We present results of an experimental study of e+e-+ hadrons in the kinematic regime for which the process is interpreted as hadron production in collisions of almost-real photons. The data sample corresponds to an integrated luminosity of 27.5 pb- and covers center-of-mass energies from 55 to 61.4 GeV. We observe more events than expected from the incoherent sum of quark-parton and vector-meson-dominance models, and we give a quantitative explanation of the excess by including the hard scattering of the hadronic constituents of the photons calculated with QCD.
Bibliographical noteFunding Information:
We thank the TRISTAN staff for the excellent operation of the storage nng In addition we acknowledge the strong support and enthusiastic assistance provided by the staffs of our home restitutions We thank M Drees and R M Godbole for valuable discussions on multi-jet processes Th~s work has been supported by the Japan Mlmstry of Education, Science and Culture (Monbusho) and Society for the Promotion of Science, the U S Department of Energy and National Soence Foundation, the Korean Science and Engmeenng Foundation and Ministry of Education, and the Academia Slmca of the People's Repubhc of China