K. Sumorok

Multifractal analysis of minimum bias events in\(\sqrt s \) = 630 GeV\(\bar p\)p collisions

A search for multifractal structures, in analogy with multifractal theories, is performed on UA1 minimum bias events. A downward concave multifractal spectral function,f(α) (where α is the Lipschitz-Hölder exponent), indicates that there are self-similar cascading processes, governing the evolution from the quark to the hadron level, in the final states of hadronic interactions.f(α) is an accurate measure of the bin to bin fluctuations of any observable. It is shown that the most sensitive comparison between data and the Monte Carlo models, GENCL and PYTHIA 4.8 can be made usingf(α). It is found that these models do not fully reproduce the behaviour of the data.

Resolution of plastic streamer tubes with analog readout

Abstract Extruded plastic tubes coated with a resistive material, having a 1 cm 2 profile and central 100 μm anode wire are operated in limited streamer mode. The charge induced on an external layer of cathode strips aligned perpendicularly to the anode wire is measured and used to compute the streamer coordinate. Test results both with an X-ray source and a particle beam are presented. Spatial resolution of the other of 400 μm is observed over the 40 cm 2 area studied.

The electronics and parallel readout system for the UA1 limited-streamer tubes muon detector

Abstract A muon position detector based on limited streamer tubes has been built for the UA1 experiment at the CERN p p collider. The tubes are arranged in chambers equipped with electronics to allow for analog readout of the induced signals on strips. The electronics module for charge amplification and conversion (STAR), the data acquisition system based on the VME standard and the performance of the detector will be described.