Single Inclusive π^± and K^± Production in e⁺e⁻ Annihilation at center-of-mass Energies from 2.000 to 3.671GeV

Using data samples with a total integrated luminosity of 253 pb⁻¹ collected by the BESIII detector operating at the BEPCII collider, the differential cross-sections of inclusive π^± and K^± production, as a function of momentum and normalized by the total hadronic cross-section, are measured at center-of-mass energies from 2.000 to 3.671 GeV. The measured π± cross sections are consistent with the previously reported π⁰ cross-sections by BESIII, while the K± cross sections are systematically higher than the K⁰S cross sections by a factor of approximately 1.4. These new results are in agreement with state-of-the-art QCD analyses at next-to-next-to-leading order accuracy, particularly in the large hadron momentum region at energy scales down to 3 GeV. These findings support the validity of isospin symmetry in parton fragmentation processes.