450 research outputs found
Design and Assessment of a 2.5-Gb/s Optical Wireless Transmission System for High Energy Physics
No full textWe designed, realized, and tested a 2.5-Gb/s optical wireless communication (OWC) system prototype, that should be employed in high energy physics (HEP) experiments, such as the compact muon solenoid (CMS). The system consists of off-the-shelf components, mainly a vertical cavity surface emitting laser (VCSEl) and a PIn photodiode with a proper ball lens. Since it should be used to transmit data among particle sensors in neighboring rings of the CMS, its target distance is 10 cm. Its most attractive feature is that it does not require a (complex) active tracking system because its measured tolerance to misalignment is around pm 1 mm (at 10-12 bit error rate). We also report the X-rays irradiation tests of all components (Quartz lens, VCSEl, and PIn photodiode): none of them showed any degradation up till 238-Mrad (Si) dose. These results indicate that the designed OWC can be a viable solution for future HEP experiments
Measurements of R(b) with impact parameters and displaced vertices
No full textWe present measurements of Rb using the SLD at the SLC. The analyses use 2D and 3D impact parameter tags and a displaced 3D vertex tag which all exploit the small size and stability of the e(+)e(-) interaction point and the precision 3D CCD pixel vertex detector to achieve high -tagging efficiencies and purities. The combined measurement yields R(b) = 0.229 +/- 0.011 and is consistent with standard model predictions
SURVEY OF THE RESPONSE OF STANDARD LIMITED STREAMER TUBES OVER THE COMPLETE RANGE OF 3-COMPONENT GAS-MIXTURES OF ISOBUTANE, CO2, ARGON
No full textSurvey of the Response of Standard Limited Streamer Tubes Over the Complete Range of 3-component Gas-mixtures of Isobutane, Co2, Argon
No full textSearch for supersymmetric particles with R-parity violation in Z decays
No full textSearches for supersymmetric particles produced in e+e− interactions at the Z peak have been performed under the assumptions that R-parity is not conserved, that the dominant R-parity violating coupling involves only leptonic fields, and that the lifetime of the lightest supersymmetric particle can be neglected. In a data sample collected by the ALEPH detector at LEP up to 1993, and corresponding to almost two million hadronic Z decays, no signal was observed. As a result, supersymmetric particle masses and couplings are at least as well constrained as under the usual assumption of R-parity conservation
The Digital Data Acquisition Chain and the Cosmic-ray Trigger System For the Sld Warm Iron Calorimeter
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