Comparison of kaon and pion valence quark distributions in a statistical model

We have calculated the Bjorken-$x$ dependence of the kaon and pion valence quark distributions in a statistical model. Each meson is described by a Fock state expansion in terms of quarks, antiquarks and gluons. Although the pion valence quark distributions have been determined by Drell-Yan experiments, the kaon valence quark distributions have only been deduced from the measurement of the ratio $\bar{u}_K(x)/\bar{u}_\pi(x)$ by Badier et al. [1]. We show that, using no free parameters, our model is in good agreement with the decrease of this ratio with increasing $x$. \\[4pt] [1] J. Badier et al., Phys. Lett. B 93 (1980) 354.