16037187
A measurement of the charge asymmetry of hadronic events in electron positron annihilation
AbstractThe quark charge asymmetry, summed over flavours, has been measured at centre of mass energies of 35 GeV and 44 GeV using the JADE detector sited on the electron-positron storage ring PETRA. The asymmetry is found to be consistent with the expectations of the standard model at both energies and enables a measurement of the product of the axial-vector coupling constant of the electron with the axial-vector coupling constants of the quarks, assuming the moduli of these latter to be flavour independent. This gives, with reasonable assumptions concerning the effects of
$$B^0 \overline {B^0 } $$
 mixing,aeaq=−1.09±0.18±0.23 where the first error is statistical and the second systematic.
120548581
The OPAL jet chamber
Abstract The characteristic features of the OPAL jet chamber are described, such as the mechanical and electrical structure, the readout electronics, the gas system, and the laser setup for calibration. Results on spatial resolution and on particle identification power, obtained with a full scale prototype chamber, are presented which show that in the final chamber the anticipated performance can be reached.
120324718
Integration, commissioning and installation of monitored drift tube chambers for the ATLAS barrel muon spectrometer
The ATLAS experiment at the Large Hadron Collider (LHC) at CERN is currently being assembled to be ready to take data in 2007. Its muon spectrometer is designed to achieve a momentum resolution better than 10% at 1 TeV. In the barrel part, a toroidal air-core magnet is instrumented with three layers of Monitored Drift Tube (MDT) chambers for precision tracking. The Max-Planck-Institut fur Physik and the Ludwig-Maximilians-University in Munich have built 88 MDT chambers for the outermost barrel layer. We report on our experience with the tests of the MDT chambers, their integration with the Resistive Plate trigger chambers and the installation of the muon stations in the experiment. First results of their commissioning in the ATLAS detector will be presented.
121773836
A transputer network for data acquisition in a multichannel FADC system
Abstract Large multichannel Flash-ADC systems pose the problem of reducing and collecting data from many thousands of channels, residing in several crates. Custom systems like the DL300 Flash-ADC system used at the OPAL experiment at LEP, CERN, are usually more cost effective in large systems than assemblages based on standard busses, but need specific solutions to integrate them into the computing environment. Transputer links represent a powerful, yet easily usable medium for transporting data. The upgrade of the OPAL central jet chamber read-out system consists of a new crate controller with one transputer per Flash-ADC crate. The resulting transputer network handles trigger distribution, data reduction and data transportation tasks. In future experiments, transputer networks may present an option to transport data from electronics, which is tightly integrated into the detector.
120445135
An experimental study of the antineutron-light nucleus annihilation at 1.4 GeV/c
The heavy liquid bubble chamber, Gargamelle, has been used to investigate the gross features of the annihilation of antineutrons in light nuclei (mainly Carbon). Results are presented on the distributions of multiplicity, momentum and emission angle for charged pions and protons together with a simple model to describe them.
40317421
Distributed Data Acquisition for BNL802 I: The Front End
The BNL experiment 802 acquisition system comprises three VME crates. Data from Camac- and Fastbus-resident digitizers is collected via 68000-based intelligent Camac interfaces and via a Fastbus-VMX DMA engine. Complete events are shipped to processor elements (68020 / 68881) for formatting and third-level trigger decisions before transmission to the VAX host.
1345747
Inhomogeneous Cosmological Models Containing Homogeneous Inner Hypersurface Geometry. Changes of the BIANCHI Type.
There are investigated such cosmological models which instead of the usual spatial homogeneity property only fulfil the condition that in a certain synchronized system of reference all spacelike sections t = const. are homogeneous manifolds. This allows time-dependent changes of the BIANCHI type. Discussing differential-geometrical theorems it is shown which of them are permitted. Besides the trivial case of changing into type I there exist some possible changes between other types. However, physical reasons like energy inequalities partially exclude them. 
 
 
 
Es werden kosmologische Modelle betrachtet, die anstelle der ublichen raumlichen Homogenitatseigenschaft nur die Bedingung erfullen, das in einem gewissen synchronisierten Bezugssystem alle Raumschnitte t = const. homogene Mannigfaltigkeiten sind. Neben dem trivialen Fall des Wechsels zu Typ I gibt es einige mogliche Anderungen zwischen anderen Typen. Physikalische Grunde wie Energieungleichungen schliesen diese jedoch teilweise aus.