====== TTP08-10 Ghost contributions to charmonium production in polarized high-energy collisions. ======
 
 
   <hidden TTP08-10  Ghost contributions to charmonium production in polarized high-energy collisions. > In a previous paper [Phys. Rev. D 68, 034017 (2003)], we investigated the inclus
 ive production of prompt J/psi mesons in polarized hadron-hadron, photon-hadron,
  and photon-photon collisions in the factorization formalism of nonrelativistic
 quantum chromodynamics providing compact analytic results for the double longitu
 dinal-spin asymmetry A_{LL}. For convenience, we adopted a simplified expression
  for the tensor product of the gluon polarization four-vector with its charge co
 njugate, at the expense of allowing for ghost and anti-ghosts to appear as exter
 nal particles. While such ghost contributions cancel in the cross section asymme
 try A_{LL} and thus were not listed in our previous paper, they do contribute to
  the absolute cross sections. For completeness and the reader's convenience, the
 y are provided in this addendum.
 </hidden>
|**M. Klasen, B.A. Kniehl, L. Mihaila, and M. Steinhauser**  | 
|**  Phys.Rev.   D77 117501 2008  **  |
| {{preprints:2008:ttp08-10.pdf|PDF}} {{preprints:2008:ttp08-10.ps|PostScript}} [[http://arxiv.org/abs/0802.3833|arXiv]]   |
| |