Zusammenfassung
We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process pi N- -> 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 ...
Zusammenfassung
We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process pi N- -> 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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