MUON TRIGGER SYSTEM IN THE TOPAZ DETECTOR

Authors
UJIIE N TAUCHI T TAKAHASHI T TERAMOTO Y
Citation
N. Ujiie et al., MUON TRIGGER SYSTEM IN THE TOPAZ DETECTOR, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 371(3), 1996, pp. 421-427
Citations number
14
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
371
Issue
3
Year of publication
1996
Pages
421 - 427
Database
ISI
SICI code
0168-9002(1996)371:3<421:MTSITT>2.0.ZU;2-4
Abstract
A redundant muon trigger system was implemented at the TOPAZ detector for the phase-II TRISTAN experiment. This system is mainly based on fa st signals from barrel muon chambers, and is free from the other track ing detectors. The trigger rate has been stable at 0.5 Hz, which was d ominated by cosmic-ray background. The trigger efficiency was obtained to be 92.5+/-0.7% for the e(-)e(+) --> mu(+)mu(-)(gamma) process in t he polar-angular region of \cos theta(mu)\ < 0.63. With this system, t he inefficiency of the previous trigger system was measured with an ac curacy of O(0.1%) for the above process.