We present the first observation of K- and φ absorption within nuclear matter by means of π - 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 φ/K- ratios in π-+C and π-+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 φ meson in nuclear medium is strongly coupled to the K- dynamics. The large difference in the φ production off C and W nuclei is discussed in terms of a strong φN in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.

Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter

Spataro S.;
2019-01-01

Abstract

We present the first observation of K- and φ absorption within nuclear matter by means of π - 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 φ/K- ratios in π-+C and π-+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 φ meson in nuclear medium is strongly coupled to the K- dynamics. The large difference in the φ production off C and W nuclei is discussed in terms of a strong φN in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.
2019
123
2
022002-1
022002-6
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.022002
Adamczewski-Musch J.; Arnold O.; Atomssa E.T.; Behnke C.; Belounnas A.; Belyaev A.; Berger-Chen J.C.; Biernat J.; Blanco A.; Blume C.; Bohmer M.; Chernenko S.; Chlad L.; Chudoba P.; Ciepal I.; Deveaux C.; Dittert D.; Dreyer J.; Epple E.; Fabbietti L.; Fateev O.; Fonte P.; Franco C.; Friese J.; Frohlich I.; Galatyuk T.; Garzon J.A.; Gernhauser R.; Golubeva M.; Greifenhagen R.; Guber F.; Gumberidze M.; Harabasz S.; Heinz T.; Hennino T.; Hohne C.; Holzmann R.; Ierusalimov A.; Ivashkin A.; Kampfer B.; Kardan B.; Koenig I.; Koenig W.; Kolb B.W.; Korcyl G.; Kornakov G.; Kornas F.; Kotte R.; Kubos J.; Kugler A.; Kunz T.; Kurepin A.; Kurilkin A.; Kurilkin P.; Ladygin V.; Lalik R.; Lapidus K.; Lebedev A.; Linev S.; Lopes L.; Lorenz M.; Mahmoud T.; Maier L.; Malige A.; Markert J.; Maurus S.; Metag V.; Michel J.; Mihaylov D.M.; Mikhaylov V.; Morozov S.; Muntz C.; Munzer R.; Naumann L.; Nowakowski K.; Parpottas Y.; Pechenov V.; Pechenova O.; Petukhov O.; Pietraszko J.; Prozorov A.P.; Przygoda W.; Ramstein B.; Rathod N.; Reshetin A.; Rodriguez-Ramos P.; Rost A.; Sadovsky A.; Salabura P.; Scheib T.; Schmidt-Sommerfeld K.; Schuldes H.; Schwab E.; Scozzi F.; Seck F.; Sellheim P.; Siebenson J.; Silva L.; Smyrski J.; Spataro S.; Spies S.; Strobele H.; Stroth J.; Strzempek P.; Sturm C.; Svoboda O.; Szala M.; Tlusty P.; Traxler M.; Tsertos H.; Ungethum C.; Vazquez Doce O.; Wagner V.; Wendisch C.; Wiebusch M.G.; Wirth J.; Wojcik D.; Zanevsky Y.; Zumbruch P.; Curceanu C.; Piscicchia K.; Scordo A.
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.123.022002.pdf

Accesso riservato

Descrizione: Articolo originale
Tipo di file: PDF EDITORIALE
Dimensione 324 kB
Formato Adobe PDF
324 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
1812.03728.pdf

Accesso aperto

Descrizione: Arxiv
Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 207.21 kB
Formato Adobe PDF
207.21 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1804561
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 14
social impact