As online trigger for events containing Λ hyperons in p+p collisions at 3.1GeV a silicon-based device has been designed and built. This system has been integrated close to the target region within the FOPI spectrometer at GSI and was also employed as a tracking device to improve the vertex reconstruction of secondary decays. The design of the detector components, read-out, the trigger capability as well as the tracking performance are presented. An enrichment factor of about 14 was achieved for events containing a Λ-hyperon candidate.
@article{arxiv.1307.7470,
title = {Si$\Lambda$ViO: A Trigger for $\Lambda$-Hyperons},
author = {Robert Muenzer and Martin Berger and Laura Fabbietti},
journal= {arXiv preprint arXiv:1307.7470},
year = {2019}
}