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We obtain the pion and the kaon parton distribution functions from theeigenstates of a light front effective Hamiltonian in the constituentquark-antiquark representation suitable for low-momentum scale applications. Bytaking these scales as the only free parameters, the valence quark distributionfunctions of the pion, after QCD evolution, are consistent with the data fromthe FNAL-E615 experiment. The ratio of the up quark distribution of the kaon tothat of the pion also agrees with the CERN-NA3 experiment. Supplemented byknown parton distribution functions for the nucleons, we further obtain thecross section consistent with experimental data for the${\pi^-\rm{nucleus}}\rightarrow{\mu^+\mu^-X}$ Drell-Yan process.

Parton Distribution Functions from a Light Front Hamiltonian and QCD Evolution for Light Mesons