Three jet events arising from decays of the Z bo-son, collected by the DELPHI detector, were used to measure differences in quark and gluon fragmentation. Gluon jets were anti-tagged by identifying b quark jets. Unbiased quark jets came from events with two jets plus one photon. Quark and gluon jet properties in different energy ranges were compared for the… (More)
OBJECTIVES The purpose of this study was to analyze the prevalence of dental erosion among competitive swimmers of the local swimming club in Szczecin, Poland, who train in closely monitored gas-chlorinated swimming pool water. MATERIALS AND METHODS The population for this survey consisted of a group of junior competitive swimmers who had been training… (More)
A medium size prototype of Inverted Double Gap RPC made of low resistivity bakelite plates was tested in the GIF facility at the CERN SPS. The chamber efficiency as a function of the source intensity and its timing properties were studied and found to be excellent.
Two single gap medium-size RPC modules, made of bakelite plates of very good mechanical quality of the surface and having initial volume resistivity of 1 Â 10 10 O cm, were tested in the Gamma Irradiation Facility at CERN at ionisation rates up to 1 kHz=cm 2. The internal surfaces facing the gas volume of one RPC module were cladded with a thin layer of… (More)
A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminos-ity of about 48 pb 1 at an e + e centre-of-mass energy of 183 GeV and about 20 pb 1 equally shared between the centre-of-mass… (More)
In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, charged hadrons are identiied using the measurement of their energy loss and their Cherenkov angle. Rapidity correlations of-, proton-proton, and-proton pairs are compared. The agreement with the string and cluster fragmentation models is tested. For those pairs… (More)