Abstract
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 α s through the perturbative matching procedure. Some technical subtleties encountered in calculating the \( \mathcal{O}\left( {{\alpha_s}} \right) \) QCD amplitude are thoroughly
addressed.
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ArXiv ePrint: 1104.1418
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Jia, Y., Yang, XT., Sang, WL. et al. \( \mathcal{O}\left( {{\alpha_s}{v^2}} \right) \) correction to pseudoscalar quarkonium decay to two photons. J. High Energ. Phys. 2011, 97 (2011). https://doi.org/10.1007/JHEP06(2011)097
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DOI: https://doi.org/10.1007/JHEP06(2011)097