Color-Octet Fraction in J/Psi Production and Absorption

Abstract

The cross section between a $c\bar{c}$ pair and a nucleon is small and sensitive to the $c-\bar{c}$ separation if the pair is in a color-singlet state, but very large and insensitive to the separation if it is in a color-octet state. We use this property in an absorption model involving both color components to deduce the color structure of $c\bar{c}$ pairs produced in $p(B)A\to \psi X$ reactions. Our analysis shows that the NA3, NA38 and E772 data are not inconsistent with the theoretical picture that color-octet and color-singlet precursors are produced in roughly equal proportions if the produced color-singlet precursors are pointlike and transparent. However, if the color-singlet precursors are not transparent but have a cross section of a few mb, these data do show a definite preference for a larger fraction of color-singlet precursors. In either case, the color-octet fraction increases with $x_F$, approaching unity as $x_F$ becomes large.

9 pages, updated to include new results

References in corpus (20)

• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Color-octet quarkonia production
• Color-octet quarkonia production II
• A Quantitative Analysis of Charmonium Suppression in Nuclear Collisions
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Production of Heavy Quarkonium in High Energy Colliders
• Hadro-production of Quarkonia in Fixed Target Experiments
• Charmonium Composition and Nuclear Suppression
• Color-octet mechanism in $\gamma +p\to J/\psi +X$
• Signature for Color-Octet Production of $J/\psi$ in $e^{+}{e}^{-}$ Annihilation
• On the Sum Rule Approach to Quarkonium-Hadron Interactions
• Colour-octet Contributions to J/psi Hadroproduction at Fixed Target Energies
• Color-Octet $J/\psi$ Production at Low $p_{\perp }$
• The Relative $J/\Psi$ to ${\Psi }^{\prime }$ Suppression in Proton-Nucleus and Nucleus-Nucleus Collisions
• Color-Octet ${\psi }^{\prime }$ Production at Low $p_{\perp }$
• Colour-octet Contributions to $x_F$ Distributions in $J/\psi$ Hadro-production at Fixed Target Energies
• Hadronic $\psi$ production calculated in the NRQCD factorization formalism
• Suppression of Psi' and J/Psi in High-Energy Heavy-Ion Collisions
• Suppression of J/psi and Psi' Production in High-Energy Pb on Pb Collisions
• Channel-Coupling Effects in High-Energy Hadron Collisions

Cited by in corpus (5)

• Charmonium suppression in p-A collisions
• Charmonium production from the hadronic phase
• Total Hadron-Hadron Cross Sections at High Energies
• J/psi Production in an Equilibrating Partonic System
• Color mixing in high-energy hadron collisions