Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV

M. Eskef, D. Pelte, G. Goebels, E. Häfele, N. Herrmann, M. Korolija, Y. Leifels, H. Merlitz, S. Mohren, M. R. Stockmeier, M. Trzaska, J. P. Alard, A. Andronic, R. Averbeck, Z. Basrak, N. Bastid, I. Belyaev, D. Best, A. Buta, R. ČaplarN. Cindro, J. P. Coffin, P. Crochet, P. Dupieux, M. Dželalija, L. Fraysse, Z. Fodor, A. Genoux-Lubain, A. Gobbi, K. D. Hildenbrand, Byungsik Hong, F. Jundt, J. Kecskemeti, M. Kirejczyk, R. Kotte, R. Kutsche, A. Lebedev, V. Manko, J. Mösner, D. Moisa, W. Neubert, M. Petrovici, C. Pinkenburg, C. Plettner, P. Pras, F. Rami, V. Ramillien, W. Reisdorf, J. L. Ritman, B. De Schauenburg, D. Schüll, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczynska, V. Smolyankin, M. A. Vasiliev, P. Wagner, G. S. Wang, K. Wisniewski, D. Wohlfarth, A. Zhilin

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Abstract

The mass distributions of baryon resonances populated in near-central collisions of Au on Au and Ni on Ni are deduced by defolding the pt spectra of charged pions by a method which does not depend on a specific resonance shape. In addition the mass distributions of resonances are obtained from the invariant masses of (p,π±) pairs. With both methods the deduced mass distributions are shifted by an average value of -60 MeV/c2 relative to the mass distribution of the free Δ(1232) resonance, the distributions descent almost exponentially towards mass values of 2000 MeV/c2. The observed differences between (p,π-) and (p,π+) pairs indicate a contribution of isospin I = 1/2 resonances. The attempt to consistently describe the deduced mass distributions and the reconstructed kinetic energy spectra of the resonances leads to new insights about the freeze out conditions, i.e. to rather low temperatures and large expansion velocities.

Original languageEnglish
Pages (from-to)335-349
Number of pages15
JournalEuropean Physical Journal A
Volume3
Issue number4
Publication statusPublished - 1998 Dec 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Eskef, M., Pelte, D., Goebels, G., Häfele, E., Herrmann, N., Korolija, M., Leifels, Y., Merlitz, H., Mohren, S., Stockmeier, M. R., Trzaska, M., Alard, J. P., Andronic, A., Averbeck, R., Basrak, Z., Bastid, N., Belyaev, I., Best, D., Buta, A., ... Zhilin, A. (1998). Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV. European Physical Journal A, 3(4), 335-349.