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

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. B\"ohmer 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. Fr\"ohlich T. Galatyuk J. A. Garzon R. Gernh\"auser M. Golubeva F. Guber M. Gumberidze S. Harabasz T. Heinz T. Hennino S. Hlavac C. H\"ohne R. Holzmann A. Ierusalimov A. Ivashkin B. K\"ampfer T. Karavicheva B. Kardan I. Koenig W. Koenig B. W. Kolb G. Korcy G. Kornakov R. Kotte W. K\"uhn 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. M\"untz R. M\"unzer 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. Str\"obele 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-ex hep-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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Deep sub-threshold {φ} production and implications for the K+/K- freeze-out in Au+Au collisions

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