Exclusive radiative decays of Υ in soft-collinear effective theory

Sean P Fleming, Christopher Lee, Adam K. Leibovich

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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 <inf>Υ</inf> to the scale A ∼ 1 GeV, thereby summing large logarithms. Finally we use our results to predict the ratio of branching fractions B(Υ→γf<inf>2</inf>)/B(J/ψ→f<inf>2</inf>), B(ψ′→f<inf>2</inf>), 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
Volume71
Issue number7
DOIs
StatePublished - Apr 1 2005
Externally publishedYes

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Collinear
Decay
decay
octets
Coefficient
coefficients
logarithms
Logarithm
Branching
quantum chromodynamics
color
Partial
Predict

ASJC Scopus subject areas

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

Cite this

Exclusive radiative decays of Υ in soft-collinear effective theory. / Fleming, Sean P; Lee, Christopher; Leibovich, Adam K.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 71, No. 7, 074002, 01.04.2005, p. 1-10.

Research output: Contribution to journalArticle

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