Kinematic Effects in Quarkonia Production

Abstract

We investigate energy (momentum) distributions in J/Psi photoproduction and J/Psi production in B meson decay. In particular the upper endpoint region of the spectrum is examined where the effect of soft gluon emission from the ccbar pair becomes important. Constructing a model which is consistent with the so-called shape function formalism we consider these fragmentation effects and show that the relevance of possible colour octet contributions in the photoproduction channel is still inconclusive.

Comments: LaTeX, 7 pages, 3 figures, The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/