Study of correlations between identified charged hadrons in hadronic Z(sup 0) decays

摘要

The authors present a preliminary study of correlations in rapidity between pairs of identified pions, kaons and protons in hadronic Z(sup 0) decays into light flavors. Short range charge correlations are observed between all combinations of these hadron species, confirming that charge, strangeness and baryon number are conserved locally in the jet fragmentation process. The range of this effect is found to be independent of momentum. A strong long-range correlation is observed for high-momentum charged kaon pairs, and weaker long- range (pi)(sup +)-(pi)(sup (minus)), (pi)(sup +)-K(sup (minus)) and p-K(sup (minus)) correlations are observed. The SLC electron beam polarization is used to tag the quark hemisphere in each event, allowing the first study of rapidities signed such that positive rapidity is along the quark rather than antiquark direction. Distributions of signed rapidities and of ordered differences between signed rapidities provide new insights into leading particle production and several new tests of fragmentation models.