On the possibility of measuring the strange-valence-quark distribution of the kaon and the strange-sea distribution of the proton in Drell-Yan processes

We show that the combined investigations of inclusive and semi-inclusive (registering the accompanying tagged pion) of Drell-Yan lepton-pair production processes in K+p and K-p interactions makes it possible to measure the valence part of the kaon structure functions, the strange-sea distribution in the proton, and also the fragmentation function into pions of multiparton states formed in the kaon fragmentation region as a result of the annihilation of a valence quark (strange or nonstrange). In the framework of the recombination model of hadron production we predict differential cross sections of semi-inclusive Drell-Yan processes