Resumming the color-octet contribution to radiative Upsilon decay

Details Resumming the color-octet contribution to radiative Upsilon decay Resumming the color-octet contribution to radiative Upsilon decay

2001-06-28

arxiv.org/abs/hep-ph/0106316v1

Phys.Rev. D64 (2001) 114014

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 Pages 8 figures

Scientific paper

10.1103/PhysRevD.64.114014

At the upper endpoint of the photon energy spectrum in Upsilon -> X gamma, 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 endpoint 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 lightcone structure function, investigate the phenomenological importance of the resummation.

Affiliated with

Also associated with

No associations

Rating

Resumming the color-octet contribution to radiative Upsilon decay does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Resumming the color-octet contribution to radiative Upsilon decay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resumming the color-octet contribution to radiative Upsilon decay will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-331502