$O(\alpha_s v^2)$ correction to pseudoscalar quarkonium decay to two photons

Yu Jia; Xiu-Ting Yang; Wen-Long Sang; Jia Xu

doi:10.1007/JHEP06(2011)097

$O(\alpha_s v^2)$ correction to pseudoscalar quarkonium decay to two photons

High Energy Physics - Phenomenology 2015-05-27 v2 High Energy Physics - Experiment

Authors: Yu Jia , Xiu-Ting Yang , Wen-Long Sang , Jia Xu

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Abstract

We investigate the $O(\alpha_s v^2)$ 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 ${O(\alpha_s)$ QCD amplitude are thoroughly addressed.

Keywords

pseudoscalar quarkonium two-photon decay NRQCD factorization O(alpha_s v^2) correction short-distance coefficient perturbative matching

Cite

@article{arxiv.1104.1418,
  title  = {$O(\alpha_s v^2)$ correction to pseudoscalar quarkonium decay to two photons},
  author = {Yu Jia and Xiu-Ting Yang and Wen-Long Sang and Jia Xu},
  journal= {arXiv preprint arXiv:1104.1418},
  year   = {2015}
}

Comments

v2, 28 pages, 2 figures and 2 tables, matching the published version; typos corrected, references added, as well as a "Note added in the proof"

$O(\alpha_s v^2)$ correction to pseudoscalar quarkonium decay to two photons

Abstract

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