Flavor-singlet light-cone amplitudes and radiative Υ decays in the soft-collinear effective theory

Sean Fleming, Adam K. Leibovich

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We study the evolution of flavor-singlet, light-cone amplitudes in the soft-collinear effective theory, and reproduce results previously obtained by a different approach. We apply our calculation to the color-singlet contribution to the photon endpoint in radiative Υ decay. In a previous paper, we studied the color-singlet contributions to the endpoint, but neglected operator mixing, arguing that it should be a numerically small effect. Nevertheless the mixing needs to be included in a consistent calculation, and we do just that in this work We find that the effects of mixing are indeed numerically small. This result combined with previous work on the color-octet contribution and the photon fragmentation contribution provides a consistent theoretical treatment of the photon spectrum in ΥY → γX.

Original languageEnglish (US)
Article number094016
Pages (from-to)094016-1-094016-11
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number9
DOIs
StatePublished - Nov 1 2004
Externally publishedYes

ASJC Scopus subject areas

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

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