Resummation of relativistic corrections to e+e-→J/ψ+ηc

Geoffrey T. Bodwin, Jungil Lee, Chaehyun Yu

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

We present a new calculation, in the nonrelativistic QCD (NRQCD) factorization formalism, of the relativistic corrections to the double-charmonium cross section σ[e+e-→J/ψ+ηc] at the energy of the Belle and BABAR experiments. In comparison with previous work, our calculation contains several refinements. These include the use of the improved results for the nonperturbative NRQCD matrix elements, the resummation of a class of relativistic corrections, the use of the vector-meson-dominance method to calculate the fragmentation contribution to the pure QED amplitude, the inclusion of the effects of the running of α, and the inclusion of the contribution that arises from the interference between the relativistic corrections and the corrections of next-to-leading order in αs. We also present a detailed estimate of the theoretical uncertainty. We conclude that the discrepancy between the theoretical prediction for σ[e+e-→J/ ψ+ηc] and the experimental measurements has been resolved.

Original languageEnglish
Article number094018
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number9
DOIs
Publication statusPublished - 2008 May 22

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

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