1999/09/27 by D. Muller, D.R. Muller
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1016/s0920-5632(00)00533-8
published as Nucl.Phys.Proc.Suppl.86:7-16,2000 · 20 pages, 12 figs.; talk given at the QCD99 meeting, Montpellier, France, 7-13 July, 1999; a smaller-print version will appear in the proceedings
arxiv created 1999/09/27 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present selected results on strong interaction physics from the SLD experiment at the SLAC Linear Collider. We report on several new studies of 3- and 4-jet hadronic Z decays, in which jets are identified as quark, antiquark or gluon. The 3-jet Z0->bbg rate is sensitive to the b-quark mass; prospects for measuring mb are discussed. The gluon energy spectrum is measured over the full kinematic range, providing an improved test of QCD and limits on anomalous bbg couplings. The parity violation in Z0->bbg decays is consistent with electroweak theory plus QCD. New tests of T- and CP-conservation at the bbg vertex are performed. A new measurement of the rate of gluon splitting into bb pairs yields g_bb=0.0031+-0.0007(stat.)+-0.0006(syst.) (Preliminary). We also present a number of new results on jet fragmentation into identified hadrons. The B hadron energy spectrum is measured over the full kinematic range using a new, inclusive technique, allowing stringent tests of predictions for its shape and a precise measurement of <xB>=0.714+-0.005(stat.)+-0.007(syst.) (Preliminary). A detailed study of correlations in rapidity y between pairs of identified pions, kaons and protons confirms that strangeness and baryon number are conserved locally, and shows local charge conservation between meson-baryon and strange-nonstrange pairs. Flavor-dependent long-range correlations are observed for all combinations of these hadron species, yielding new information on leading particle production. The first study of correlations using rapidities signed such that y>0 corresponds to the quark direction provides additional new insights into fragmentation, including the first direct observation of baryon number ordering along the qq axis.