[en] τ polarization results of four LEP experiments, published and preliminary, are reviewed. Measurements of τ polarization are performed using five main exclusive decay modes of τ lepton as well as inclusive methods. In the framework of the Standard Model the results can be interpreted as a measurement of the ratio of vector to axial-vector weak neutral couplings for electrons and for taus consistent with the e-τ universality. The effective electroweak mixing angle is determined to be sin² θ_eff 0.2325 ± 0.00008 if the universality is assumed

[en] This paper reviews searches for lepton flavour-changing neutral currents in Z decays at LEP. Presented results of all four LEP collaborations are preliminary. ((orig.))

[en] This paper summarizes searches for sequential and excited heavy leptons at LEP2 using 1996 data (center of mass energies 161 and 172 GeV)

[en] Exclusive ρρ production in two-photon collisions is studied at LEP for quasi-real photons (γγ, centre-of-mass energies 161 GeV ≤ √s ≤ 209 GeV, total integrated luminosity L = 698 pb^?1) and one virtual photon (γγ^*, 89 GeV ≤ √s ≤ 209 GeV L 855 pb^?1). The cross sections of the ρρ production processes are determined as a function of the photon virtuality, Q², and the two-photon centre-of-mass energy, W, in the kinematic region: Q² ≤ 30 GeV² and 1 GeV ≤ W ≤ 3 GeV. (author)

[en] The K⁰_sK⁰_s and π⁺π^-π⁰ final states in two-photon collisions are studied with the L3 detector at LEP. A full energy dependent partial wave analysis demonstrates that the two-photon mass spectra are dominated by the formation of tensor mesons. Their masses, widths and two-photon partial widths are determined. (orig.)

[en] We describe the recent status of the CMS Endcap Muon System Cathode Strip Chambers (CSC), tests carried out and the performance of the system. Physical examples are given, stressing the importance of the subdetector both for first low luminosity physics and for the discovery potential of CMS

[en] Exclusive ρ⁰ρ⁰ and ρ⁺ρ^- production in two-photon collisions for quasi-real photons and ρ⁰ρ⁰ production, involving highly virtual photons, was measured by the L3 experiment at LEP. The spin-parity-helicity analysis of ρ⁰ρ⁰ and ρ⁺ρ^- systems at Q² ∼ 0 was performed. A dominance of J^P = 2⁺ and helicity 2 is observed. The cross sections of the process γγ^* → ρ⁰ρ⁰ for 1.2 < Q² < 30 GeV² and for 1.1 < W_γγ < 3.0 GeV are determined as a function of photon virtuality Q² and as a function of the two-photon center-of-mass energy W_γγ

[en] A gas sampling calorimeter with uranium absorbers was built and tested in a beam of pions and electrons of 1 to 6 GeV/c. As far as the detection of electromagnetic showers is concerned, no difference between uranium and a conventional absorber is found. The energy dependence of the resolution of the calorimeter for hadrons is given for 4.5 and 9 mm sampling. The measured π/e ratio is 0.83+-0.03. (orig.)

[en] The front-end electronics system for the anode signals of the CMS Endcap Muon cathode strip chambers has about 183,000 channels. The purposes of the anode front-end electronics are to acquire precise muon timing information for bunch crossing number identification at the Level-1 muon trigger system and to provide a coarse radial position of the muon track. Each anode channel consists of an input protection network, amplifier, shaper, constant-fraction discriminator, and a programmable delay. The essential parts of the electronics include a 16-channel amplifier-shaper-discriminator ASIC CMP16 and a 16-channel ASIC D16G providing programmable time delay. The ASIC CMP16 was optimized for the large cathode chamber size (up to 3x2.5 m²) and for the large input capacitance (up to 200 pF). The ASIC combines low power consumption (30 mW/channel) with good time resolution (2-3 ns). The delay ASIC D16G makes possible the alignment of signals with an accuracy of 2.2 ns. This paper presents the anode front-end electronics structure and results of the preproduction and the mass production tests, including radiation resistance and reliability tests. The special set of test equipment, techniques, and corresponding software developed and used in the test procedures are also described

[en] The design and the mass production of the proportional wire chambers for the barrel part of the uranium-gas sampling hadron calorimeter of the L3 detector at the CERN Large Electron-Positron storage ring (LEP) are described. The chambers meet the specific requirements arising from the limited space available to the calorimeter, the radioactivity of uranium, and the physics criteria of good energy and position resolution for incident hadrons. The mass production techniques employed ensured that all of the 371664 chamber cells have uniform response (with 5% accuracy) to ionizing particles. Over 8000 chambers of the same design, in 53 different sizes, were manufactured and tested at the ITEP (Moscow), at the University of Michigan (Ann Arbor) and at the IHEP (Beijing). (orig.)