Resummation of relativistic corrections to ηc -→ γγ

Hee Sok Chung, Jungil Lee, Chaehyun Yu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


By using the threshold-expansion approach, we compute the relativistic corrections to the two-photon decay width of a spin-singlet S-wave heavy quarkonium. The corrections are resummed to all orders in the heavy-quark velocity v in the quarkonium-rest frame, where we keep all the contributions of the color-singlet QQ̄ potential. Our result agrees with a previous derivation based on the exact spin-projector approach. We also discuss the phenomenological implications of the resummed formula.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalJournal of the Korean Physical Society
Issue number1
Publication statusPublished - 2008 Jan


  • Nonrelativistic QCD
  • Relativistic corrections
  • Threshold expansion

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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