2003/01/31 by LEPS Collaboration, T. Nakano, D. S. Ahn +50 · 858 citations
Physics and Astronomy · #Atomic physics #Baryon #Nuclear physics #Nuclear physics research studies #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #Strangeness #hep-ex
paper · pdf · doi:10.1103/physrevlett.91.012002
published in Physical Review Letters 91(1), 012002 (American Physical Society) · 12 pages, 3 encapsulated postscript figures
openalex publication_date 2003/07/03 · arxiv created 2003/07/08 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The \ensuremathγn\ensuremath→K+K^\ensuremath-n reaction on 12C has been studied by measuring both K+ and K^\ensuremath- at forward angles. A sharp baryon resonance peak was observed at 1.54\ifmmode±\else\textpm\fi0.01 GeV/c2 with a width smaller than 25 MeV/c2 and a Gaussian significance of 4.6\ensuremathσ. The strangeness quantum number (S) of the baryon resonance is +1. It can be interpreted as a molecular meson-baryon resonance or alternatively as an exotic five-quark state (uudds) that decays into a K+ and a neutron. The resonance is consistent with the lowest member of an antidecuplet of baryons predicted by the chiral soliton model.