Abstract

• The research work is to analyze the missing mass and the invariant mass spectra of D (K-, n) (1405) reaction process which was conducted at J-PARC E31 experiment with 1.0 GeV/c incident momentum of K-. This reaction is expected to enhance a virtual N K scattering process, where a K- beam kicks a neutron out of the deuteron target in a forward angle and is slowing down to form a (1405) with a residual nucleon. We have calculated the missing mass spectrum D(K-, n) Y reaction with Greens function method by using YA potential for N K interaction. We have also used the NK coupled channel Yukawa type separable potential to compute the invariant mass spectrum. We observed that the missing mass spectrum of the D (K-, n) Y reaction at a neutron forward angle has two peaks below the K-p threshold and above the threshold respectively. The former peak represents (1405) state while the latter is a quasi-free K-p peak. . We have analyzed the invariant mass spectrum of 0 In,KD where final state is given in 0 I isospin basis. Our calculated invariant mass spectrum of shows the prominent peak below the threshold while quasi-free part is largely suppressed. We have also studied the invariant mass spectrum with final charge states separately which are +- , -+ , 0 0