Resonance Structure in the $\gamma \gamma$ Invariant Mass Spectrum in $p$C- and $d$C-Interactions

Kh. U. Abraamyan, M. I. Baznat, A. V. Friesen +10

Along with ${\pi }^0$ and $\eta$ mesons, a resonance structure in the invariant mass spectrum of two photons at $M_{\gamma \gamma }=360\pm 7\pm 9$ MeV is observed in the reaction $dC\to \gamma +\gamma +X$ at…