Strong absorption of hadrons with hidden and open strangeness in nuclear matter
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)+0.014-0.012 (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 0.03(stat)+0.06-0.07 (syst) and to 0.63 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 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.
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