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. Čaplar; N. Cindro; J. P. Coffin; P. Crochet; P. Dupieux; M. Dželalija; L. Fraysse; Z. Fodor; A. Genoux-Lubain; A. Gobbi; K. D. Hildenbrand; B. 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

doi:10.1007/s100500050188

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, B. 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

Department of Physics

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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 p_t 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 language	English
Pages (from-to)	335-349
Number of pages	15
Journal	European Physical Journal A
Volume	3
Issue number	4
DOIs	https://doi.org/10.1007/s100500050188
Publication status	Published - 1998

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/s100500050188

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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. https://doi.org/10.1007/s100500050188

Eskef, M, Pelte, D, Goebels, G, Häfele, E, Herrmann, N, Korolija, M, Leifels, Y, Merlitz, H, Mohren, S, Stockmeier, MR, Trzaska, M, Alard, JP, Andronic, A, Averbeck, R, Basrak, Z, Bastid, N, Belyaev, I, Best, D, Buta, A, Čaplar, R, Cindro, N, Coffin, JP, Crochet, P, Dupieux, P, Dželalija, M, Fraysse, L, Fodor, Z, Genoux-Lubain, A, Gobbi, A, Hildenbrand, KD, Hong, B, Jundt, F, Kecskemeti, J, Kirejczyk, M, Kotte, R, Kutsche, R, Lebedev, A, Manko, V, Mösner, J, Moisa, D, Neubert, W, Petrovici, M, Pinkenburg, C, Plettner, C, Pras, P, Rami, F, Ramillien, V, Reisdorf, W, Ritman, JL, De Schauenburg, B, Schüll, D, Seres, Z, Sikora, B, Simion, V, Siwek-Wilczynska, K, Smolyankin, V, Vasiliev, MA, Wagner, P, Wang, GS, Wisniewski, K, Wohlfarth, D & Zhilin, A 1998, 'Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV', European Physical Journal A, vol. 3, no. 4, pp. 335-349. https://doi.org/10.1007/s100500050188

@article{cfd3255bc3ec4e1d8bed22da5826bbf2,

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

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.",

author = "M. Eskef and D. Pelte and G. Goebels and E. H{\"a}fele and N. Herrmann and M. Korolija and Y. Leifels and H. Merlitz and S. Mohren and Stockmeier, {M. R.} and M. Trzaska and Alard, {J. P.} and A. Andronic and R. Averbeck and Z. Basrak and N. Bastid and I. Belyaev and D. Best and A. Buta and R. {\v C}aplar and N. Cindro and Coffin, {J. P.} and P. Crochet and P. Dupieux and M. D{\v z}elalija and L. Fraysse and Z. Fodor and A. Genoux-Lubain and A. Gobbi and Hildenbrand, {K. D.} and B. Hong and F. Jundt and J. Kecskemeti and M. Kirejczyk and R. Kotte and R. Kutsche and A. Lebedev and V. Manko and J. M{\"o}sner and D. Moisa and W. Neubert and M. Petrovici and C. Pinkenburg and C. Plettner and P. Pras and F. Rami and V. Ramillien and W. Reisdorf and Ritman, {J. L.} and {De Schauenburg}, B. and D. Sch{\"u}ll and Z. Seres and B. Sikora and V. Simion and K. Siwek-Wilczynska and V. Smolyankin and Vasiliev, {M. A.} and P. Wagner and Wang, {G. S.} and K. Wisniewski and D. Wohlfarth and A. Zhilin",

year = "1998",

doi = "10.1007/s100500050188",

language = "English",

volume = "3",

pages = "335--349",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "4",

}

TY - JOUR

T1 - Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV

AU - Eskef, M.

AU - Pelte, D.

AU - Goebels, G.

AU - Häfele, E.

AU - Herrmann, N.

AU - Korolija, M.

AU - Leifels, Y.

AU - Merlitz, H.

AU - Mohren, S.

AU - Stockmeier, M. R.

AU - Trzaska, M.

AU - Alard, J. P.

AU - Andronic, A.

AU - Averbeck, R.

AU - Basrak, Z.

AU - Bastid, N.

AU - Belyaev, I.

AU - Best, D.

AU - Buta, A.

AU - Čaplar, R.

AU - Cindro, N.

AU - Coffin, J. P.

AU - Crochet, P.

AU - Dupieux, P.

AU - Dželalija, M.

AU - Fraysse, L.

AU - Fodor, Z.

AU - Genoux-Lubain, A.

AU - Gobbi, A.

AU - Hildenbrand, K. D.

AU - Hong, B.

AU - Jundt, F.

AU - Kecskemeti, J.

AU - Kirejczyk, M.

AU - Kotte, R.

AU - Kutsche, R.

AU - Lebedev, A.

AU - Manko, V.

AU - Mösner, J.

AU - Moisa, D.

AU - Neubert, W.

AU - Petrovici, M.

AU - Pinkenburg, C.

AU - Plettner, C.

AU - Pras, P.

AU - Rami, F.

AU - Ramillien, V.

AU - Reisdorf, W.

AU - Ritman, J. L.

AU - De Schauenburg, B.

AU - Schüll, D.

AU - Seres, Z.

AU - Sikora, B.

AU - Simion, V.

AU - Siwek-Wilczynska, K.

AU - Smolyankin, V.

AU - Vasiliev, M. A.

AU - Wagner, P.

AU - Wang, G. S.

AU - Wisniewski, K.

AU - Wohlfarth, D.

AU - Zhilin, A.

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=11544310300&partnerID=8YFLogxK

U2 - 10.1007/s100500050188

DO - 10.1007/s100500050188

M3 - Article

AN - SCOPUS:11544310300

SN - 1434-6001

VL - 3

SP - 335

EP - 349

JO - European Physical Journal A

JF - European Physical Journal A

IS - 4

ER -

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

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