Strong absorption of hadrons with hidden and open strangeness in nuclear matter

J. Adamczewski-Musch , O. Arnold , E. T. Atomssa , C. Behnke , A. Belounnas , A. Belyaev , J. C. Berger-Chen , J. Biernat

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A. Blanco C. Blume M. B\"ohmer S. Chernenko L. Chlad P. Chudoba I. Ciepal C. Deveaux D. Dittert J. Dreyer A. Dybczak E. Epple L. Fabbietti O. Fateev P. Fonte C. Franco J. Friese I. Fr\"ohlich T. Galatyuk J. A. Garzon R. Gernh\"auser M. Golubeva R. Greifenhagen F. Guber M. Gumberidze S. Harabasz T. Heinz T. Hennino C. H\"ohne R. Holzmann A. Ierusalimov A. Ivashkin B. K\"ampfer B. Kardan I. Koenig W. Koenig B. W. Kolb G. Korcyl G. Kornakov F. Kornas R. Kotte J. Kubos A. Kugler T. Kunz A. Kurepin A. Kurilkin P. Kurilkin V. Ladygin R. Lalik K. Lapidus A. Lebedev S. Linev L. Lopes M. Lorenz T. Mahmoud L. Maier A. Malige J. Markert S. Maurus V. Metag J. Michel D. M. Mihaylov V. Mikhaylov S. Morozov C. M\"untz R. M\"unzer L. Naumann K. Nowakowsk Y. Parpottas V. Pechenov O. Pechenova O. Petukhov J. Pietraszko A. P. Prozorov W. Przygoda B. Ramstein A. Reshetin P. Rodriguez-Ramos A. Rost A. Sadovsky P. Salabura T. Scheib K. Schmidt-Sommerfeld H. Schuldes E. Schwab F. Scozzi F. Seck P. Sellheim J. Siebenson L. Silva J. Smyrski S. Spataro S. Spies H. Str\"obele J. Stroth P. Strzempek C. Sturm O. Svoboda M. Szala P. Tlusty M. Traxler H. Tsertos C. Ungeth\"um O. Vazquez Doce V. Wagner C. Wendisch M. G. Wiebusch J. Wirth Y. Zanevsky P. Zumbruch

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classification ⚛️ nucl-ex

keywords absorptionnuclearreactionsstatsystdynamicsfirstfound

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We present the first observation of K- and \phi absorption within nuclear matter by means of \pi- -induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studied with HADES at SIS18/GSI. The double ratio (K-/K+)W / (K-/K+)C is found to be 0.319 \pm 0.009(stat)+0.014-0.012 (syst) indicating a larger absorption of K- in heavier targets as compared to lighter ones. The measured \phi/K- ratios in \pi-+C and \pi^- +W reactions within the HADES acceptance are found to be equal to $0.55 \pm 0.03(stat)+0.06-0.07$ (syst) and to $0.63 \pm 0.05(stat)-0.11+0.11$ (syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the \phi meson in nuclear medium is strongly coupled to the K- dynamics. The large difference in the \phi production off C and W nuclei is discussed in terms of a strong \phiN in-medium coupling.

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Strong absorption of hadrons with hidden and open strangeness in nuclear matter

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