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 Ciepał, C Deveaux, D Dittert, J Dreyer,E Epple, L Fabbietti, O Fateev,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,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 Kuboś,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 Nowakowski,Y Parpottas, V Pechenov,O Pechenova, O Petukhov,J Pietraszko, A P Prozorov, W Przygoda, B Ramstein,N Rathod, 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 Vázquez Doce,V Wagner, C Wendisch, M G Wiebusch, J Wirth, D Wójcik, Y Zanevsky,P Zumbruch, C Curceanu,K Piscicchia,A Scordo

PHYSICAL REVIEW LETTERS（2019）

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摘要

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 +/- 0.009(stat)(-0.012)(+0.014)(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 +/- 0.04(stat)(-0.07)(+0.06) (syst) and to 0.63 +/- 0.06(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. production off C and W nuclei is discussed in terms of a strong phi N in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.

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