Color-Octet $J/\psi$ Production at Low $p_{\perp }$

Abstract

We study contributions from color-octet quarkonium formation mechanisms to $J/\psi$ hadroproduction at low $p_{\perp }$. We include transitions of color-octet $c\bar{c}$ states into ``direct'' $J/\psi$ and into ${\chi }_{1,2}$ which decay radiatively into a $J/\psi$. Together with earlier work, this calculation constitutes a complete analysis of $p_{\perp }$-integrated $J/\psi$ production at leading twist. We find that the leading-twist contribution is not sufficient to reproduce the observed production rates and polarization of the $J/\psi$ and ${\chi }_{1,2}$. Hence there must exist other important quarkonium production mechanisms at low $p_{\perp }$.

REVTEX, 18 pages, 4 figures included

References in corpus (7)

• Color-octet quarkonia production
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Color-octet quarkonia production II
• Quarkonium production in hadronic collisions
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Color-Octet ${\psi }^{\prime }$ Production at Low $p_{\perp }$
• Hadronic $\psi$ production calculated in the NRQCD factorization formalism

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