Color-singlet NRQCD at next-to-leading order reproduces most LHCb double-J/psi data but undershoots CMS and ATLAS by factors of 10 to 29.
J/psi Pair Production at the Tevatron
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abstract
The double J/psi production in p\bar{p} collision is revisited. It is found that the J/\psi pair 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.
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Next-to-leading-order QCD corrections to double prompt $J/{\psi}$ hadroproduction
Color-singlet NRQCD at next-to-leading order reproduces most LHCb double-J/psi data but undershoots CMS and ATLAS by factors of 10 to 29.