2015/12/31 by Shota Ohnishi, Yoichi Ikeda, Tetsuo Hyodo +2
Physics and Astronomy · #Baryon #Energy (signal processing) #High-Energy Particle Collisions Research #Lambda #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Sigma #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.93.025207
published as Phys.Rev. C93 (2016) 2, 025207 · 14 pages, 14 figures
openalex publication_date 2016/02/29 · arxiv created 2016/03/07 · arxiv updated 2016/03/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The \mathrm\ensuremathΛ(1405) resonance production reaction is investigated within the framework of the coupled-channels Alt-Grassberger-Sandhas (AGS) equations. We perform full three-body calculations for the KNN\text\ensuremath-\ensuremathπYN amplitudes on the physical real energy axis and investigate how the signature of the \mathrm\ensuremathΛ(1405) appears in the cross sections of the K^\ensuremath-d\ensuremath→\ensuremathπ\mathrm\ensuremathΣn reactions, also in view of the planned E31 experiment at J-PARC. Two types of meson-baryon interaction models are considered: an energy-dependent interaction based on chiral SU(3) effective field theory, and an energy-independent version that has been used repeatedly in phenomenological approaches. These two models have different off-shell properties that imply correspondingly different behavior in the three-body system. We investigate how these features show up in differential cross sections of K^\ensuremath-d\ensuremath→\ensuremathπ\mathrm\ensuremathΣn reactions. Characteristic patterns distinguishing between the two models are found in the invariant mass spectrum of the final \ensuremathπ\mathrm\ensuremathΣ state. The K^\ensuremath-d\ensuremath→\ensuremathπ\mathrm\ensuremathΣn reaction, with different (\ensuremathπ^\ifmmode±\else\textpm\fi\mathrm\ensuremathΣ^\ensuremath∓ and \ensuremathπ0\mathrm\ensuremathΣ0) charge combinations in the final state, is thus demonstrated to be a useful tool for investigating the subthreshold behavior of the KN interaction.