The Preshower (PSh) detector is a component of the DIRAC setup. It is designed to improve rejection efficiency of e-e+ pairs background in the {\pi}{\pi} and K{\pi} pair measurement. To increase the overall efficiency, a new two-layer structure scintillator Preshower detector has been realized in the region where the Nitrogen Cherenkov detector has been shortened to introduce new detectors. The new Preshower-Cherenkov combination ensures the electron rejection efficiency better than 99.9% in momentum region 1-7 GeV/c.
Cite
@article{arxiv.1408.4246,
title = {New Preshower detector for DIRAC Experiment},
author = {M. Pentia and S. Aogaki and D. Dumitriu and D. Fluerasu and M. Gugiu and V. Yazkov},
journal= {arXiv preprint arXiv:1408.4246},
year = {2015}
}