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Next-to-leading-order QCD corrections to the radiative decays $χ_{bJ}\to J/ψ+γ$
Within nonrelativistic QCD (NRQCD) factorization, we calculate the next-to-leading-order (NLO) QCD corrections to $χ_{bJ}\to J/ψ+γ$ with $J=0,1,2$. We determine all six independent helicity amplitudes, including the one-loop corrections to the QED amplitude and the two-loop corrections to the QCD am
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