Signature of the Λ(1405) Resonance in Neutron Spectra from the K− + d Reaction
Neutron spectra from the reaction $${K^- + d \rightarrow \pi + \Sigma + n}$$ were calculated in the energy range $${E^{cm}_{K^-} = }$$ 0–50 MeV using coupled channel Faddeev equations for the description of the $${\bar{K} N N - \pi\Sigma N}$$ three-body system. The aim was to trace the signature of the Λ(1405) resonance in the spectra. We found, that while in the direct spectra kinematic effects mask completely the peak corresponding to the resonance, the deviation spectrum method of Esmaili et al. (Phys. Rev. C 83:055207, 2011) is able to eliminate kinematics and differentiate between different models of Λ(1405). Four different phenomenological $${\bar{K} N - \pi\Sigma}$$ interactions were used in order to study the effect of their pole positions on the neutron spectra.