A chi**2 test used for particle identification with the Hall A RICH detector at JLab
200913 pages
Published in:
- Nucl.Instrum.Meth.A 612 (2009) 56-68
Report number:
- JLAB-PHY-09-1071
Experiments:
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Abstract: (Elsevier)
An algorithm, based on the @g^2 test, employed for particle identification by RICH detectors, is described. This algorithm is independent and complementary to the traditional algorithm based on the comparison between the average of the measured Ch erenkov angles and the expected Cherenkov angles of the photons generated in the RICH by the particle to be identified. On the other hand it is much simpler and faster than a full likelihood analysis of the full event pattern. The particle rejection ratio s achievable with the combined use of this algorithm and the algorithm based on the comparison between the average and the expected Cherenkov angles are very high. The algorithm also allows one to identify noise easily. The application of the algorithm is shown for the Hall A RICH detector in the E94-107 experiment at JLab. In this experiment an enormous background made up of pions and protons is 30000 times bigger than the signal and had to be identified and rejected in order to extract the kaons from th e electroproduction of hypernuclei.- hypernucleus: electroproduction
- RICH
- particle identification: (p K pi)
- radiation: Cherenkov
- angular dependence
- Jefferson Lab
- background
- noise
- statistical analysis
- cluster
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