The octet structure function and radiative quarkonia decays
Abstract
The operator product expansion, in conjunction with the power counting of nonrelativistic field theory, is used to examine the endpoint region of the radiative decay of heavy quark bound states with ^{3}S_{1} quantum numbers, Q> > γ + X. We identify an infinite class of operators that determine the shape of the photonic endpoint spectrum. These operators can be resummed to form an octet structure function which parameterizes the energy of the dynamical gluon content of the leading octet Fock state component of the quarkonium. This coloroctet contribution is important when the photon spectrum is examined with a resolution given by ΔE_{γ} ~ m_{Q}v^{2}, where v is the magnitude of the relative quark velocity. The formalism used makes explicit the shift of the endpoint from its partonic to its hadronic value.
 Publication:

Physics Letters B
 Pub Date:
 February 1997
 DOI:
 10.1016/S03702693(97)004620
 arXiv:
 arXiv:hepph/9701404
 Bibcode:
 1997PhLB..402..346R
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 9 pages, LaTex, Contribution from ^1S_0 included