Details Evolution Effects in Z^0 Fragmentation into Charmonium Evolution Effects in Z^0 Fragmentation into Charmonium

1996-12-19

arxiv.org/abs/hep-ph/9612408v1

Z.Phys. C76 (1997) 515-521

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

In Z^0 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.

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