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[en] Predictions from quantum chromodynamics and massive quark model for the quantity sigmasup(n)/sigmasup(p) as a function of Q2 and X are studied vs. the experimental results so far available
Journal
Lettere al Nuovo Cimento; ISSN 0024-1318; 
; v. 39(10); p. 197-201
; v. 39(10); p. 197-201
[en] From an analysis of inclusive lepton in data collected by the ALEPH detector at LEP, the b and c semileptonic branching ratios are measured applying a binned maximum likelihood fit on the (p,pt) lepton plane. The average fragmentation are also allowed to vary in the fit. Two independent measures are performed using electrons and muons. By combining them, Br(b→l)=10.3±0.49±0.020 and Br(c→l)=9.32±1.01 is obtained, where the standard model values have been assumed. (author) 3 refs.; 1 tab
Source
Davier, M.; Wormser, G. (eds.); Paris-11 Univ., 91 - Orsay (France). Lab. de l'Accelerateur Lineaire; 644 p; ISBN 2-86332-108-0; ; 1992; p. 447-451; Editions Frontieres; Paris (France); 4. International symposium on heavy flavour physics; Orsay (France); 25-29 Jun 1991
; 1992; p. 447-451; Editions Frontieres; Paris (France); 4. International symposium on heavy flavour physics; Orsay (France); 25-29 Jun 1991
[en] The principal component analysis is applied to a data sample, with the aim of retaining the smallest number of variables necessary to adquately describe the data. We find that in a particular example, of the initial 20 variables necessary to fully describe the data, only 10 principal components suffice to determine their structure. The application of these ideas to obtain a fast Monte Carlo event generator is discussed in detail for particle physics. (orig.)
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAE; v. 248(2/3); p. 488-490
; CODEN NIMAE; v. 248(2/3); p. 488-490
[en] Complete neutrino events are separated from the total sample with a discriminant analysis in a many-dimensional space described in the text. Two new powerful variables are found which discriminate with high efficiency and tag the event type as far as the completeness is concerned. (orig.)
Journal
[en] The latest BEBC (ABCDLOS) structure function results are analysed in the Altarelli-Parisi-type approach of Baulieu and Kounnas. The range of values for the scaling parameter lambda is computed in the second-order QCD approximation
Journal
Lettere al Nuovo Cimento; ISSN 0024-1318; ; v. 39(14); p. 327-330
; v. 39(14); p. 327-330
[en] A principal component analysis is applied to a sample of hadronic showers. Five ''factors'' are determined which enable us to generate the shower's longitudinal profile with negligible computing time. (orig.)
Journal
Nuclear Instruments and Methods in Physics Research; ISSN 0167-5087; ; v. 235(1); p. 70-73
; v. 235(1); p. 70-73
[en] New results about the simulation of Resistive Plate Chambers are reported; particular emphasis is put in the understanding of charge spectra in regions where deviations from the pure avalanche mode of operation can be present
Journal
[en] A model to simulate the avalanche formation process and the induced signal in a Resistive Plate Chamber is presented. A first investigation of the effects of various parameters on the performance of this detector is reported. (author)
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 431(3); p. 413-427
; CODEN NIMAER; v. 431(3); p. 413-427
[en] The latest results, still preliminary, of tests dedicated to study the performance of Resistive Plate Chamber for the CMS experiment are presented. Full efficiency with a 2 ns time resolution in conditions of incident flux up to 2 kHz/cm2 has been obtained. Detector uniformity has been studied and found to be well within the constraints due to the large surfaces used in the experiment. An aging test is currently being carried out and shows no significant performance variation with time
Journal
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