NLO QCD and relativistic corrections are large and negative, substantially reducing the leading-order decay widths for Z → J/ψ + Υ(nS).
The normalization fac- tors Ni = 2 √ 6NcEi arise from the LO LDMEs, and the squared LO LDMEs: |⟨(Qi ¯Qi)3S1|ψ † i σ ·ǫχi|0⟩|2 = 6Nc(2Ei)2
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Next-to-leading order QCD and relativistic corrections to $Z \to J/\psi+\Upsilon(nS)$
NLO QCD and relativistic corrections are large and negative, substantially reducing the leading-order decay widths for Z → J/ψ + Υ(nS).