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The diquark correlation which is expectedly an essential degree of freedom to describe the hadron structure can be revealed from the study of charmed baryons. The experiment to observe and investigate the charmed baryon states was proposed at the J-PARC high-momentum beam line. The missing mass spectroscopy experiment via the π p ! Y + c D reaction with 20 GeV/c is performed for the systematic measurement of the excitation energy, the production rate and the decay products of charmed baryons. The decay particles from the D meson are detected by the forward magnetic spectrometer whose detection efficiency is 50 60%. The excited charmed baryons can be measured with the missing mass resolution of 10 MeV. To reduce the background level, we apply the D tagging and several event selections by using kinematical conditions from the t-channel dominance of the production. The sensitivity of 0.1 0.2 nb can be achieved. In addition, the decay measurement of the produced charmed baryons can also be performed to determine the branching ratio and identify the excited states from the analysis of the decay chain and angular distribution of decay products. The proposed experiment for the systematic measurement of the charmed baryons was found to be feasible.

Spectrometer for the charmed baryon spectroscopy experiment at the J-PARC high-momentum beam line