In-Medium Effects on K0 Mesons in Relativistic Heavy-Ion Collisions

G.Agakishiev , A.Balanda , B.Bannier , R.Bassini , D.Belver , A.V.Belyaev , A.Blanco , M.B\"ohmer

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J.L.Boyard P.Cabanelas E.Castro S.Chernenko T.Christ M.Destefanis J.D\'iaz F.Dohrmann A.Dybczak T.Eberl E. Epple L.Fabbietti O.V.Fateev P.Finocchiaro P.Fonte J.Friese I.Fr\"ohlich T.Galatyuk J.A.Garz\'on R.Gernh\"auser A.Gil C.Gilardi M.Golubeva D.Gonz\'alez-D\'iaz F.Guber M.Heilmann T.Heinz T.Hennino R.Holzmann A.Ierusalimov I.Iori A.Ivashkin M.Jurkovic B.K\"ampfer K.Kanaki T.Karavicheva D.Kirschner I.Koenig W.Koenig B.W.Kolb R.Kotte F.Krizek R.Kr\"ucken W.K\"uhn A.Kugler A.Kurepin S.Lang J.S.Lange K.Lapidus T.Liu L.Lopes M.Lorenz L.Maier A.Mangiarotti J.Markert V.Metag B.Michalska J.Michel D.Mishra E.Morini\`ere J.Mousa C.M\"untz L.Naumann J.Otwinowski Y.C.Pachmayer M.Palka Y.Parpottas V.Pechenov O.Pechenova T.P\'erezCavalcanti J.Pietraszko W.Przygoda B.Ramstein A.Reshetin M.Roy-Stephan A.Rustamov A.Sadovsky B.Sailer P.Salabura A.Schmah E.Schwab Yu.G.Sobolev S.Spataro B.Spruck H.Str\"obele J.Stroth C.Sturm M.Sudol A.Tarantola K.Teilab P.Tlusty M.Traxler R.Trebac H.Tsertos V.Wagner M.Weber M.Wisniowski T.Wojcik J.W\"ustenfel S.Yurevich Y.V.Zanevsky P.Zhou P.Zumbruch

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keywords in-mediumdistributionsmodelmomentumpotentialrapiditybeamcalculations

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We present the transverse momentum spectra and rapidity distributions of $\pi^{-}$ and K$^0_S$ in Ar+KCl reactions at a beam kinetic energy of 1.756 A GeV measured with the spectrometer HADES. The reconstructed K$^0_S$ sample is characterized by good event statistics for a wide range in momentum and rapidity. We compare the experimental $\pi^{-}$ and K$^0_S$ distributions to predictions by the IQMD model. The model calculations show that K$^0_S$ at low tranverse momenta constitute a particularly well suited tool to investigate the kaon in-medium potential. Our K$^0_S$ data suggest a strong repulsive in-medium K$^0$ potential of about 40 MeV strength.

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In-Medium Effects on K0 Mesons in Relativistic Heavy-Ion Collisions

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