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Deep sub-threshold {\phi} production and implications for the K+/K- freeze-out in Au+Au collisions

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arxiv 1703.08418 v2 pith:2SZCZ32H submitted 2017-03-24 nucl-ex hep-ex

J. Adamczewski-Musch , O. Arnold , C. Behnke , A. Belounnas , A. Belyaev , J.C. Berger-Chen , J. Biernat , A. Blanco
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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. Garzon R. Gernhäuser M. Golubeva 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. Korcy G. Kornakov R. Kotte W. Kühn 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. N. 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 J. Siebenson L. Silva Yu.G. Sobolev S. Spataro 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 (HADES collaboration)
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classification nucl-exhep-ex
keywords mesonscollisionsdifferentslopesspectraadaptedargumentationbaryons
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We present data on charged kaons (K+-) and {\phi} mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K and {\phi} mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The {\phi}/K- multiplicity ratio is found to be surprisingly high with a value of 0.52 +- 0.16 and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K- transverse-mass spectra can be explained solely by feed- down, which substantially softens the spectra of K- mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze- out temperatures of K+ and K- mesons caused by different couplings to baryons.

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    Short range correlated nucleon pairs can explain enhanced sub-threshold production of strange and charmed hadrons in proton-nucleus collisions, with the SRC tail raising yields by up to 10^3 versus a Fermi gas.

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