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25 April 2024

» arxiv » 1812.3728

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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 ; A. Blanco ; C. Blume ; M. Böhmer ; 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. Fröhlich ; T. Galatyuk ; J. A. Garzon ; R. Gernhäuser ; M. Golubeva ; R. Greifenhagen ; F. Guber ; M. Gumberidze ; S. Harabasz ; T. Heinz ; T. Hennino ; C. Höhne ; R. Holzmann ; A. Ierusalimov ; A. Ivashkin ; B. Kämpfer ; 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. Müntz ; R. Münzer ; 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. Ströbele ; J. Stroth ; P. Strzempek ; C. Sturm ; O. Svoboda ; M. Szala ; P. Tlusty ; M. Traxler ; H. Tsertos ; C. Ungethüm ; O. Vazquez Doce ; V. Wagner ; C. Wendisch ; M. G. Wiebusch ; J. Wirth ; Y. Zanevsky ; P. Zumbruch ;
Date:	10 Dec 2018
Abstract:	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.
Source:	arXiv, 1812.3728
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