Observation of a Resonance-Like Structure in the Invariant Mass Spectrum of Two Photons from pC- and dC-INTERACTIONS

Details Observation of a Resonance-Like Structure in the Invariant Mass Spectrum of Two Photons from pC- and dC-INTERACTIONS Observation of a Resonance-Like Structure in the Invariant Mass Spectrum of Two Photons from pC- and dC-INTERACTIONS

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008vhmp.conf...70a&link_type=abstract

VERY HIGH MULTIPLICITY PHYSICS WORKSHOPS. Proceedings of the VHM Physics Workshops. Held 17-19 September 2007 in JINR, Dubna, Ru

Physics

Scientific paper

Along with π0 and η mesons, a resonance structure in the invariant mass spectrum of two γ-quanta at M = 360 ± 7 ± 9 MeV is first observed in the reaction dC → γ + γ + X at momentum 2.75 GeV/c per nucleon. Preliminary estimates of its width and cross section are Γ = 49.2 ± 18.6 MeV and σγγ ~ 98 μb. The collected statistics is 2339 ± 340 events of 1.5·106 triggered interactions of a total number of ~ 1012 dC-interactions. This structure is not observed in pC collisions at the beam momentum 5.5 GeV/c. Possible mechanisms of this ABC-like effect are discussed.

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