Deep sub-threshold K*(892)(0) production in collisions of Ar + KCl at 1.76A GeV

Agakishiev, G.; Balanda, A.; Bassini, R.; Belver, D.; Belyaev, A. V.; Blanco, A.; Böhmer, M.; Boyard, J. L.; Cabanelas, P.; Castro, E.; Chernenko, S.; Christ, T.; Destefanis, M.; Díaz, J.; Dohrmann, F.; Křížek, Filip; Kugler, Andrej; Sobolev, Yuri, G.; Tlustý, Pavel; Wagner, Vladimír

doi:https://dx.doi.org/10.1140/epja/i2013-13034-7

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Deep sub-threshold K*(892)(0) production in collisions of Ar + KCl at 1.76A GeV

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SYSNO ASEP	0392915
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Deep sub-threshold K*(892)(0) production in collisions of Ar + KCl at 1.76A GeV
Author(s)	Agakishiev, G. (DE) Balanda, A. (PL) Bassini, R. (IT) Belver, D. (ES) Belyaev, A. V. (RU) Blanco, A. (PT) Böhmer, M. (DE) Boyard, J. L. (FR) Cabanelas, P. (ES) Castro, E. (ES) Chernenko, S. (RU) Christ, T. (DE) Destefanis, M. (DE) Díaz, J. (ES) Dohrmann, F. (DE) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kugler, Andrej (UJF-V)_{RID, ORCID, SAI} Sobolev, Yuri, G. (UJF-V)_ORCID Tlustý, Pavel (UJF-V)_{ORCID, SAI} Wagner, Vladimír (UJF-V)_{RID, ORCID, SAI}
Number of authors	103
Source Title	European Physical Journal A. - : Springer - ISSN 1434-6001 Roč. 49, č. 3 (2013), s. 34
Number of pages	7 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	HADES ; sub-treshold production
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
R&D Projects	LC07050 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	IAA100480803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
Institutional support	UJF-V - RVO:61389005
UT WOS	000317855000006
DOI	10.1140/epja/i2013-13034-7
Annotation	Results on the deep sub-threshold production of the short-lived hadronic resonance K(892)(0) are reported for collisions of Ar + KCl at 1.76 A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The K(892)(0) production probability per central collision of P-K0 = (4.4 +/- 1.1 +/- 0.5) x 10(-4) and the K(892)(0)/K-0 ratio of P-K0/P-K0 = (1.9 +/- 0.5 +/- 0.3) x 10(-2) are determined at the lowest energy so far (i.e. deep below the threshold for the corresponding production in nucleon-nucleon collisions, root s(NN)-root s(thr) = -340MeV). The K(0)/K-0 ratio is compared with results of other experiments and with the predictions of the UrQMD transport approach and of the statistical hadronization model. The experimental K(0) yield and the K-0/K-0 ratio are overestimated by the transport model by factors of about five and two, respectively. In a chemically equilibrated medium the ratio corresponds to a temperature of the thermalized system being systematically lower than the value determined by the yields of the stable and long-lived hadrons produced in Ar + KCl collisions. From the present measurement, we conclude that sub-threshold K* production either cannot be considered to proceed in a system being in thermal equilibrium or these short-lived resonances appear undersaturated, for example as a result of the rescattering of the decay particles in the ambient hadronic medium.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2014

Number of the records: 1