Lattice QCD predictions of pion and kaon electromagnetic form factors at large momentum transfer

We present a first Lattice Quantum Chromodynamics (QCD) prediction for the electromagnetic form factors (EMFFs) of the pion and kaon up to very large momentum transfers, i.e., Q² ∼ 10 and 28 GeV², respectively.Our calculations utilize Wilson-clover fermions within the N_f = 2 + 1 Highly Improved Staggered Quark (HISQ) ensemble at the physical point.For pion, we employ a lattice spacing of a = 0.076 fm, and for kaon, we use two spacings, a = 0.04 and 0.076 fm, to mitigate discretization effects.The renormalized results indicate a rapid increase in Q²F(Q²) at lower Q² values, which then stabilize for both pion and kaon.Notably, our findings align well with existing experimental data, establishing a reliable QCD benchmark for future experimental analyses from JLab12, EicC, and EIC.