Structure of the Λ (1405) resonance and the γp→K++(π ς)0 reaction

Abstract

Three-body calculations of the KK̄N system with quantum numbers I=1/2, Jπ=(12)+ were performed. Using separable potentials for two-body interactions, we calculated the πς mass spectra for the (K̄N)I=0+K+→(πς)0K+ reaction on the basis of the three-body Alt-Grassberger-Sandhas equations in the momentum representation. In this regard, different types of K̄N-πς potentials based on a phenomenological and chiral SU(3) approach were used. The possibility to observe the trace of the Λ(1405) resonance in the (πς)0 mass spectrum was studied. Using the χ2 fitting, it was shown that the mass of the Λ(1405) resonance is about 1417MeV/c2. © 2021 American Physical Society.