QCD Predictions for Meson Electromagnetic Form Factors at High Momenta: Testing Factorization in Exclusive Processes
arxiv(2024)
摘要
We report the first lattice QCD computation of pion and kaon electromagnetic
form factors, F_M(Q^2), at large momentum transfer up to 10 and 28
GeV^2, respectively. Utilizing physical masses and two fine
lattices, we achieve good agreement with JLab experimental results at Q^2
≲ 4 GeV^2. For Q^2 ≳ 4 GeV^2, our results
provide ab-initio QCD benchmarks for the forthcoming experiments at
JLab 12 GeV and future electron-ion colliders. We also test the QCD collinear
factorization framework utilizing our high-Q^2 form factors at
next-to-next-to-leading order in perturbation theory, which relates the form
factors to the leading Fock-state meson distribution amplitudes. Comparisons
with independent lattice QCD calculations using the same framework demonstrate,
within estimated uncertainties, the universality of these nonperturbative
quantities.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要