Abstract
We present a theoretical prediction for the photon spectrum in radiative [Formula Presented] 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 [Formula Presented] decay within the framework of the soft-collinear effective theory (SCET). Within this approach the [Formula Presented] 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 [Formula Presented] spectrum. We find that resumming the color-singlet contribution in the end point gives a result that is in much better agreement with the data than the leading order prediction.
| Original language | English (US) |
|---|---|
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 67 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jan 1 2003 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
Cite this
The photon spectrum in [Formula Presented] decays. / Fleming, Sean P; Leibovich, Adam K.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 67, No. 7, 01.01.2003.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The photon spectrum in [Formula Presented] decays
AU - Fleming, Sean P
AU - Leibovich, Adam K.
PY - 2003/1/1
Y1 - 2003/1/1
N2 - We present a theoretical prediction for the photon spectrum in radiative [Formula Presented] 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 [Formula Presented] decay within the framework of the soft-collinear effective theory (SCET). Within this approach the [Formula Presented] 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 [Formula Presented] spectrum. We find that resumming the color-singlet contribution in the end point gives a result that is in much better agreement with the data than the leading order prediction.
AB - We present a theoretical prediction for the photon spectrum in radiative [Formula Presented] 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 [Formula Presented] decay within the framework of the soft-collinear effective theory (SCET). Within this approach the [Formula Presented] 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 [Formula Presented] spectrum. We find that resumming the color-singlet contribution in the end point gives a result that is in much better agreement with the data than the leading order prediction.
UR - http://www.scopus.com/inward/record.url?scp=85038991098&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85038991098&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.67.074035
DO - 10.1103/PhysRevD.67.074035
M3 - Article
AN - SCOPUS:85038991098
VL - 67
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 7
ER -