Statistical hadronization model analysis of hadron yields in p plus Nb and Ar plus KCl at SIS18 energies

被引:41
作者
Agakishiev, G. [7 ]
Arnold, O. [9 ,10 ]
Balanda, A. [3 ]
Belver, D. [18 ]
Belyaev, A. [7 ]
Berger-Chen, J. C. [9 ,10 ]
Blanco, A. [2 ]
Boehmer, M. [10 ]
Boyard, J. L. [16 ]
Cabanelas, P. [18 ]
Castro, E. [18 ]
Chernenko, S. [7 ]
Destefanis, M. [11 ]
Dohrmann, F. [6 ]
Dybczak, A. [3 ]
Epple, E. [9 ,10 ]
Fabbietti, L. [9 ,10 ]
Fateev, O. [7 ]
Finocchiaro, P. [1 ]
Fonte, P. [2 ,22 ]
Friese, J. [10 ]
Froehlich, I. [8 ]
Galatyuk, T. [5 ,23 ]
Garzon, J. A. [18 ]
Gernhaeuser, R. [10 ]
Gilardi, C. [11 ]
Goebel, K. [8 ]
Golubeva, M. [13 ]
Gonzalez-Diaz, D. [5 ]
Guber, F. [13 ]
Gumberidze, M. [5 ,23 ]
Heinz, T. [4 ]
Hennino, T. [16 ]
Holzmann, R. [4 ]
Ierusalimov, A. [7 ]
Iori, I. [12 ,24 ]
Ivashkin, A. [13 ]
Jurkovic, M. [10 ]
Kaempfer, B. [6 ,25 ]
Karavicheva, T. [13 ]
Koenig, I. [4 ]
Koenig, W. [4 ]
Kolb, B. W. [4 ]
Kornakov, G. [5 ]
Kotte, R. [6 ]
Krasa, A. [17 ]
Krizek, F. [17 ]
Kruecken, R. [10 ]
Kuc, H. [3 ,16 ]
Kuehn, W. [11 ]
机构
[1] Ist Nazl Fis Nucl, Lab Nazl Sud, I-95125 Catania, Italy
[2] LIP Lab Instrumentacao & Fis Expt Particulas, P-3004516 Coimbra, Portugal
[3] Jagiellonian Univ Cracow, Smoluchowski Inst Phys, PL-30059 Krakow, Poland
[4] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany
[5] Tech Univ Darmstadt, D-64289 Darmstadt, Germany
[6] Helmholtz Zentrum Dresden Rossendorf, Inst Strahlenphys, D-01314 Dresden, Germany
[7] Joint Inst Nucl Res, Dubna 141980, Russia
[8] Goethe Univ Frankfurt, Inst Kernphys, D-60438 Frankfurt, Germany
[9] Excellence Cluster Origin & Struct Universe, D-85748 Garching, Germany
[10] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany
[11] Univ Giessen, Phys Inst 2, D-35392 Giessen, Germany
[12] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[13] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
[14] Inst Theoret & Expt Phys, Moscow 117218, Russia
[15] Univ Cyprus, Dept Phys, CY-1678 Nicosia, Cyprus
[16] Univ Paris 11, CNRS, IN2P3, Inst Phys Nucl,UMR 8608, F-91406 Orsay, France
[17] Acad Sci Czech Republ, Inst Nucl Phys, Rez 25068, Czech Republic
[18] Univ Santiago de Compostela, LabCAF F Fis, Santiago De Compostela 15706, Spain
[19] Lawrence Berkeley Natl Lab, Berkeley, CA USA
[20] Univ Torino, Dipartimento Fis, I-10125 Turin, Italy
[21] Univ Torino, Ist Nazl Fis Nucl, I-10125 Turin, Italy
[22] ISEC Coimbra, Coimbra, Portugal
[23] ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany
[24] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[25] Tech Univ Dresden, D-01062 Dresden, Germany
[26] Frederick Univ, CY-1036 Nicosia, Cyprus
关键词
HYPERON PRODUCTION; COLLECTIVE FLOW; SYSTEM-SIZE; COLLISIONS; DEPENDENCE; STRANGE;
D O I
10.1140/epja/i2016-16178-x
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The HADES data from p + Nb collisions at a center-of-mass energy of root s(NN) = 3.2 GeV are analyzed employing a statistical hadronization model. The model can successfully describe the production yields of the identified hadrons pi(0), eta, Lambda, K-s(0), omega with parameters T-chem = (99 +/- 11) MeV and mu(b) = (619 +/- 34) MeV, which fit well into the chemical freeze-out systematics found in heavy-ion collisions. In addition, we reanalyze our previous HADES data from Ar + KCl collisions at root s(NN) = 2.6 GeV with an updated version of the model. We address equilibration in heavy-ion collisions by testing two aspects: the description of yields and the regularity of freeze-out parameters from a statistical model fit as a function of colliding energy and system size. Despite its success, the model fails to describe the observed Xi(-) yields in both, p + Nb and Ar + KCl. Special emphasis is put on feed-down contributions from higher-lying resonance states as a possible explanation for the observed excess.
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页数:10
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