Exclusive radiative decays of Υ in soft-collinear effective theory

Sean Fleming, Christopher Lee, Adam K. Leibovich

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We study exclusive radiative decays of the Υ using soft-collinear effective theory and nonrelativistic QCD. In contrast to inclusive radiative decays at the endpoint we find that color-octet contributions are power suppressed in exclusive decays, and can safely be neglected, greatly simplifying the analysis. We determine the complete set of Lorentz structures that can appear in the SCET Wilson coefficients and match onto them using results from a previous calculation. We run these coefficients from the scale M Υ to the scale A ∼ 1 GeV, thereby summing large logarithms. Finally we use our results to predict the ratio of branching fractions B(Υ→γf2)/B(J/ψ→f2), B(ψ′→f2), and the partial rate for Υ→γππ.

Original languageEnglish (US)
Article number074002
Pages (from-to)1-10
Number of pages10
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Apr 1 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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