TY - JOUR
T1 - Flavor-singlet light-cone amplitudes and radiative Υ decays in the soft-collinear effective theory
AU - Fleming, Sean
AU - Leibovich, Adam K.
N1 - Funding Information:
This work was supported in part by the Department of Energy under Grant No. DOE-ER-40682-143 and in part by the National Science Foundation under Grant No. PHY-0244599.
PY - 2004/11
Y1 - 2004/11
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.70.094016
DO - 10.1103/PhysRevD.70.094016
M3 - Article
AN - SCOPUS:33845731774
SN - 0556-2821
VL - 70
SP - 094016-1-094016-11
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 9
M1 - 094016
ER -