Resumming relativistic corrections to Γ[J/φ → e +e-]

Hee Sok Chung, Jungil Lee, Chaehyun Yu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We calculate the relativistic corrections to the color-singlet contributions to the leptonic decay width of the spin-triplet S-wave heavy quarkonium resummed to all orders in v. The formula is obtained by using the threshold-expansion method and is consistent with that based on the exact spin-projection operator. The color-singlet nonrelativistic quantum chromodynamics (NRQCD) matrix elements for the J/ψ and ψ(2S) mesons are determined by comparing the resummed formula with the measured leptonic decay widths of the two charmonia. A significant enhancement of the numerical values for the NRQCD matrix elements may result in a large increase in the theoretical predictions for the color-singlet contributions to the S-wave charmonium production cross-sections.

Original languageEnglish
Pages (from-to)L357-L360
JournalJournal of the Korean Physical Society
Volume50
Issue number2
Publication statusPublished - 2007 Feb

Keywords

  • NRQCD
  • Relativistic corrections
  • Resummation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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