Single Inclusive ^ 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 ^ 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 ^ cross sections are consistent with the previously reported ^0 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.