A new NRQCD calculation of Z → J/ψ + Υ(nS) decays including NLO QCD and O(v^2) corrections predicts branching fractions of a few times 10^-12, with large negative corrections.
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Next-to-leading order QCD and relativistic corrections to $Z \to J/\psi+\Upsilon(nS)$
A new NRQCD calculation of Z → J/ψ + Υ(nS) decays including NLO QCD and O(v^2) corrections predicts branching fractions of a few times 10^-12, with large negative corrections.