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The energy-energy correlations in charged tracks from the hadronic decays of the Z0 were studied at energies around the Z0-pole of 91.2 Gev. From a comparison with order-alpha-s-squared analytical formulae, the strong coupling constant, alpha-s, was measured. The results obtained were From the EEC: 0.132 +/- 0.006 +0.012/-0.009 From the AEEC: 0.109 +/- 0.007 +0.011/-0.007 where the first error is experimental and the second is due to scale uncertainty. The EEC was also studied for particle clusters and compared with a parton-level Monte Carlo simulation using an exact order-alpha-s-squared matrix element formula. From this study, the value of alpha-s obtained was From clustered EEC: 0.111 +0.016/-0.013 An observation of the effects of coherence in b-quark fragmentation was made, leading to evidence in support of the principle of Local Parton-Hadron Duality. An attempt was made to discriminate between samples of quark and gluon jets using the EEC function. No clear conclusion was reached due to limited statistics and the energy mismatch between quark jets and gluon jets.
In August/September 2001, a group of 75 physicists from 51 laboratories in 15 countries met in Erice, Italy to participate in the 39th Course of the International School of Subnuclear Physics. This volume constitutes the proceedings of that meeting. It focuses on the theoretical and phenomenological developments in string theory, as well as in all the other sectors of subnuclear physics. In addition, experimental highlights are presented and discussed.
We present the energy-energy correlation (EEC) distribution and its asymmetry (AEEC) in hadronic decays of [Zeta][sup 0] bosons measured by the SLD at SLAC. The data are found to be in good agreement with the predictions of perturbative QCD and fragmentation Monte Carlo models of hadron production. After correction for hadronization effects the data are compared with [Omicron]([alpha][sub s][sup 2]) perturbative QCD calculations from various authors. Fits to the central region of the EEC yield substantially different values of the QCD scale [lambda][sub [ovr MS]] for each of the QCD calculations. There is also a sizeable dependence of the fitted [lambda][sub [ovr MS]] value on the QCD renormalization scale factor, f. Our preliminary results are [alpha][sub s](M [sub Z]) = 0.121 [plus minus] 0.002(stat.) [plus minus] 0.004(exp.sys.) [sub [minus]0.009][sup +0.016] (theor.) for EEC and [alpha][sub s](M[sub Z]) = 0.108 [plus minus] 0.003(stat.) [plus minus] 0.005(exp.sys.)[sub [minus]0.003][sup +0.008](theor.) for AEEC. The largest contribution to the error arises from the theoretical uncertainty in choosing the QCD renormalization scale.
We present a preliminary study of correlations in rapidity between pairs of identified charged pions, kaons and protons in the SLD data. Details of short-range charge correlations between all combinations of these hadron species are used to study the locality of quantum number conservation, and suggest local charge ordering along the entire hadronization chain. A strong long-range KK− correlation is observed at high-momentum and weaker long-range [pi]-[pi]−, [pi]+-K− and p-K− correlations are observed in light flavor events, providing new information on leading particle production in u, d and s jets. The long-range correlations observed in c{bar c} and b{bar b} events are markedly different and consistent with expectations based on known decay properties of the leading heavy hadrons. The SLC electron beam polarization is used to tag the quark hemisphere in each event, allowing the first study of rapidities signed relative to the quark (vs. antiquark) direction. Distributions of ordered, signed rapidity differences provide a new probes of the fragmentation process, including the first direct observation of baryon number ordering along the q 2!{bar q} axis.
We present a preliminary study of correlations in rapidity between pairs of identified charged pions, kaons and protons using the entire SLD data sample of 550,000 hadronic Z° decays. Short range charge correlations are observed between all combinations of these hadron species, indicating local conservation of quantum numbers and charge ordering in the jet fragmentation process. The rapidity range of this effect is found to be independent of particle momentum. A strong long-range K-K− correlation is observed at high-momentum and weaker long-range [pi]-[pi]−, [pi]+-K− and p-K− and p{bar p} correlations are observed in light flavor events, providing new information on leading particle production in u, d and s jets. The long-range correlations observed in c{bar c} and b{bar b} events are markedly different and consistent with expectations based on known decay properties of the leading heavy hadrons. In addition, 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 ordered differences in signed rapidity between pairs of particles provide a direct probe of quantum number ordering along the quark-antiquark axis and other new insights into the fragmentation process.
We have studied hadronic final states produced in the decays of Z bosons using the Mark II detector at SLC. We have measured the distributions of global shape parameters, inclusive charged particle distributions, charge particle multiplicity and jet multiplicity. The results are compared to predictions of QCD-based models optimized at the PEP energy. The data and models agree within the present statistical precision. We have also investigated a new method to determine the QCD scale parameter [Lambda]{sub {ovr MS}} using differential jet multiplicity. 9 refs., 5 figs.