مثل قطرة الدهن في الحليب: لماذا تسيطر الجسيمات "الثقيلة" على الميزونات سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2605.17389

In this work, we investigate the constituent parton distribution functions (PDFs) of the kaon and heavy pseudoscalar mesons within the light-cone quark model. Starting from the initial scale quark and antiquark PDFs, obtained by evaluating the quark-quark correlation functions for individual mesons, we perform quantum chromodynamics (QCD) evolution to determine the partonic structure at higher energy scales. The QCD evolution has been carried out through the next-to-leading order (NLO) Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. We further compute the average longitudinal momentum fractions carried by the individual constituents both at the model scale and evolved scale. In addition, the NLO structure functions for the kaon are predicted at higher energy scales relevant for the upcoming Electron-Ion Collider (EIC). For the COMPASS++/AMBER experiment, we further present detailed predictions for the NLO Drell-Yan cross sections corresponding to both isospin states of the kaon, employing Carbon, Tungsten, and Aluminum as nuclear targets. We demonstrate the dominance of the heavy constituents over the lighter constituents within their heavy mesons in terms of their possessed momentum fractions.