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Results on strange particles produced by high energy protons on nuclear targets are reviewed. Topics included are inclusive cross- sections, A-dependence, particle ratios and production polarization of hyperons. 49 refs., 41 figs., 1 tab.
Antiproton production in heavy ion collisions reflects subtle interplay between initial production and absorption by nucleons. Because the AGS energies (10--20 A·GeV/c) are close to the antiproton production threshold, antiproton may be sensitive to cooperative processes such as QGP and hadronic multi-step processes. On the other hand, antiproton has been proposed as a probe of baryon density due to large N{anti N} annihilation cross sections. Cascade models predict the maximum baryon density reaches about 10 times the normal nucleus density in central Au+Au collisions, where the strong antiproton absorption is expected. In this paper, the authors show systematic studies of antiproton production from p+A to Au+Au collisions.
BNL E910 has measured strange baryon production as a function of collision centrality for 17.5 GeV/c p-Au collisions. Collision centrality is defined by v1 the mean number projectile-nucleon interactions estimated from the ''grey'' track multiplicity. The measured [Lambda] yield increases faster than the participant scaling expectation for v ≤ 3 and then saturates. A simple parameterization of this dependence applied to nucleus-nucleus collisions reproduces the measured E866 km. and WA97 [Lambda] centrality dependent yields. The increase in [Lambda] production to v ≤ 3 is also evident for [Lambda]s which are leading baryons, in disagreement with predictions from RQMD.