Resonance structure in the γγ invariant mass spectrum in pC, dC, and dCu interactions


Along with π 0 and η mesons, a resonance structure in the invariant mass spectrum of two photons atM γγ = 360 ± 7 ± 9 MeV is observed in dC interactions at momentum 2.75 GeV/c per nucleon. This resonance structure is not observed in pC collisions at the beam momentum 5.5 GeV/c. The result obtained in the reaction dC is confirmed by the second experiment carried out on the deuteron beam at momentum 3.83 GeV/c per nucleon with a copper target. Some other checks of the observed effect are presented.

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Abraamyan, K.U., Baznat, M.I., Friesen, A.V. et al. Resonance structure in the γγ invariant mass spectrum in pC, dC, and dCu interactions. Phys. Atom. Nuclei 75, 657–660 (2012).

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  • Atomic Nucleus
  • Invariant Mass
  • Invariant Mass Distribution
  • Invariant Mass Spectrum
  • Beam Momentum