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Delta resonance production in Ni-58 + Cu collisions at E = 1.97-A-GeV

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Publication Date
Identifiers
DOI: 10.1103/PhysRevLett.79.4345
OAI: oai:inspirehep.net:452723
Source
INSPIRE-HEP
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Abstract

Invariant mass analyses of (p,π±) pairs in 58Ni+Cu collisions at 1.97AGeV have been performed and show correlations resulting from the decays of the Δ resonance, the Λ baryon, and possibly the N*(1440) resonance. A reduction in the Δ mass is observed and the mass reduction increases with collision centrality. Events generated by the relativistic cascade model (ARC) also reveal a mass reduction. The mass reduction is related to the size of the reaction volume and the details of Δ production mechanisms in heavy ion collisions.

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