INCLUSIVE HADRON PRODUCTION IN THE T-REGION

Inclusive production of 7r ±, K ± and ~ has been measured ine+e- annihilation for center of mass energies between 9.4 and 10.1 GeV. The hadron yields on the resonances T and T ' are compared to the off-resonance (continuum) yields with the aim of uncovering differences between threeogluon hadronization a d quark-antiquark fragmentation. A noticeable difference isseen in the yield of protons and antiprotons which is (8.1-+ 2.1) % of all charged hadrons for T decay and (18.9 ± 6.9) % for T ' decay compared to (1.5 ± 1.1) % for non-resonant production. Single particle inclusive cross sections of charged ha-drons produced by e÷e- annihilations have been meas-ured in a number of experiments [1] over a wide range of the center of mass energy V's. One remarkable observation is the almost perfect scaling in s of the cross section (s/fl) do/dx for x = 2E/x/ ~> ~ 0.2, where /3 is the velocity of the hadron and E its energy. In the quark-parton model approximate scaling is a conse-quence of the assumed quark-gluon structure. It is believed that e÷e- annihilation proceeds via an initial quark-antiquark pair fragmenting into the ob-served hadrons in the continum. In contrast, interme-diate quarkonium states uch as J/ff or T decay predo-minantly into three gluons which again fragment int