2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115678A new resonance structure at M = 355 \pm 6 \pm 9 MeV is observed in the invariant mass spectrum of two gamma-quanta produced in the reaction d + C => gamma + gamma + x at momentum 2.75 GeV/c per nucleon. Preliminary estimates of its width and cross section are Gamma = 41 \pm 12 MeV and sigma_{gamma-gamma} = 0.6 mkb. The collected statistics is 2680 \pm 310 events of 1.5 10^6 triggered interactions of a total number 3 10^{12} dC-interactions.10 pages, 10 figures, LaTeXNuclear ExperimentHigh Energy Physics - PhenomenologyNuclear Theorytext