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

S. P. Baranov; B. Z. Kopeliovich

doi:10.1140/epjc/s10052-019-6700-0

paper

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

arXiv:1803.01060 · doi:10.1140/epjc/s10052-019-6700-0

Abstract

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

6 pages, 7 figures

Fragmentation of charm to charmonium in e+e− and pp collisions

Abstract

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