Speaker
Description
We present an analysis to extract pion and kaon parton distribution functions (PDFs) using meson-induced Drell-Yan and charmonium production data. Starting from the statistical model first developed for determining the partonic structure of spin-1/2 nucleon and later applied to the spin-0 mesons, we have extended this approach to perform
a global fit to existing pion- and kaon-induced Drell-Yan and 𝐽∕𝜓 production data. These data are well described by the statistical model, allowing an extraction of the pion and kaon PDFs. We find that both the Drell-Yan and the 𝐽∕𝜓 data favor a harder valence distribution for strange quark than for up quark in kaon. The pion and kaon gluon distributions are further constrained by the 𝐽∕𝜓 production data. In particular, the momentum fraction carried by gluons is found to be similar for pion and kaon.
This work is based on collaboration with Claude Bourrely, Franco Buccella, and Wen-Chen Chang.
