Hyperon production in Ar + KCl collisions at 1.76A GeV

G. Agakishiev; A. Balanda; B. Bannier; R. Bassini; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J.L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Dıaz; F. Dohrmann; A. Dybczak; T. Eberl; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J.A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; M. Golubeva; D. González-Dıaz; F. Guber; M. Gumberidze; M. Heilmann; T. Heinz; T. Hennino; R. Holzmann; P. Huck; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K. Kanaki; T. Karavicheva; D. Kirschner; I. Koenig; W. Koenig; B.W. Kolb; R. Kotte; F. Krizek; R. Krücken; W. Kühn; A. Kugler; A. Kurepin; S. Lang; J.S. Lange; K. Lapidus; T. Liu; L. Lopes; M. Lorenz; L. Maier; A. Mangiarotti; J. Markert; V. Metag; B. Michalska; J. Michel; D. Mishra; E. Morinière; J. Mousa; C. Müntz; L. Naumann; J. Otwinowski; Y.C. Pachmayer; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; T. Pérez Cavalcanti; J. Pietraszko; W. Przygoda; B. Ramstein; A. Reshetin; M. Roy-Stephan; A. Rustamov; A. Sadovsky; B. Sailer; P. Salabura; A. Schmah; 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; V. Wagner; M. Weber; C. Wendisch; M. Wisniowski; T. Wojcik; J. Wüstenfeld; S. Yurevich; Y. Zanevsky; P. Zhou; P. Zumbruch

doi:10.1140/epja/i2011-11021-8

2023 Impact factor 2.6

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2011) 47: 21
https://doi.org/10.1140/epja/i2011-11021-8

Regular Article - Experimental Physics

Hyperon production in Ar + KCl collisions at 1.76A GeV

The HADES Collaboration
G. Agakishiev⁶, A. Balanda³, B. Bannier⁵, R. Bassini⁹, D. Belver¹⁶, A. Belyaev⁶, A. Blanco², M. Böhmer¹², J.L. Boyard¹⁴, P. Cabanelas¹⁶, E. Castro¹⁶, S. Chernenko⁶, T. Christ¹², M. Destefanis⁸, J. Dıaz¹⁷, F. Dohrmann⁵, A. Dybczak³, T. Eberl¹², E. Epple¹¹, L. Fabbietti¹¹, O. Fateev⁶, P. Finocchiaro¹, P. Fonte², J. Friese¹², I. Fröhlich⁷, T. Galatyuk⁷, J.A. Garzón¹⁶, R. Gernhäuser¹², A. Gil¹⁷, C. Gilardi⁸, M. Golubeva¹⁰, D. González-Dıaz⁴, F. Guber¹⁰, M. Gumberidze¹⁴, M. Heilmann⁷, T. Heinz⁴, T. Hennino¹⁴, R. Holzmann⁴, P. Huck¹², I. Iori⁹, A. Ivashkin¹⁰, M. Jurkovic¹², B. Kämpfer⁵, K. Kanaki⁵, T. Karavicheva¹⁰, D. Kirschner⁸, I. Koenig⁴, W. Koenig⁴, B.W. Kolb⁴, R. Kotte⁵, F. Krizek¹⁵, R. Krücken¹², W. Kühn⁸, A. Kugler¹⁵, A. Kurepin¹⁰, S. Lang⁴, J.S. Lange⁸, K. Lapidus¹¹, T. Liu¹⁴, L. Lopes², M. Lorenz⁷^*, L. Maier¹², A. Mangiarotti², J. Markert⁷, V. Metag⁸, B. Michalska³, J. Michel⁷, D. Mishra⁸, E. Morinière¹⁴, J. Mousa¹³, C. Müntz⁷, L. Naumann⁵, J. Otwinowski³, Y.C. Pachmayer⁷, M. Palka⁷, Y. Parpottas¹³, V. Pechenov⁴, O. Pechenova⁷, T. Pérez Cavalcanti⁸, J. Pietraszko⁷, W. Przygoda³, B. Ramstein¹⁴, A. Reshetin¹⁰, M. Roy-Stephan¹⁴, A. Rustamov⁴, A. Sadovsky¹⁰, B. Sailer¹², P. Salabura³, A. Schmah⁴, E. Schwab⁴, J. Siebenson¹¹, Yu.G. Sobolev¹⁵, S. Spataro⁸, B. Spruck⁸, H. Ströbele⁷, J. Stroth⁷^,4, C. Sturm⁴, A. Tarantola⁷, K. Teilab⁷, P. Tlusty¹⁵, M. Traxler⁴, R. Trebacz³, H. Tsertos¹³, V. Wagner¹⁵, M. Weber¹², C. Wendisch⁵, M. Wisniowski³, T. Wojcik³, J. Wüstenfeld⁵, S. Yurevich⁴, Y. Zanevsky⁶, P. Zhou⁵ and P. Zumbruch⁴

¹ Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, 95125, Catania, Italy
² LIP-Laboratório de Instrumentação e Fısica Experimental de Partıculas, 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 Forschungszentrum Dresden-Rossendorf, Institut für Strahlenphysik, 01314, Dresden, Germany
⁶ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁷ Institut für Kernphysik, Goethe-Universität, 60438, Frankfurt, Germany
⁸ II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392, Giessen, Germany
⁹ Istituto Nazionale di Fisica Nucleare, Sezione di Milano, 20133, Milano, Italy
¹⁰ Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
¹¹ Excellence Cluster “Origin and Structure of the Universe”, 85478, Munich, Germany
¹² Physik Department E12, Technische Universität München, 85748, München, Germany
¹³ Department of Physics, University of Cyprus, 1678, Nicosia, Cyprus
¹⁴ Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3, Université Paris Sud, F-91406, Orsay Cedex, France
¹⁵ Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068, Rez, Czech Republic
¹⁶ Departamento de Fısica de Partıculas, Universidad de Santiago de Compostela, 15706, Santiago de Compostela, Spain
¹⁷ Instituto de Fısica Corpuscular, Universidad de Valencia-CSIC, 46971, Valencia, Spain

^* e-mail: Lorenz@Physik.uni-frankfurt.de

Received: 8 October 2010
Accepted: 20 January 2011
Published online: 10 February 2011

Abstract

We present transverse momentum spectra, rapidity distribution and multiplicity of $\Lambda$ -hyperons measured with the HADES spectrometer in the reaction Ar(1.76AGeV) + KCl . The yield of $\Xi^{{-}}_{}$ is calculated from our previously reported $\Xi^{{-}}_{}$ /( $\Lambda$ + $\Sigma^{{0}}_{}$ ) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured $\Sigma^{{\pm}}_{}$ -hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of $\pi^{-}_{}$ , K⁺, K ⁰ _s , K^-, $\phi$ , $\Lambda$ and $\Xi^{-}_{}$ . The resulting chemical freeze-out temperature of T = (76±2) MeV is compared to the measured slope parameters obtained from fits to the transverse mass distributions of the different particles.