Color-Octet $J/ψ$ Production at Low $p_\perp$

Details Color-Octet $J/ψ$ Production at Low $p_\perp$ Color-Octet $J/ψ$ Production at Low $p_\perp$

1996-03-11

arxiv.org/abs/hep-ph/9603266v1

Phys.Rev. D54 (1996) 4349-4355

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTEX, 18 pages, 4 figures included

Scientific paper

10.1103/PhysRevD.54.4349

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 $p_\perp$.

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