Color-octet mechanism in γ+p→J/ψ+X

Pyungwon Ko, Jungil Lee, H. S. Song

Research output: Contribution to journalArticle

137 Citations (Scopus)

Abstract

Photoproduction of J/ψ is considered including the color-octet contributions from the various partial wave states, 2s-1LJ=1S0, 3S1, and 3PJ. The production cross section depends on three new nonperturbative parameters defined in NRQCD, called the color-octet matrix elements. Using the color-octet matrix elements determined by fitting the J/ψ production at the Fermilab Tevatron, we find that the color-octet (cc̄)8(1S0and3PJ) contributions to the J/ψ photoproduction at the fixed target experiments and at DESY HERA are too large compared to the data on σ(γ+p→Jlψ+X) in the forward direction, and the z distribution of J/ψ. The PT 2 distribution of Jlψ and the total inelastic Jlψ production rate as a function of √syp are predicted including color-octet contributions. We also briefly digress on the B→J/ψ+X and observe the similar situation. This may be an indication that the color-octet matrix elements determined from the J/ψ production at the Tevatron, especially 〈0|script O sign8 ψ(1S0)|0〉 and 〈0|script O sign8 ψ(3PJ)|0〉, might have been overestimated by an order of magnitude.

Original languageEnglish
Pages (from-to)4312-4325
Number of pages14
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume54
Issue number7
Publication statusPublished - 1996 Oct 1
Externally publishedYes

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octets
color
photoproduction
matrices
Color
indication
Cross section
Partial
Target
cross sections
Experiment

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Color-octet mechanism in γ+p→J/ψ+X. / Ko, Pyungwon; Lee, Jungil; Song, H. S.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 54, No. 7, 01.10.1996, p. 4312-4325.

Research output: Contribution to journalArticle

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