Strangeness measurements at the HADES experiment

Agakishiev, G.; Balanda, A.; Belver, D.; Belyaev, A.; Blanco, A.; B¨ohmer, M.; Boyard, J. L.; Cabanelas, P.; Castro, E.; Chernenko, S.; D´ıaz, J.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Fonte, P.; Friese, J.; Fr¨ohlich, I.; Galatyuk, T.; Garz´on, J. A.; Gil, A.; Golubeva, M.; Gonz´alez D´ıaz, D.; Guber, F.; Hennino, T.; Holzmann, R.; Huck, P.; Ierusalimov, A.; Iori, I.; Ivashkin, A.; Jurkovic, M.; K¨ampfer, B.; Karavicheva, T.; Koenig, I.; Koenig, W.; Kolb, B. W.; Kopp, A.; Korcyl, G.; Kornakov, G. K.; Kotte, R.; Kozuch, A.; Kr´asa, A.; Krizek, F.; Kr¨ucken, R.; Kuc, H.; K¨uhn, W.; Kugler, A.; Kurepin, A.; Kurilkin, A.; Kurilkin, P.; Kã¤hlitz, P.; Ladygin, V.; Lamas Valverde, J.; Lang, S.; Lapidus, K.; Liu, T.; Lopes, L.; Lorenz, M.; Maier, L.; Mangiarotti, A.; Markert, J.; Metag, V.; Michalska, B.; Michel, J.; M¨untz, C.; Naumann, L.; Pachmayer, Y. C.; Palka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Roskoss, J.; Rustamov, A.; Sadovsky, A.; Salabura, P.; Schmah, A.; Siebenson, J.; Sobolev, Yu G.; Spataro, STEFANO GIOVANNI; Str¨obele, H.; Stroth, J.; Sturm, C.; Sudol, M.; Tarantola, A.; Teilab, K.; Tlusty, P.; Traxler, M.; Trebacz, R.; Tsertos, H.; Vasiliev, T.; Wagner, V.; Weber, M.; W¨ ustenfeld, J.; Yurevich, S.; Zanevsky, Y.

doi:10.1088/0954-3899/37/9/094004

We report on high acceptance di-electron spectrometer (HADES) measurements of strange hadrons in the collision systems Ar(1.756 AGeV)+KCl and p+p at 3.5 GeV. Comparisons of K0 s transverse mass and rapidity spectra to IQMD transport model calculations give a strong hint to a repulsive kaon–nucleon potential. The effect of the potential shows up strongest at very low transverse momenta, which were measured by HADES with high statistics. Statistical model fits show a fair agreement to the particle yields measured in the heavy-ion data, apart from the Xi− yield which is off by more than an order of magnitude. Furthermore, first results from the Sigma(138 )+ reconstruction in p+p reactions are presented, showing an excellent agreement with published data.