Deep sub-threshold K*(892)0 production in collisions of Ar + KCl at 1.76A GeV
Date
2013Author
Krücken, R.Agakishiev, G.
Bałanda, A.
Bassini, R.
Belver, D.
Belyaev, A. V.
Blanco, A.
Böhmer, M.
Boyard, J. L.
Cabanelas, Pablo
Castro, E.
Chernenko, S.
Christ, T.
Destefanis, M.
Diáz, J.
Dohrmann, F.
Dybczak, A.
Eberl, T.
Epple, E.
Fabbietti, L.
Fateev, O. V.
Finocchiaro, P.
Fonte, P.
Friese, J.
Fröhlich, I.
Galatyuk, T.
Garzón, J. A.
Gernhäuser, R.
Gil, A.
Gilardi, C.
Golubeva, M.
González-Díaz, D.
Guber, F.
Gumberidze, M.
Heilmann, M.
Heinz, T.
Hennino, T.
Holzmann, R.
Huck, P.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kämpfer, B.
Kanaki, K.
Karavicheva, T.
Kirschner, D.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kotte, R.
Krizek, F.
Kühn, W.
Kugler, A.
Kurepin, A.
Lang, S.
Lange, J. S.
Lapidus, K.
Liu, T.
Lopes, L.
Lorenz, M.
Maier, L.
Mangiarotti, A.
Markert, J.
Metag, V.
Michalska, B.
Michel, J.
Mishra, D.
Morinière, E.
Mousa, J.
Müntz, C.
Naumann, L.
Otwinowski, J.
Pachmayer, Y. C.
Palka, M.
Parpottas, Yiannis
Pechenov, V.
Pechenova, O.
Pérez Cavalcanti, T.
Pietraszko, J.
Przygoda, W.
Ramstein, B.
Reshetin, A.
Roy-Stephan, M.
Rustamov, A.
Sadovsky, A.
Sailer, B.
Salabura, P.
Schmah, A.
Schwab, E.
Siebenson, J.
Sobolev, Y. G.
Spataro, S.
Spruck, B.
Ströbele, H.
Stroth, J.
Sturm, C.
Tarantola, A.
Teilab, K.
Tlusty, P.
Traxler, M.
Trebacz, R.
Tsertos, Haralambos
Wagner, V.
Weber, M.
Wendisch, C.
Wisniowski, M.
Wojcik, T.
Wüstenfeld, J.
Yurevich, S.
Zanevsky, Y. V.
Zumbruch, P.
ISSN
1434-6001Source
European Physical Journal AVolume
49Issue
3Google Scholar check
Metadata
Show full item recordAbstract
Results on the deep sub-threshold production of the short-lived hadronic resonance K*(892)0 are reported for collisions of Ar + KCl at 1.76A 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 PK*0 = (4.4 ± 1.1 ± 0.5) × 10-4 and the K*(892)0/K0 ratio of PK*0/PK0 = (1.9 ± 0.5 ± 0.3) × 10-2 are determined at the lowest energy so far (i.e. deep below the threshold for the corresponding production in nucleon-nucleon collisions, (Formula presented) = —340MeV). The K*0/K0 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/K0 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. © The Author(s) 2013.