Neutral kaon production in e+e-, ep, and pp-bar collisions at next-to-leading order.

We present new sets of fragmentation functions for neutral kaons, both at leading and next-to-leading order. They are fitted to data on inclusive K0 production in e+e− annihilation taken by MARK II at PEP ( √ s = 29 GeV) and by ALEPH at LEP. Our fragmentation functions lead to a good description of other e+e− data on inclusive K0 production at various energies. They also nicely agree with the K0 S transverse-momentum spectra measured by H1 at the DESY ep collider HERA, by UA5 at the CERN Spp̄S Collider, and by CDF at the Fermilab Tevatron. Permanent address: Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, Föhringer Ring 6, 80805 Munich, Germany. Supported by Bundesministerium für Forschung und Technologie, Bonn, Germany, under Contract 05 6 HH 93P (5), and by EEC Program Human Capital and Mobility through Network Physics at High Energy Colliders under Contract CHRX-CT93-0357 (DG12 COMA).