Soft-gluon resummation and the valence parton distribution function of the pion

. 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.

14.40.Be
12.38.Bx
12.38.Cy
pi: form factor
parton: distribution function
resummation: threshold
quantum chromodynamics: perturbation theory
pi- nucleon: inclusive reaction
muon: pair production
leading logarithm approximation: higher-order

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