Sub-threshold production of Ks0 mesons and Λ hyperons in Au+Au collisions at sNN=2.4 GeV

Y. Leifels,J. Adamczewski-Musch,O. Arnold, C. Behnke,A. Belounnas,A. Belyaev, J.C. Berger-Chen, J. Biernat,A. Blanco,C. Blume,M. Böhmer,P. Bordalo,S. Chernenko,L. Chlad,C. Deveaux, J. Dreyer,A. Dybczak,E. Epple,L. Fabbietti,O. Fateev,P. Filip,P. Fonte,C. Franco, J. Friese, I. Fröhlich,T. Galatyuk,J.A. Garzón, R. Gernhäuser, M. Golubeva,R. Greifenhagen,F. Guber, M. Gumberidze,S. Harabasz,T. Heinz, T. Hennino,S. Hlavac, C. Höhne, R. Holzmann, A. Ierusalimov,A. Ivashkin, B. Kämpfer, T. Karavicheva,B. Kardan,I. Koenig,W. Koenig, B.W. Kolb,G. Korcyl,G. Kornakov,R. Kotte,A. Kugler,T. Kunz, A. Kurepin, A. Kurilkin, P. Kurilkin,V. Ladygin, R. Lalik, K. Lapidus,A. Lebedev,L. Lopes,M. Lorenz,T. Mahmoud,L. Maier,A. Mangiarotti, J. Markert,S. Maurus, V. Metag,J. Michel, D.M. Mihaylov,S. Morozov, C. Müntz, R. Münzer,L. Naumann,K. Nowakowski,M. Palka,Y. Parpottas, V. Pechenov,O. Pechenova,O. Petukhov,J. Pietraszko,W. Przygoda,S. Ramos, B. Ramstein, A. Reshetin,P. Rodriguez-Ramos,P. Rosier, A. Rost, A. Sadovsky,P. Salabura, T. Scheib, H. Schuldes,E. Schwab,F. Scozzi,F. Seck,P. Sellheim,I. Selyuzhenkov, J. Siebenson,L. Silva,Yu.G. Sobolev,S. Spataro,S. Spies, H. Ströbele,J. Stroth,P. Strzempek,C. Sturm, O. Svoboda, M. Szala, P. Tlusty, M. Traxler,H. Tsertos, E. Usenko,V. Wagner, C. Wendisch, M.G. Wiebusch, J. Wirth, Y. Zanevsky,P. Zumbruch

PHYSICS LETTERS B（2019）

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摘要

We present first data on sub-threshold production of K-s(0) mesons and Lambda hyperons in Au+Au collisions at root s(NN) = 2.4 GeV. We observe an universal < A(part)> scaling of hadrons containing strangeness, independent of their corresponding production thresholds. Comparing the yields, their < A(part)> scaling, and the shapes of the rapidity and the p(t) spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none of them can simultaneously describe these observables with reasonable chi(2) values. (C) 2019 The Authors. Published by Elsevier B.V.

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