https://doi.org/10.1140/epja/i2011-11021-8
Regular Article - Experimental Physics
Hyperon production in Ar + KCl collisions at 1.76A GeV
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
We present transverse momentum spectra, rapidity distribution and multiplicity of -hyperons measured with the HADES spectrometer in the reaction Ar(1.76AGeV) + KCl . The yield of
is calculated from our previously reported
/(
+
) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured
-hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of
, K+, K
0
s , K-,
,
and
. 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.
© SIF, Springer-Verlag Berlin Heidelberg, 2011