Large-Area Sandwich Veto Detector with WLS Fibre Readout for Hadron Spectroscopy at COMPASS
T. Schl\"uter, W. D\"unnweber, K. Dhibar, M. Faessler, R. Geyer, J.-F., Rajotte, Z.Roushan, H. W\"ohrmann

TL;DR
This paper presents a large-area sandwich veto detector with WLS fibre readout designed for hadron spectroscopy at COMPASS, achieving high detection efficiency and low false-veto probability to improve event selection.
Contribution
Introduction of a novel large-area sandwich veto detector with WLS fibre readout for enhanced event vetoing in high-energy physics experiments.
Findings
98% detection probability for minimum ionizing particles
3.5 times enrichment of exclusive events in data
1% false-veto probability
Abstract
A sandwich detector composed of scintillator and steel-covered lead layers was introduced in the fixed-target COMPASS experiment at CERN for vetoing events not completely covered by the two-stage magnetic spectrometer. Wavelength shifting fibres glued into grooves in the scintillator tiles serve for fast read-out. Minimum ionizing particles impinging on the detector outside of a central hole, sparing the spectrometer's entry, are detected with a probability of 98%. The response to charged particles and photons is modeled in detail in Monte Carlo calculations. Figures of merit of the veto trigger in (or nucleus) experiments are an enrichment of exclusive events in the recorded data by a factor of 3.5 and a false-veto probability of 1%.
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