### Abstract

At the upper end point of the photon energy spectrum in Y→Xγ, the standard NRQCD power counting breaks down and the OPE gives rise to color-octet structure functions. Furthermore, in this kinematic regime large Sudakov logarithms appear in the octet Wilson coefficients. The end point spectrum can be treated consistently within the framework of a recently developed effective field theory of collinear and soft particles. Here we show that within this approach the octet structure functions arise naturally and that Sudakov logarithms can be summed using the renormalization group equations. We derive an expression for the resummed energy spectrum and, using a model light cone structure function, investigate the phenomenological importance of the resummation.

Original language | English (US) |
---|---|

Article number | 114014 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 64 |

Issue number | 11 |

State | Published - Dec 1 2001 |

Externally published | Yes |

### Fingerprint

### ASJC Scopus subject areas

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

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*64*(11), [114014].

**Resumming the color-octet contribution to radiative Y decay.** / Bauer, Christian W.; Chiang, Cheng Wei; Fleming, Sean P; Leibovich, Adam K.; Low, Ian.

Research output: Contribution to journal › Article

*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 64, no. 11, 114014.

}

TY - JOUR

T1 - Resumming the color-octet contribution to radiative Y decay

AU - Bauer, Christian W.

AU - Chiang, Cheng Wei

AU - Fleming, Sean P

AU - Leibovich, Adam K.

AU - Low, Ian

PY - 2001/12/1

Y1 - 2001/12/1

N2 - At the upper end point of the photon energy spectrum in Y→Xγ, the standard NRQCD power counting breaks down and the OPE gives rise to color-octet structure functions. Furthermore, in this kinematic regime large Sudakov logarithms appear in the octet Wilson coefficients. The end point spectrum can be treated consistently within the framework of a recently developed effective field theory of collinear and soft particles. Here we show that within this approach the octet structure functions arise naturally and that Sudakov logarithms can be summed using the renormalization group equations. We derive an expression for the resummed energy spectrum and, using a model light cone structure function, investigate the phenomenological importance of the resummation.

AB - At the upper end point of the photon energy spectrum in Y→Xγ, the standard NRQCD power counting breaks down and the OPE gives rise to color-octet structure functions. Furthermore, in this kinematic regime large Sudakov logarithms appear in the octet Wilson coefficients. The end point spectrum can be treated consistently within the framework of a recently developed effective field theory of collinear and soft particles. Here we show that within this approach the octet structure functions arise naturally and that Sudakov logarithms can be summed using the renormalization group equations. We derive an expression for the resummed energy spectrum and, using a model light cone structure function, investigate the phenomenological importance of the resummation.

UR - http://www.scopus.com/inward/record.url?scp=0035583382&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035583382&partnerID=8YFLogxK

M3 - Article

VL - 64

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 11

M1 - 114014

ER -