ψ′ polarization as a test of colour octet quarkonium production

M. Beneke, I. Z. Rothstein

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

We calculate the αs corrections to the transverse polarization fraction of ψ′'s produced at the Tevatron. If the 'ψ′-anomaly' is explained by gluon fragmentation into a colour octet Fock component of the ψ′, the ψ′'s should be 100% transversely polarized at leading order in αs, up to spin symmetry breaking long-distance corrections. We find that the short-distance correction (due to gluon fragmentation) to the transverse polarization fraction is a few percent. A polarization measurement would thus provide a reliable test of the colour octet mechanism, particularly at large pT, where a potential loss of polarization due to non-fragmentation processes is avoided.

Original languageEnglish
Pages (from-to)157-164
Number of pages8
JournalPhysics Letters B
Volume372
Issue number1-2
DOIs
StatePublished - 4 Apr 1996
Externally publishedYes

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