2014/10/29 by G. Agakishiev, O. Arnold, D. Belver +103 · 1 citation
Mathematics · Physics and Astronomy · #Atomic physics #CLs upper limits #Cluster (spacecraft) #Cluster state #Computer science #Hadron #High-Energy Particle Collisions Research #Invariant (physics) #Invariant mass #Isospin #Limit (mathematics) #Mass spectrometry #Mass spectrum #Mathematics #Meson #Nuclear physics #Partial wave analysis #Particle physics theoretical and experimental studies #Physics #Quantum #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Range (aeronautics) #Spectral line #nucl-ex
paper · pdf · doi:10.1016/j.physletb.2015.01.032
7 Pages, 5 Figures
arxiv created 2014/10/29 · openalex publication_date 2015/01/26 · arxiv updated 2015/04/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5GeV)+p→pK+Λ. This reaction might contain information about the kaonic cluster “ppK−” (with quantum numbers JP=0− and total isospin I=1/2) via its decay into pΛ. Due to interference effects in our coherent description of the data, a hypothetical K‾NN (or, specifically “ppK−”) cluster signal need not necessarily show up as a pronounced feature (e.g. a peak) in an invariant mass spectrum like pΛ. Our PWA analysis includes a variety of resonant and non-resonant intermediate states and delivers a good description of our data (various angular distributions and two-hadron invariant mass spectra) without a contribution of a K‾NN cluster. At a confidence level of CLs=95% such a cluster cannot contribute more than 2–12% to the total cross section with a pK+Λ final state, which translates into a production cross-section between 0.7 μb and 4.2 μb, respectively. The range of the upper limit depends on the assumed cluster mass, width and production process.