Based on electron positron collision data collected with the BESIII detector operating at the BEPCII storage rings, the differential cross sections of inclusive ${\pi }^0$ and $K_S^0$ production as a function of hadron momentum, normalized by the total cross section of the $e^{+}{e}^{-}\to \mathrm{hadrons}$ process, are measured at six center-of-mass energies from 2.2324 to 3.6710 GeV. Our results, which cover a relative hadron energy range from 0.1 to 0.9, significantly deviate from several theoretical calculations based on existing fragmentation functions.

• Received 21 November 2022
• Revised 22 March 2023
• Accepted 3 April 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.231901

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Published by the American Physical Society