| Autor: |
Ding HT; Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China., Gao X; Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA., Hanlon AD; Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA., Mukherjee S; Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA., Petreczky P; Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA., Shi Q; Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China.; Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA., Syritsyn S; RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.; Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11790, USA., Zhang R; Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA., Zhao Y; Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA. |
| Abstrakt: |
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. |
