期刊
EUROPEAN PHYSICAL JOURNAL A
卷 47, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2011-11021-8
关键词
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资金
- BMBF (Germany) [06MT9156, 06GI146I, 06FY171, 06DR9059D]
- GSI [TMKrue 1012, GI /ME3, OF/STR]
- Excellence Cluster Universe (Germany)
- GA AS CR [IAA100480803]
- MSMT (Czech Republic) [LC 07050]
- INFN (Italy)
- CNRS/IN2P3 (France)
- Spain [MCYT FPA2000-2041-C02-02, XUGA PGID FPA2009-12931 T02PXIC20605PN]
- Cyprus [UCY-10.3.11.12]
- INTAS [06-1000012-8861]
- EU [RII3-CT-506078]
- [KBN5P03B 140 20]
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+Sigma(0)) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured Sigma(+/-)-hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of pi(-), K+, K-s(0), 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.
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