Search for the K−pp bound state via the in-flight 3He(K−, n) reaction

In the J-PARC E15 experiment, a K(-)pp search was performed via the He-3(K-, n) reaction at 1.0 GeV/c. A forward-going neutron is detected by a neutron counter with 15 m flight length, and decay particles from K(-)pp are simultaneously measured by a cylindrical detector system that surrounds a liquid He-3 target system. In March and May, 2013, we carried out the first physics data-taking with 5x10(9) incident kaons on the He-3 target, and we have obtained a preliminary exclusive analysis result of He-3(K-, Lambda p)n reaction.