A new extraction of pion parton distributions in the statistical model

Abstract

We present a new analysis to extract pion's parton distribution functions (PDFs) in the framework of the statistical model. Starting from the statistical model framework first developed for the spin-1/2 nucleon, we apply appropriate modifications taking into account the spin-0 nature of pion and the isospin and charge-conjugation symmetry properties. This results in a significant reduction of the number of parameters compared to a recent work to extract pion's PDFs. Using π−-induced Drell-Yan data to determine the parameters of this statistical model approach, we show that a good description of these experimental data with Next-to-Leading order QCD calculations can be obtained. Good agreement between the calculations and the π+/π− Drell-Yan cross section ratio data, not included in the global fit, has confirmed the predictive power of these new pion PDFs.

Keywords

• Pion parton distributions
• Statistical approach
• Drell-Yan process