STUDY OF INCLUSIVE BARYON-ANTIBARYON PAIR PRODUCTION OF RHO OR LAMBDAIN 2-PHOTON PROCESSES

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e(+)e(-) collider TRISTAN, and corr espond to an integrated luminosity of 303 pb(-1). Correlations between a baryon and an antibaryon were studied for their flavors (p or Lambd a) and their momentum vectors. The experimental results were compared with the expectations from a jet-fragmentation Monte Carlo simulation. We have found that although the ratios of the cross sections of diffe rent baryon-flavor combinations are consistent with the Monte Carlo ex pectations, the cross section shows an excess over the Monte Carlo exp ectation in a low invariant-mass region of final-state particles at la rge angles, that indicates a significant contribution from higher-orde r QCD or non-perturbative effects. The experimental data show no narro w azimuthal-angle correlation, which is expected from a jet-fragmentat ion Monte Carlo. A search for exclusive Lambda pair production has als o been made. We have no candidates and have obtained the upper limit f or the cross section.