|
Deep sub-threshold $\Xi^-$ production in Ar+KCl reactions at 1.76A GeV (2009) |
- Agakishiev, G.,
- Balanda, A.,
- Bassini, R.,
- Belver, D.,
- Belyaev, A. V.,
- Blanco, A.,
- Böhmer, M.,
- Boyard, J. L.,
- Braun-Munzinger, P.,
- Cabanelas, P.,
- Castro, E.,
- Chernenko, S.,
- Christ, T.,
- Destefanis, M.,
- Díaz, J.,
- Dohrmann, F.,
- Dybczak, A.,
- Eberl, T.,
- 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.,
- Hennino, T.,
- Holzmann, R.,
- 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.,
- Krücken, R.,
- 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, Y.,
- Pechenov, V.,
- Pechenova, O.,
- Pietraszko, J.,
- Przygoda, W.,
- Ramstein, B.,
- Reshetin, A.,
- Roy-Stephan, M.,
- Rustamov, A.,
- Sadovsky, A.,
- Sailer, B.,
- Salabura, P.,
- Schmah, A.,
- Sobolev, Yu. G.,
- Spataro, S.,
- Spruck, B.,
- Ströbele, H.,
- Stroth, J.,
- Sturm, C.,
- Sudol, M.,
- Tarantola, A.,
- Teilab, K.,
- Tlusty, P.,
- Traxler, M.,
- Trebacz, R.,
- Tsertos, H.,
- Wagner, V.,
- Weber, M.,
- Wisniowski, M.,
- Wojcik, T.,
- Wüstenfeld, J.,
- Yurevich, S.,
- Zanevsky, Y. V.,
- Zhou, P.
|
Abstract |
|
We report first results on a deep sub-threshold production of the doubly strange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of the decay channel $\Xi^- \to \Lambda \pi^-$. The deduced $\Xi^-/(\Lambda+\Sigma^0)$ production ratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly larger than available model predictions..
Comment: 4 pages, including 4 figures |
Details der Publikation |
|