Abstract
Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt produced from proton-proton collisions at the center-of-momentum energy . We present the transverse-momentum distribution in the forward-rapidity region and the rapidity distribution over the transverse-momentum range . The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of in the forward-rapidity region, while that for the midrapidity region is slightly longitudinal. The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in , but disagrees with the result from the leading-order color-singlet model or the -channel-cut method.
- Received 9 December 2010
DOI:https://doi.org/10.1103/PhysRevD.83.037501
© 2011 American Physical Society