A complete O(alpha_s^5) NRQCD calculation for prompt J/psi pair hadroproduction finds LHC data fix one combination of color-octet LDMEs, yielding a set that tests heavy-quark spin symmetry via eta_c data.
In single prompt J/ψ production, the feed-down contributions from χcJ andψ(2S) mesons are about 30% and 10%, respectively [51]
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Probing Heavy-Quark Spin Symmetry in Double $J/\psi$ Hadroproduction
A complete O(alpha_s^5) NRQCD calculation for prompt J/psi pair hadroproduction finds LHC data fix one combination of color-octet LDMEs, yielding a set that tests heavy-quark spin symmetry via eta_c data.