[en] An experiment is described conducted in Berkeley in which the magnetic monopole was first detected. The objections are reported of prof. Fowler (U.K.) and prof. Alvarez (U.S.A.) permitting a different interpretation of experimental data. (Z.J.)

[en] The paper reports on two particle identification systems for the Belle II spectrometer, on the motivation for the upgrade of the Belle PID systems, the design criteria, and the chosen PID methods. It also discusses the status of the project

No abstract available

[en] It is shown that quantum systems of identical particles can be treated as different when they are in well-differentiated states. This simplifying assumption allows for the consideration of quantum systems isolated from the rest of the universe and justifies many intuitive statements about identical systems. However, it is shown that this simplification may lead to wrong results in the calculation of the entropy

[en] Data at √s = 35 GeV from the e⁺e^- collider PETRA has been analysed using information from the high precision vertex detector to determine the average lifetime of b flavoured hadrons. The B lifetime was measured using the average signed impact parameter of high PT muon tracks, which is related to the lifetime in a way which can be determined by Monte Carlo studies. The result was τ_B 1.32 ± 0.45 ± 0.14 ps, which is in good agreement with other measurements and with the world average. The b quark forward-backward asymmetry was also estimated using the b enriched data sample and was found to be -0.33± 0.27, again in good agreement with other measurements. A study of muon identification using DELPHI detector components is also presented. Data taken during a beam test of the electromagnetic and hadronic calorimeters and muon chambers were analysed to evaluate the efficiency of the muon chambers, and the ability of the hadron calorimeter to distinguish between muon and pion signals. The muon tag from the hadron calorimeter was shown to be valuable in suppressing the hadronic punchthrough background to the muon signal. Muon identification criteria were devised which could be used in analysis for the selection of muon candidate tracks, and the results were used to estimate the pion punchthrough background to the signal of the Higgs boson in the channel Z^o → H^o μ+μ-. (author)

[en] The techniques used for the particle identification are reviewed: time-of-flight method, identification by pulse discrimination, E-ΔE telescope, magnetic beam bending jointly with a position sensitive detector. The essential conditions to which a semiconducting material must satisfy to be usable as a γ ray detector are also recalled. The performance of various materials are compared: silicon, germanium, cadmium telluride, gallium arsenide, mercuric iodide, and diamond

[en] Neutral Higgs particles, Motivations and Properties, Onium → H⁰ + γ, Z⁰ → H⁰ + γ, Z⁰ → H⁰ + μ⁺μ^-, H⁰ + e⁺e^-, e⁺e^- → Z⁰ + H⁰, other reactions, charged particles, motivations and properties e⁺e^- → H⁺H^- e⁺e^- → W^+- H^+- heavy Q → H^+- +light q. (orig.)

No abstract available

[en] A detailed report on the time development of the charges induced by SQS is presented. The signals from a multicathode coaxial detector were integrated through gates from 150 ns down to 10 ns. The ratio of the charges induced on opposite cathode pads relative to the streamer direction is about 2, down to the shortest gate widths used; the charges collected are large, e.g. 2-3 pC at 20 ns. The angular distribution of the streamers shows a well defined correlation with the direction of arrival of the primary electrons, which is stronger for the smallest gate widths. (orig.)

[en] A procedure modelling ideal classical and quantum gases is discussed. The proposed approach is mainly based on the idea that modelling and algorithm analysis can provide a deeper understanding of particularly complex physical systems. Appropriate representations and physical models able to mimic possible pseudo-mechanisms of functioning and having predictive validity are developed. (paper)