Single Inclusive $\ddot{I}{€}^{\pm }$ and $K^{\pm }$ Production in $e^{+}{e}^{-}$ Annihilation at center-of-mass Energies from 2.000 to 3.671GeV

Abstract

Using data samples with a total integrated luminosity of 253 $\mathrm{p}{\mathrm{b}}^{-1}$ collected by the BESIII detector operating at the BEPCII collider, the differential cross-sections of inclusive $\ddot{I}{€}^{\pm }$ and $K^{\pm }$ 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 $\ddot{I}{€}^{\pm }$ cross sections are consistent with the previously reported $\ddot{I}{€}^0$ 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.