Abstract
We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process . Compared to previous analyses, we include next-to-leading-logarithmic threshold resummation effects in the calculation of the Drell-Yan cross section. As a result of these, we find a considerably softer valence distribution at high momentum fractions than obtained in previous next-to-leading-order analyses, in line with expectations based on perturbative-QCD counting rules or Dyson-Schwinger equations.
- Received 15 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.252003
© 2010 The American Physical Society