Abstract
In Z0 decay into prompt charmonium, i.e. 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 colouroctet result is diminished by 15%. We compare the Monte Carlo calculations with results obtained by using analytical evolution equations.
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Ernström, P., Lönnblad, L. & Vänttinen, M. Evolution effects in Z0 fragmentation into Charmonium. Z Phys C - Particles and Fields 76, 515–521 (1997). https://doi.org/10.1007/s002880050574
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DOI: https://doi.org/10.1007/s002880050574