Exploring Exotic Hadrons Using Hyperon Spectrometer at J-PARC

Experimental programs on searching for exotic hadrons at the J-PARC hadron facility are presented. Recently, the J-PARC E42 completed a data collection to search for the six-quark state, H-dibaryon, in the bound and unbound mass regions near the ΛΛ threshold in 12C(K-,K+) reactions at 1.8 GeV/c. The H-dibaryon can be reconstructed exclusively from Λpπ−, ΛΛ and Ξ−p systems using the large-acceptance Hyperon Spectrometer, which consists mainly of a 1-T superconducting magnet and a GEM time projection chamber (HypTPC). The ongoing analysis progress and the anticipated results are reported. Furthermore, the recent observation of narrow hidden-charm pentaquark states by the LHCb Collaboration raises the question about the existence of the light pentaquarks. In light of this, the experimental attempts to search for the light pentaquark in K+d → K0pp reactions using the Hyperon Spectrometer at J-PARC are also discussed.