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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Deep sub-threshold K*(892)(0) production in collisions of Ar + KCl at 1.76A GeV Tvůrce(i) 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, SAICelkový počet autorů 103 Zdroj.dok. European Physical Journal A. - : Springer - ISSN 1434-6001
Roč. 49, č. 3 (2013), s. 34Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova HADES ; sub-treshold production Vědní obor RIV BG - Jaderná, atomová a mol. fyzika, urychlovače CEP LC07050 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy IAA100480803 GA AV ČR - Akademie věd Institucionální podpora UJF-V - RVO:61389005 UT WOS 000317855000006 DOI 10.1140/epja/i2013-13034-7 Anotace 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-K*0 = (4.4 +/- 1.1 +/- 0.5) x 10(-4) and the K*(892)(0)/K-0 ratio of P-K*0/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. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2014
Počet záznamů: 1