A search for deeply-bound kaonic nuclear states at J-PARC

The J-PARC E15 experiment will be performed to search for the simplest kaonic nuclear bound state, K − pp , by the in-flight 3 He( K − ,n) reaction. The exclusive measurement can be performed by a simultaneous measurement of the missing mass using the primary neutron and the invariant mass via the expected decay, K − pp → Λp → pπ − p . In this report, an overview of the experiment and the preparation status are presented.