We have proposed an experiment for studying charmed baryons via the p(π-,D∗-) reaction at the J-PARC high-momentum beam line. Charmed baryons will be measured by a missing mass method. Scattered D∗- will be reconstructed by detecting its decay chain of D∗-→D¯0π-→K+π-π-. We designed a Ring Imaging Cherenkov (RICH) counter with two radiators, aerogel and 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 π 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(π-,D∗-) spectrum increases only 5% due to the wrong identifications.
|ジャーナル||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|出版ステータス||Published - 2014 12 1|
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