369 research outputs found
A New Technique For The Preparation Of Highly Sensitive Hydrogen Sensors Based On Sno2 (Bi2o3) Thin-Films
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Development of a cylindrical scintillating fiber tracker for experiment E835 at FNAL
No full textA tracking detector made of scintillating fibers wound on a cylinder is being developed at FNAL, for the experiment E835 (study of the spectroscopy of charmonium formed in p (p) over bar annihilations, at the Fermilab Antiproton Accumulator). The tracker will be used for the measurement of the polar angle, i.e. of the longitudinal coordinate. The small amount of light from the fibers will be detected by solid state devices (Visible Light Photon Counters) with very high QE, currently being developed and tested by the D0 Fiber Tracking Group at FNAL. This paper reports the performance of a prototype fiber tracker, as measured at FNAL. We present results on light yield/mip, attenuation, efficiency, homogeneity of response and cross-talk. The data are then compared with Monte Carlo predictions. We measured an average number of 14 photoelectrons per mip and a very low noise level. An efficiency greater than 99% is foreseen for the future double layered tracker
Detection Of Sub-Ppm H2s Concentrations By Means Of Sno2(Pt) Thin-Films, Grown By The Rgto Technique
No full textRadiation Detector Success: Particle Physics and Heart Patients Benefit from Instrumentation Developed for Space
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Measurement of the charged multiplicities in b, c and light quark events from Z0 decays
No full textAverage charged multiplicities have been measured separately in b, c and light quark (u, d, s) events from Z(0) decays measured in the SLD experiment. Impact parameters of charged tracks were used to select enriched samples of b and light quark events, and reconstructed charmed mesons were used to select c quark events. We measured the charged multiplicities: = 20.21 +/- 0.10(stat.) +/- 0.22(syst.), = 21.28 +/- 0.46(stat.)(-0.36)(+0.41)(syst.) and = 23.14 +/- 0.10(stat.)(-0.37)(+0.38)(syst.), from which we derived the differences between the total average charged multiplicities of c or b quark events and light quark events: = 1.07 +/- 0.47(stat.)(-0.30)(+0.36)(syst.) and = 2.93 +/- 0.14(stat.)(-0.29)(+0.30)(syst.). We compared these measurements with those at lower center-of-mass energies and with perturbative QCD predictions. These combined results are in agreement with the QCD expectations and disfavor the hypothesis of flavor-independent fragmentation
The dose mapping system for the electromagnetic calorimeter of the BaBar experiment at SLAC
No full textThe BaBar detector: Upgrades, operation and performance
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121729.pdf (Author’s version preprint ) (Open Access
Study of the structure of e(+)e(-)-> b(b)over-bar-g events and first limits on the anomalous chromomagnetic coupling of the b quark
No full textThe structure of e(+) e(-) --> g events was studied using Z(0) decays recorded in the SLC Large Detector experiment at SLAC. Three-jet final states were selected and the charge-coupled device-based vertex detector was used to identify two of the jets as b or (b) over bar. Distributions of the gluon energy and polar angle were measured over the full kinematic range for the first time, and compared with perturbative QCD predictions. The energy distribution is potentially sensitive to an anomalous b chromomagnetic moment kappa. We measured kappa to be consistent with zero and set the first limits on its value: -0.17<kappa<0.11 at 95% C.L. [S0556-2821(99)01121-2]
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