2010/11/02 by Q. Haider, Q Haider, Lon-chang Liu +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1088/0954-3899/37/12/125104
published as J.Phys.G37:125104,2010 · 12 pages, 3 figures
arxiv created 2010/11/02 · openalex publication_date 2010/11/12 · arxiv updated 2010/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The missing-mass spectrum obtained in a recoil-free transfer reaction p ( 27 Al, 3 He)π − p 'X is analyzed. We find that the observed peak structure arises from the coherent contributions from two reaction processes in the energy region corresponding to a bound eta (η) meson. In one of the processes, the intermediate η is captured by the nucleus to form the η-mesic nucleus 25 Mg . In the other process, the η does not form an η–nucleus bound state. The interference between these two processes has caused the peak of the spectrum to appear at an η binding energy stronger than the actual one. Our analysis also indicates that the data are consistent with an attractive N*(1535)–nucleus interaction at energies below the ηN threshold.