Polarized J/ψ production at CLEO

Seungwon Baek, Jungil Lee, H. S. Song, P. Ko

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Abstract

Polarizations of the prompt -J/ψ's produced in the e +e - annihilation at CLEO energy (√s = 10.58 GeV) are considered in the framework of the nonrelativistic quantum chromodynamics (NRQCD) factorization formalism. We find that the J/ψ polarization has a strong dependence on the production mechanism. At CLEO energy, the most dominant J/ψ production mechanism throughout most of phase space is the color-singlet mechanism, e +e - → J/ψ + gg, for which J/ψ's are highly longitudinally polarized. On the other hand, the dominant J/ψ production mechanism at the upper endpoint of the J/ψ energy distribution is the color-octet process, e +e - → (cc̄) (8) + g, for which J/ψ's are almost unpolarized. Thus, the measurement of the polarization of the endpoint J/ψ's is another test of the color-octet mechanism and a constraint on the NRQCD matrix elements.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalJournal of the Korean Physical Society
Volume33
Issue number1
Publication statusPublished - 1998 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Baek, S., Lee, J., Song, H. S., & Ko, P. (1998). Polarized J/ψ production at CLEO. Journal of the Korean Physical Society, 33(1), 97-101.