QCD Predictions for Meson Electromagnetic Form Factors at High Momenta: Testing Factorization in Exclusive Processes

Autor:	Ding, Heng-Tong, Gao, Xiang, Hanlon, Andrew D., Mukherjee, Swagato, Petreczky, Peter, Shi, Qi, Syritsyn, Sergey, Zhang, Rui, Zhao, Yong
Rok vydání:	2024
Předmět:	High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory
Druh dokumentu:	Working Paper
Popis:	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 $\mathrm{GeV}^2$, respectively. Utilizing physical masses and two fine lattices, we achieve good agreement with JLab experimental results at $Q^2 \lesssim 4~\mathrm{GeV}^2$. For $Q^2 \gtrsim 4~\mathrm{GeV}^2$, our results provide $\textit{ab-initio}$ 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. Comment: 25 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2404.04412 Zobrazit plný text záznamu View this record from Arxiv