The Trigger Control System of the COMPASS experiment at the CERN SPS distributes the first level trigger together with a unique event identifier and a very precise reference clock, that synchronizes the readout electronics, over a passive optical fiber network to 152 front-end modules. All signals are transmitted over a single optical fiber. The system in addition generates the readout dead-time and provides advanced management functions.
The second part presents an analysis of the transverse polarization of Lambda and Xi hyperons in quasi-real photo-production based on COMPASS data. Averaged over the whole kinematical range the Lambda shows a significantly positive polarization of +3.38+-0.32(stat.)+-0.13(sys.)%. The Anti-Lambda exhibits a slightly negative polarization of -1.51+-0.39(stat.)+-0.10(sys.)%. Both polarizations are studied in dependence on the kinematical variables x_F, p_T, y, and Q^2. Xi- and Anti-Xi+ are within the errors unpolarized.
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The Trigger Control System of the COMPASS experiment at the CERN SPS distributes the first level trigger together with a unique event identifier and a very precise reference clock, that synchronizes the readout electronics, over a passive optical fiber network to 152 front-end modules. All signals are transmitted over a single optical fiber. The system in addition generates the readout dead-time and provides advanced management functions.
The second part presents an analysis of the transverse p...
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