Color-octet fragmentation and the ψ′ sssssurplus at the fermilab tevatron

Eric Braaten, Sean Fleming

Research output: Contribution to journalArticlepeer-review

453 Scopus citations


The production rate of prompt ψ′'s at large transverse momentum at the Fermilab Tevatron is larger than theoretical expectations by about a factor of 30. As a solution to this puzzle, we suggest that the dominant ψ′ production mechanism is the fragmentation of a gluon into a cc̄ pair in a pointlike color-octet S-wave state, which subsequently evolves nonperturbatively into a ψ′ plus light hadrons. This contribution to the fragmentation function is enhanced by a short-distance factor of 1/αs2, which may compensate for its suppression by v4, where v is the relative momentum of the charm quark in the ψ′.

Original languageEnglish (US)
Pages (from-to)3327-3330
Number of pages4
JournalPhysical review letters
Issue number17
StatePublished - 1995

ASJC Scopus subject areas

  • General Physics and Astronomy


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