Author/Authors :
Yamaga، نويسنده , , T. and Ishikawa، نويسنده , , T. and Miyachi، نويسنده , , Y. and Morino، نويسنده , , Y. and Nakano، نويسنده , , T. and Noumi، نويسنده , , H. and Ozawa، نويسنده , , K. and Shirotori، نويسنده , , K. and Sugaya، نويسنده , , Y. and Tanida، نويسنده , , K.، نويسنده ,
Abstract :
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 ¯ 0 π − → K + π − π − . We designed a Ring Imaging Cherenkov (RICH) counter with two radiators, aerogel and C 4 F 10 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.
