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arXiv · 1010.1675

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. Diaz·F. Dohrmann·A. Dybczak·T. Eberl·E. Epple·L. Fabbietti·O. Fateev·P. Finocchiaro·P. Fonte·J. Friese·I. Froehlich·T. Galatyuk·J. A. Garzon·R. Gernhaeuser·A. Gil·C. Gilardi·M. Golubeva·D. Gonzalez-Diaz·F. Guber·M. Gumberidze·M. Heilmann·T. Heinz·T. Hennino·R. Holzmann·P. Huck·I. Iori·A. Ivashkin·M. Jurkovic·B. Kaempfer·K. Kanaki·T. Karavicheva·D. Kirschner·I. Koenig·W. Koenig·B. W. Kolb·R. Kotte·F. Krizek·R. Kruecken·W. Kuehn·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. Moriniere·J. Mousa·C. Muentz·L. Naumann·J. Otwinowski·Y. C. Pachmayer·M. Palka·Y. Parpottas·V. Pechenov·O. Pechenova·T. Perez-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. Stroebele·J. Stroth·C. Sturm·A. Tarantola·K. Teilab·P. Tlusty
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Abstract

We present transverse momentum spectra, rapidity distribution and multiplicity of Lambda-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV)+KCl. The yield of Xi- is calculated from our previously reported Xi-/(Lambda+Sigma0) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured charged Sigma hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of pi-, K+, K0s, 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 particles.

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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. Diaz, F. Dohrmann, A. Dybczak, T. Eberl, E. Epple, L. Fabbietti, O. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Froehlich, T. Galatyuk, J. A. Garzon, R. Gernhaeuser, A. Gil, C. Gilardi, M. Golubeva, D. Gonzalez-Diaz, F. Guber, M. Gumberidze, M. Heilmann, T. Heinz, T. Hennino, R. Holzmann, P. Huck, I. Iori, A. Ivashkin, M. Jurkovic, B. Kaempfer, K. Kanaki, T. Karavicheva, D. Kirschner, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, F. Krizek, R. Kruecken, W. Kuehn, 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. Moriniere, J. Mousa, C. Muentz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, T. Perez-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. Stroebele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty. 2010-10-08. Hyperon production in Ar+KCl collisions at 1.76A GeV. https://doi.org/10.1140/epja/i2011-11021-8

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