\( \mathcal{O}\left( {{\alpha_s}{v^2}} \right) \) correction to pseudoscalar quarkonium decay to two photons. (English) Zbl 1298.81393
Summary: We investigate the \( \mathcal{O}\left( {{\alpha_s}{v^2}} \right) \) correction to the process of pseudoscalar quarkonium decay to two photons in nonrelativistic QCD (NRQCD) factorization framework. The short-distance coefficient associated with the relative-order \(v^{2}\) NRQCD matrix element is determined to next-to-leading order in \(\alpha_{s}\) through the perturbative matching procedure. Some technical subtleties encountered in calculating the \( \mathcal{O}\left( {{\alpha_s}} \right) \) QCD amplitude are thoroughly{
}addressed.
MSC:
| 81V05 | Strong interaction, including quantum chromodynamics |
| 81U99 | Quantum scattering theory |
| 81T15 | Perturbative methods of renormalization applied to problems in quantum field theory |
Keywords:
QCD phenomenologyReferences:
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