Development of PID counter for charmed baryon spectroscopy experiment at J-PARC

We have proposed an experiment for studying charmed baryons via the p( pi super(-),D super(*-))p( pi -,D*-) reaction at the J-PARC high-momentum beam line. Charmed baryons will be measured by a missing mass method. Scattered D super(*-)D*- will be reconstructed by detecting its decay chain of D*- ar...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2014-12, Vol.766, p.36-38
Main Authors: Yamaga, T., Ishikawa, T., Miyachi, Y., Morino, Y., Nakano, T., Noumi, H., Ozawa, K., Shirotori, K., Sugaya, Y., Tanida, K.
Format: Article
Language:English
Subjects:
Baryons
Detectors
Kaons
Monte Carlo methods
Photons
Pions
Proton accelerators
Spectrometers
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Summary:We have proposed an experiment for studying charmed baryons via the p( pi super(-),D super(*-))p( pi -,D*-) reaction at the J-PARC high-momentum beam line. Charmed baryons will be measured by a missing mass method. Scattered D super(*-)D*- will be reconstructed by detecting its decay chain of D*- arrow right D[macr]0 pi - arrow right K+ pi - pi -. We designed a Ring Imaging Cherenkov (RICH) counter with two radiators, aerogel and C sub(4)F sub(10)C4F10 of refractive indices 1.04 and 1.00137, respectively, in order to identify pions and kaons in a wide momentum range from 2 to 16 GeV/c . Spherical mirrors will be used to focus Cherenkov photons to the photon sensor alloys. The performance of the designed RICH counter is evaluated by a Monte-Carlo simulation based on GEANT4. Detection efficiency for scattered particles averaged over pi and K is found to be 99%. Wrong particle identification ratios of pions and protons to kaons are 0.1% and 0.14%, respectively. The background level in the inclusive p( pi super(-),D super(*-))p( pi -,D*-) spectrum increases only 5% due to the wrong identifications.
ISSN:0168-9002
DOI:10.1016/j.nima.2014.07.055