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We present an analysis to extract kaon parton distribution functions (PDFs)for the first time using meson-induced Drell-Yan and quarkonium productiondata. Starting from the statistical model first developed for determining thepartonic structure of spin-1/2 nucleon and later applied to the spin-0 pion, wehave extended this approach to perform a global fit to existing kaon-inducedDrell-Yan and $J/\psi$ production data. These data are well described by thestatistical model, allowing a first extraction of the kaon PDFs. We find thatboth the Drell-Yan and the $J/\psi$ data favor a harder valence distributionfor strange quark than for up quark in kaon. The kaon gluon distribution isfurther constrained by the $J/\psi$ production data. In particular, themomentum fraction carried by gluons is found to be similar for pion and kaon.

Extraction of Kaon Partonic Distribution Functions from Drell-Yan and $J/\psi$ Production Data