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A search has been performed for the Standard Model Higgs boson in the data sample collected with the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV. An excess of 3 σ beyond the background expectation is found, consistent with the production of the Higgs boson with a mass near 114 GeV/c 2. Much of this excess is seen in the four-jet(More)
The cross sections and forward-backward asymmetries of hadronic and leptonic events produced in e + e − collisions at centre-of-mass energies from 130 to 183 GeV are presented. Results for e + e − , µ + µ − , τ + τ − , q¯ q, b ¯ b and c¯ c production show no significant deviation from the Standard Model predictions. This enables constraints to be set upon(More)
Biosynthetic conversion of Ia oligomers from three chains (alpha, beta, gamma) to two (alpha, beta) before surface expression was inhibited in B lymphoid cells by treatment with chloroquine, resulting in the accumulation of Ia complexes composed of mature alpha and beta chains, and gamma chains at various states of sialylation. Other stages of Ia(More)
The production of micro-corrosion casts suitable for scanning electron microscopy (SEM) is described in this tutorial. The casts are produced by filling an internal luminal system or space with a liquid medium which becomes solid in situ. The surrounding tissue is then removed (corroded) and the resulting replica is dried, rendered conductive, and examined(More)
The rate of gluon splitting into c¯ c pairs in hadronic Z decays is measured using the data sample collected by ALEPH from 1991 to 1995. The selection is based on the identification of leptons (electrons and muons) originating from semileptonic charm decays, and on the topological properties of signal events. The result derived from the selected sample is g(More)
Methods for preparing experimental animal tissues for the scanning electron microscope (SEM) have evolved from so many sources, with such lack of standardization that interpretation of the results is difficult, and inter-investigation comparisons usually impossible. To distinguish the surface changes inherent in any protocol for the preparation of bulk(More)
Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one(More)