Fragmentation of charm to charmonium in $e^{+}{e}^{-}$ and $pp$ collisions

Abstract

We perform numerical comparison of the fragmentation mechanism of charmonium production ($gg\to c\bar{c}$ followed by $c\to \psi c$) with the full leading order calculation ($gg\to \psi c\bar{c}$ at $Ø({\alpha }_s^4)$). We conclude that the non-fragmentation contributions remain important up to $J/\psi$ transverse momenta about as large as 50 GeV, thus making questionable the applicability of the fragmentation approximation at smaller transverse momenta.

arXiv comment6 pages, 7 figures

References in corpus (8)

• Parton distributions for the LHC
• Z^0 Decay into Charmonium via Charm Quark Fragmentation
• The CCFM Monte Carlo generator CASCADE 2.2.0
• Photoproduction of Charmonia and Total Charmonium-Proton Cross Sections
• Fragmentation contributions to hadroproduction of prompt $J/\psi$, ${\chi }_{cJ}$, and $\psi (2S)$ states
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• Jet lag effect and leading hadron production