Color-Octet Fragmentation and the psi' Surplus at the Tevatron

Abstract

The production rate of prompt ${\psi }^{\prime }$'s at large transverse momentum at the Tevatron is larger than theoretical expectations by about a factor of 30. As a solution to this puzzle, we suggest that the dominant ${\psi }^{\prime }$ production mechanism is the fragmentation of a gluon into a $c\bar{c}$ pair in a pointlike color-octet S-wave state, which subsequently evolves nonperturbatively into a ${\psi }^{\prime }$ plus light hadrons. The contribution to the fragmentation function from this process is enhanced by a short-distance factor of $1/{\alpha }_s^2$ relative to the conventional color-singlet contribution. This may compensate for the suppression by $v^4$, where $v$ is the relative momentum of the charm quark in the ${\psi }^{\prime }$. If this is indeed the dominant production mechanism at large $p_T$, then the prompt ${\psi }^{\prime }$'s that are observed at the Tevatron should almost always be associated with a jet of light hadrons.

9 pages, LaTex

References in corpus (5)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Fragmentation production of J/psi and psi' at the Tevatron
• J/psi Production via Fragmentation at the Tevatron
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