Strong interaction physics from hadronic atoms

1997
61 pages
Published in:
  • Phys.Rept. 287 (1997) 385-445

Citations per year

199720042011201820250510152025
Abstract: (Elsevier)
Hadronic atoms provide a unique laboratory for studying strong interactions and nuclear medium effects at zero kinetic energy. Previous results from analyses of strong-interaction data consisting of level shifts, widths and yields in π − , K − , p̄ and ∑ − atoms are reviewed. Recent results from fits to comprehensive sets of data in terms of density-dependent optical potentials that respect the low-density limit, where the interaction tends to the free hadron nucleon value, are discussed. The importance of using realistic nuclear density distributions is highlighted. The introduction of density dependence in most cases significantly improves the fit to the data and leads to some novel results. For K − atoms, a substantial attraction of order 200 MeV in nuclear matter is suggested, with interesting repercussions for K̄ condensation and the evolution of strangeness in high-density stars. For p̄ atoms it is found that a reasonable p -wave strength can be accommodated in the fitted optical potential, in agreement with the energy dependence observed for some low-energy p̄N reactions. For ∑ − atoms, the fitted potential becomes repulsive inside the nucleus, implying that Σ hyperons generally do not bind in nuclei in agreement with recent measurements. This repulsion significantly affects calculated masses of neutron stars.
  • 24.10.Ht
  • 36.10.Gv
  • Exotic atoms
  • Optical model
  • Strong interactions
  • Density dependence
  • inspirereview:II-d-2
  • review
  • pi: mesic atom
  • K: mesic atom