Hadron Fragmentation Functions and Leading Particle Effects in Hadronic Z Decays: New Results from Sld

We have measured the differential cross sections for the production of π, K, K, K(892), φ(1020), p and Λ in hadronic Z decays and in subsets of flavor-tagged Z → light quark (uū, dd̄, or ss̄) , Z → cc̄ and Z → bb̄ events. Charged hadrons were identified with the SLD Cherenkov ring imaging detector. The vertex detector was employed to select flavor enriched samples and the polarized electron beam from SLC was used to tag quark and anti-quark jets. We observe a flavor dependence in the hadron fragmentation functions. We present evidence for leading particle production in hadronic decays of the Z boson to light-flavor jets and a direct measurement of the strangeness suppression factor γs. Invited talk presented at the 32nd Rencontres de Moriond: QCD and High-Energy Hadronic Interactions Les Arcs, France 22-29 Mar 1997 ∗Work supported by Department of Energy contract DE–AC03–76SF00515. HADRON FRAGMENTATION FUNCTIONS AND LEADING PARTICLE EFFECTS IN HADRONIC Z DECAYS: NEW RESULTS FROM SLD Jochen Schwiening Stanford Linear Accelerator Center Stanford University, Stanford, CA 94309 Representing The SLD Collaboration Abstract We have measured the differential cross sections for the production of π, K, K, K(892), φ(1020), p and Λ in hadronic Z decays and in subsets of flavor-tagged Z → light quark (uū, dd̄, or ss̄) , Z → cc̄ and Z → bb̄ events. Charged hadrons were identified with the SLD Cherenkov ring imaging detector. The vertex detector was employed to select flavor enriched samples and the polarized electron beam from SLC was used to tag quark and anti-quark jets. We observe a flavor dependence in the hadron fragmentation functions. We present evidence for leading particle production in hadronic decays of the Z boson to light-flavor jets and a direct measurement of the strangeness suppression factor γs.We have measured the differential cross sections for the production of π, K, K, K(892), φ(1020), p and Λ in hadronic Z decays and in subsets of flavor-tagged Z → light quark (uū, dd̄, or ss̄) , Z → cc̄ and Z → bb̄ events. Charged hadrons were identified with the SLD Cherenkov ring imaging detector. The vertex detector was employed to select flavor enriched samples and the polarized electron beam from SLC was used to tag quark and anti-quark jets. We observe a flavor dependence in the hadron fragmentation functions. We present evidence for leading particle production in hadronic decays of the Z boson to light-flavor jets and a direct measurement of the strangeness suppression factor γs.