Pion and kaon valence-quark parton distribution functions
  A rainbow-ladder truncation of QCD's Dyson-Schwinger equations, constrained by existing applications to hadron physics, is employed to compute the valence-quark parton distribution functions of the pion and kaon. Comparison is made to pi-N Drell-Yan data for the pion's u-quark distribution and to Drell-Yan data for the ratio u_K(x)/u_\pi(x): the environmental influence of this quantity is a parameter-free prediction, which agrees well with existing data. Our analysis unifies the computation of distribution functions with that of numerous other properties of pseudoscalar mesons. 
Trang Nguyen, Adnan Bashir, Craig D. Roberts, and Peter C. Tandy
nucl-th hep-ex hep-lat hep-ph nucl-ex