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The only experimental information on the parton distribution of kaons wasobtained from the scarce kaon-induced Drell-Yan cross section data. From thesedata, evidence for a valence $u$ quark distribution of kaon softer than that ofpion was found. We study the feasibility to extract kaon's valence quarkdistribution via the existing kaon-induced J/psi production data. We comparethe NA3 data on the K- / pi- and K+ / pi+ ratios for J/psi production on aplatinum target with theoretical calculations based on the color-evaporationmodel. We show that the NA3 data on J/psi production provide an independentevidence for a valence $u$ quark distribution softer in kaon than in pion. Thedata also suggest different gluon distributions for kaon and pion.

Valence Quark and Gluon Distributions of Kaon from J/Psi Production