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The results of an analysis of the invariant mass spectra of photon pairsproduced in dC, pC and dCu interactions at momenta of 2.75, 5.5 and 3.83 GeV/cper nucleon respectively, are presented. Signals in the form of enhancedstructures at invariant masses of about 17 and 38 MeV/c2 are observed. Theresults of testing of the observed signals, including the results of the MonteCarlo simulation are presented. The test results support the conclusion thatthe observed signals are the consequence of detection of the particles withmasses of about 17 and 38 MeV/c2 decaying into a pair of photons.

Observation of structures at $\sim 17$ and $\sim 38$ MeV/c$^{2}$ in the  $\gamma\gamma$ invariant mass spectra in pC, dC, and dCu collisions at  $\textit{p}_{lab}$ of a few GeV/c per nucleon