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

G. Agakishiev; O. Arnold; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; M. Destefanis; F. Dohrmann; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; C. Gilardi; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb; G. Kornakov; R. Kotte; A. Krása; F. Krizek; R. Krücken; H. Kuc; W. Kühn; A. Kugler; A. Kurepin; V. Ladygin; R. Lalik; J. S. Lange; S. Lang; K. Lapidus; A. Lebedev; T. Liu; L. Lopes; M. Lorenz; L. Maier; A. Mangiarotti; J. Markert; V. Metag; B. Michalska; D. Mihaylov; J. Michel; E. Morinière; J. Mousa; C. Müntz; R. Münzer; L. Naumann; Y. C. Pachmayer; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; J. Pietraszko; W. Przygoda; B. Ramstein; L. Rehnisch; A. Reshetin; A. Rustamov; A. Sadovsky; P. Salabura; T. Scheib; A. Schmah; H. Schuldes; E. Schwab; J. Siebenson; Yu. G. Sobolev; S. Spataro; B. Spruck; H. Ströbele; J. Stroth; C. Sturm; A. Tarantola; K. Teilab; P. Tlusty; M. Traxler; R. Trebacz; H. Tsertos; T. Vasiliev; V. Wagner; M. Weber; C. Wendisch; J. Wirth; M. Wisniowski; J. Wüstenfeld; S. Yurevich; Y. Zanevsky

doi:10.1140/epja/i2016-16178-x

2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2016) 52: 178
https://doi.org/10.1140/epja/i2016-16178-x

Regular Article - Experimental Physics

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

HADES Collaboration
G. Agakishiev⁷, O. Arnold¹⁰^,9, A. Balanda³, D. Belver¹⁸, A. Belyaev⁷, J. C. Berger-Chen¹⁰^,9, A. Blanco², M. Böhmer¹⁰, J. L. Boyard¹⁶, P. Cabanelas¹⁸, E. Castro¹⁸, S. Chernenko⁷, M. Destefanis¹¹, F. Dohrmann⁶, A. Dybczak³, E. Epple¹⁰^,9, L. Fabbietti¹⁰^,9, O. Fateev⁷, P. Finocchiaro¹, P. Fonte², J. Friese¹⁰, I. Fröhlich⁸, T. Galatyuk⁵, J. A. Garzón¹⁸, R. Gernhäuser¹⁰, C. Gilardi¹¹, K. Göbel⁸, M. Golubeva¹³, D. González-Díaz⁵, F. Guber¹³, M. Gumberidze⁵, T. Heinz⁴, T. Hennino¹⁶, R. Holzmann⁴, A. Ierusalimov⁷, I. Iori¹², A. Ivashkin¹³, M. Jurkovic¹⁰, B. Kämpfer⁶, T. Karavicheva¹³, I. Koenig⁴, W. Koenig⁴, B. W. Kolb⁴, G. Kornakov⁵, R. Kotte⁶, A. Krása¹⁷, F. Krizek¹⁷, R. Krücken¹⁰, H. Kuc³^,16, W. Kühn¹¹, A. Kugler¹⁷, A. Kurepin¹³, V. Ladygin⁷, R. Lalik¹⁰^,9, J. S. Lange¹¹, S. Lang⁴, K. Lapidus¹⁰^,9, A. Lebedev¹⁴, T. Liu¹⁶, L. Lopes², M. Lorenz⁸^*, L. Maier¹⁰, A. Mangiarotti², J. Markert⁸, V. Metag¹¹, B. Michalska³, D. Mihaylov¹⁰^,9, J. Michel⁸, E. Morinière¹⁶, J. Mousa¹⁵, C. Müntz⁸, R. Münzer¹⁰^,9, L. Naumann⁶, Y. C. Pachmayer⁸, M. Palka³, Y. Parpottas¹⁵, V. Pechenov⁴, O. Pechenova⁸, J. Pietraszko⁴, W. Przygoda³, B. Ramstein¹⁶, L. Rehnisch⁸, A. Reshetin¹³, A. Rustamov⁸, A. Sadovsky¹³, P. Salabura³, T. Scheib⁸, A. Schmah¹⁹, H. Schuldes⁸, E. Schwab⁴, J. Siebenson¹⁰, Yu. G. Sobolev¹⁷, S. Spataro²⁰, B. Spruck¹¹, H. Ströbele⁸, J. Stroth⁸^,4, C. Sturm⁴, A. Tarantola⁸, K. Teilab⁸, P. Tlusty¹⁷, M. Traxler⁴, R. Trebacz³, H. Tsertos¹⁵, T. Vasiliev⁷, V. Wagner¹⁷, M. Weber¹⁰, C. Wendisch⁴, J. Wirth¹⁰^,9, M. Wisniowski³, J. Wüstenfeld⁶, S. Yurevich⁴ and Y. Zanevsky⁷

¹ INFN - Laboratori Nazionali del Sud, 95125, Catania, Italy
² LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516, Coimbra, Portugal
³ Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059, Kraków, Poland
⁴ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
⁵ Technische Universität Darmstadt, 64289, Darmstadt, Germany
⁶ Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314, Dresden, Germany
⁷ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁸ Institut für Kernphysik, Goethe-Universität, 60438, Frankfurt, Germany
⁹ Excellence Cluster “Origin and Structure of the Universe”, 85748, Garching, Germany
¹⁰ Physik Department E12, Technische Universität München, 85748, Garching, Germany
¹¹ II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392, Giessen, Germany
¹² Sezione di Milano, INFN, 20133, Milano, Italy
¹³ Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
¹⁴ Institute of Theoretical and Experimental Physics, 117218, Moscow, Russia
¹⁵ Department of Physics, University of Cyprus, 1678, Nicosia, Cyprus
¹⁶ Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 - Université Paris Sud, F-91406, Orsay Cedex, France
¹⁷ Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068, Rez, Czech Republic
¹⁸ LabCAF. F. Física, Univ. de Santiago de Compostela, 15706, Santiago de Compostela, Spain
¹⁹ Lawrence Berkeley National Laboratory, Berkeley, USA
²⁰ Dipartimento di Fisica and INFN, Università di Torino, 10125, Torino, Italy

^* e-mail: m.lorenz@gsi.de

Received: 22 December 2015
Revised: 15 April 2016
Accepted: 11 May 2016
Published online: 28 June 2016

Abstract

The HADES data from p + Nb collisions at a center-of-mass energy of $\sqrt{s_{NN}} = 3.2$ 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 ⁰ _s, $\omega$ with parameters $T_{chem} = (99\pm 11)$ MeV and $\mu_{b} = (619\pm 34)$ 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 $\sqrt{s_{NN}} = 2.6$ 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.