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Relativistic corrections to $Υ(1S,2S)\rightarrowγη^{(\prime)}$ in perturbative QCD
We calculate the radiative decays $Υ(1S),Υ(2S)\rightarrowγη^{(\prime)}$ in perturbative quantum chromodynamics through order $q^{2}$ in the relativistic expansion, including the quark-content, two-gluon, and electromagnetic contributions. The quark contribution dominates, with substantial constructi
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