Global QCD Analysis of Pion Parton Distributions with Threshold Resummation.

  title={Global QCD Analysis of Pion Parton Distributions with Threshold Resummation.},
  author={Patrick Barry and C-R. Ji and Nobuo Sato and W. Melnitchouk},
  journal={Physical review letters},
  volume={127 23},
We perform the first global QCD analysis of pion valence, sea quark, and gluon distributions within a Bayesian Monte Carlo framework with threshold resummation on Drell-Yan cross sections at next-to-leading log accuracy. Exploring various treatments of resummation, we find that the large-x asymptotics of the valence quark distribution ∼(1-x)^{β_{v}} can differ significantly, with β_{v} ranging from ≈1 to >2.5 at the input scale. Regardless of the specific implementation, however, the… 

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