122298346
Studies of quark and gluon jet properties at LEP
Abstract In this short review, necessarily incomplete and qualitative, some selected results on global properties of quarks and gluons and the most recent results from the study of differences between quark and gluon jets produced at LEP, are presented.
14257235
Multiplicity difference between heavy- and light-quark jets revisited
Abstract.The perturbative QCD approach to multiparticle production predicts a characteristic suppression of particle multiplicity in a heavy-quark jet as compared to a light-quark jet. In the modified leading logarithmic approximation (MLLA) the multiplicity difference $\delta_{Q\ell}$ between heavy- and light-quark jets is derived in terms of a few other experimentally measured quantities. The earlier prediction for b-quarks needs revision in the light of new experimental results and the improvement in the understanding of the experimental data. We now find $\delta_{b\ell} = 4.4\pm0.4$. The updated MLLA results on $\delta_{b\ell}$ and $\delta_{c\ell}$ are compared with the present data from e + e- annihilation. Their expected energy independence is confirmed within the energy range between 29 and 200 GeV; the absolute values are now in better agreement with experiment than in the previous analysis, and the remaining difference can be attributed largely to next-to-MLLA contributions, an important subset of which are identified and evaluated.
120931449
MULTIPLICITY DIFFERENCE BETWEEN HEAVY AND LIGHT QUARK JETS
120768704
Maximum charged particle densities in small intervals of rapidity at ISR energies
108870820
A 64 channel, remotely controlled power supply for photomultipliers
Abstract We describe design, circuitry and the performance of a programmable system (FRAM 77 HV System) to supply and control high voltages in a large scintillation counter system. Sixty four HV channels are housed in a single crate preserving modular construction. A programmable CAMAC unit remotely controls the HV system through a high speed serial link; manual control is provided by a special purpose unit. In the HV crate the analog-digital interface uses a time-multiplexed technique. Each HV generator is a switching DC-DC converter with pulsewidth modulation. It supplies up to 2 mA from 0.3 to 3 kV. Digital resolution, both in setting and reading operation, is 1 V; overall stability is better than 0.2%.
123145058
High-energy coherent interaction of deuterons on protons
Abstract The reaction dp → d + (mm) has been performed with the aim of studying coherent interactions. The produced missing mass (mm) is in a pure isospin state T= 1 2 . We observe a significant inelastic coherent production at small transfer, decreasing with momentum transfer in a fashion similar to elastic scattering.
121910914
A GeSi active target for the measurement of short lifetimes
Abstract A new GeSi active target is presently used in the NA1 experiment at CERN to study photoproduction of charmed particles and to measure their lifetimes. Some general comments on the active target technique are made.
119964371
Measurement of Medium Energy Alpha-Proton Elastic Scattering beyond the First Minimum Region
121557682
A set of multigap plane proportional chambers with optimised sensitive surface area for a vertex detector
The construction and performance of multigap plane multiwire proportional chambers (MWPCS) 108*108 cm2 are described. Relevant details on the construction procedure and the results of operating tests are reported. These chambers are operating in the NAl experiment at SPS, CERN.