Observation of New Resonance Structure in the Invariant Mass Spectrum of Two gamma-Quanta in dC-Interactions at Momentum 2.75 GeV/c per Nucleon
Abstract
A new resonance structure at M = 355 6 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 12 MeV and sigmagamma-gamma = 0.6 mkb. The collected statistics is 2680 310 events of 1.5 106 triggered interactions of a total number 3 1012 dC-interactions.
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