Search for Low-Energy Resonances in the Electron-Positron Annihilation-in-Flight Photon Spectrum
1988; American Physical Society; Volume: 60; Issue: 22 Linguagem: Inglês
10.1103/physrevlett.60.2242
ISSN1092-0145
AutoresS. H. Connell, R. W. Fearick, R. F. Alfred Hoernlé, E. Sideras‐Haddad, J.P.F. Sellschop,
Tópico(s)Dark Matter and Cosmic Phenomena
ResumoWe present the results of a search for resonantlike structures in the two-photon decay channel of the ${e}^{+}\ensuremath{-}{e}^{\ensuremath{-}}$ system at energies corresponding to the anomalous peaks seen at Gesellschaft f\"ur Schwerionen-forschung in heavy-ion reactions. Within our sensitivity, no evidence for resonances at the 3% level was found. This enables us to exclude the existence of a Wong-Becker-type particle and to set an upper limit on the ratio $\frac{{\ensuremath{\Gamma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}}{{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}}\ensuremath{\le}0.7$ at 810 keV.
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