NNLO Prediction: C. Anastasiou et al., Phys. Rev.
D69
, 094008 (2004)
MRST 2006 PDFs: A. D. Martin et al., hep-ph/0706.0459, Eur. Phys. J.,
C28
, 455 (2003)
CTEQ6M PDFs: J. Pumplin et al., hep-ph/0201195
