Abstract

• The aim of this research work is to investigate the missing mass spectrum of D (K- , n) Λ (1405) reaction process of J-PARC (Japan Proton Accelerator Research Complex) E31 experiment. This experiment which was conducted at J-PARC with 1.0 GeV/c incident momentum of Kon target deuterium. This reaction is expected to enhance a virtual KN scattering process, where a Kbeam kicks a neutron out of the deuteron target in a forward angle and is slowing down to form a Λ(1405) with a residual nucleon. We have calculated the missing mass spectrum of D (K- , n) Y reaction with Green's function method by using YA (Yamazaki and Akaishi) potential for KN interaction. It is observed that the missing mass spectrum of the D (K- , n) Y reaction at a neutron forward angle has two peaks, one below the Kp threshold and another above the threshold. The former peak represents Λ (1405) quasi-bound state while the latter is a quasi-free Kp peak.