Single Inclusive $ {\pi }^{\pm }$ and $ {K}^{\pm }$ Production in $ {e}^{+}{e}^{-}$ Annihilation at Center-of-Mass Energies from 2.000 to 3.671 GeV

Using data samples with a total integrated luminosity of $ 253\text{}\text{}{\mathrm{pb}}^{-1}$ collected by the BESIII detector operating at the BEPCII collider, the differential cross sections of inclusive $ {\pi }^{\pm }$ and $ {K}^{\pm }$ production, as a function of the 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 $ {\pi }^{\pm }$ cross sections are consistent with the previously reported $ {\pi }^{0}$ cross sections by BESIII, while the $ {K}^{\pm }$ cross sections are systematically higher than the $ {K}_{S}^{0}$ 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.