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arxiv: 1009.2481 · v2 · pith:U52W6D7Xnew · submitted 2010-09-13 · ✦ hep-ph

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

Matthias Aicher , Andreas Sch\"afer , Werner Vogelsang This is my paper
classification ✦ hep-ph
keywords distributionvalenceanalysesdrell-yanfunctionpartonpionprevious
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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.

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