Pole position of Λ(1405) measured in d(K^-,n)πΣ reactions

The current work was performed by an international research collaboration, E31, involving scientists from Research Center for Nuclear Physics (RCNP), Osaka University together with RIKEN, KEK, JAEA, J-PARC, Tohoku University, INFN (Italy), SMI (Austria) and others.

Research representives:
Prof. Hiroyuki Noumi, RCNP, Osaka University/IPNS, KEK
Dr. Fuminori Sakuma, RIKEN Cluster for Pioneering Research, RIKEN
Dr. Tadashi Hashimoto, Advanced Science Research Center, JAEA
Prof. Hiroaki Ohnish, Research Center for Electron Photon Science, Tohoku University
Prof. Catalina Curceanu, Laboratori Nazionali di Frascati, INFN
Prof. Johannes Zmeskal, Stefan-Mayer-Institut für subatomare Physik

Summary: Researchers from Osaka University created a bound state of a proton and a K- meson known as Λ(1405), and measured its mass. The data implied that it consisted of five quarks. This work may help scientists develop a theory of exotic matter that existed in the early Universe or in neutron stars.

The article, “Pole position of Λ(1405) measured in d(K−,n)πΣ reactions,” was published in Physics Letters B at DOI: https://doi.org/10.1016/j.physletb.2022.137637.

Please refer to the press release for details.