Invariant mass analyses of (p, pi(+/-)) pairs in Ni-58 + Cu collisions at 1.97A GeV have been performed and show correlations resulting from the decays of the Delta resonance, the Lambda baryon, and possibly the N*(1440) resonance. A reduction in the Delta 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 Delta production mechanisms in heavy ion collisions.
Invariant mass analyses of (p, pi(+/-)) pairs in Ni-58 + Cu collisions at 1.97A GeV have been performed and show correlations resulting from the decays of the Delta resonance, the Lambda baryon, and possibly the N*(1440) resonance. A reduction in the Delta 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 Delta production mechanisms in heavy ion collisions.
Delta resonance production in Ni-58+Cu collisions at E=1.97A GeV
ALBERGO, Sebastiano Francesco;COSTA, Salvatore;INSOLIA, Antonio;TUVE', Cristina Natalina;
1997-01-01
Abstract
Invariant mass analyses of (p, pi(+/-)) pairs in Ni-58 + Cu collisions at 1.97A GeV have been performed and show correlations resulting from the decays of the Delta resonance, the Lambda baryon, and possibly the N*(1440) resonance. A reduction in the Delta 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 Delta production mechanisms in heavy ion collisions.| File | Dimensione | Formato | |
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PRL 79(1997)4345-4348.pdf
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