Soft-Gluon Resummation and the Valence Parton Distribution Function of the Pion

Abstract

We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process ${\pi }^{-}N\to {\mu }^{+}{\mu }^{-}X$. 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 $x$ than obtained in previous next-to-leading order analyses, in line with expectations based on perturbative-QCD counting rules or Dyson-Schwinger equations.

arXiv comment5 pages, 3 figures, accepted for publication in Physical Review Letters

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