The photon spectrum in Y decays

Sean P Fleming, Adam K. Leibovich

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We present a theoretical prediction for the photon spectrum in radiative Y decay. Parts of the spectrum have already been understood, but an understanding of the end point region has remained elusive. In this paper we provide the missing piece, and resolve a controversy in the literature. We treat the end point region of Y →Xγ decay within the framework of the soft-collinear effective theory (SCET). Within this approach the Y structure function arises naturally, and kinematic logarithms are summed by running operators using renormalization group equations. In a previous paper we studied the color-octet contribution to the decay. Here we treat the color-singlet contribution. We combine our result with previous results to obtain the Y→Xγ spectrum. We find that resumming the color-singlet contribution in the end point gives a result that is in much better aoreement with the data than the leading order prediction.

Original languageEnglish (US)
Article number074035
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume67
Issue number7
DOIs
StatePublished - 2003
Externally publishedYes

Fingerprint

End point
Photon
Decay
color
photons
decay
Prediction
octets
Collinear
Structure-function
predictions
logarithms
Logarithm
Renormalization Group
Kinematics
Resolve
kinematics
operators
Operator
Color

ASJC Scopus subject areas

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

Cite this

The photon spectrum in Y decays. / Fleming, Sean P; Leibovich, Adam K.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 67, No. 7, 074035, 2003.

Research output: Contribution to journalArticle

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