J/psi Pair Production at the Tevatron

Abstract

The double J/psi production in p\bar{p} collision is revisited. It is found that the J/ψpair production rate at leading order with p_T > 4 GeV in conventional scheme is larger than the rate derived from color-octet mechanism by a factor of five. As the double J/psi production is shown to be attainable with data yet collected at the Tevatron detectors, experimental study on it would be helpful to clarify the validity of the conventional color-singlet description for heavy quarkonium production.