Abstract
Nuclear reactions, π−+A (A = C;W), at an incident beam momentum of 1:7 GeV/c were measured with the HADES setup at SIS18/GSI. Detailed investigations of the K+, K− and ϕ production off nuclei are connected to the study of hadron in-medium properties at nuclear saturation density. A contradictory role is played by the ϕ meson since the ϕN absorption cross-section is assumed to be small due to the OZI suppression which is in contrast to experimental observations. We present the analysis method to identify the ϕ meson exploiting the large K+K− branching ratio (≈ 50%). The correction for acceptance and effciency effects of the detector system will be discussed as well.
Highlights
Pion-nucleus reactions allow for a quantitative study of open and hidden strange hadron production and properties at a well defined nuclear density
The LEPS Collaboration determined on the basis of the A-dependent φ photoproduction yield and a Glauber-type model a large in-medium φN absorption cross-section of σφN = 35+−1171 mb [2]
We presented the on-going analysis of φ production in π− + C reactions at pπ− = 1.7 GeV/c measured with the High-Acceptance Di-Electron Spectrometer (HADES) setup
Summary
Pion-nucleus reactions allow for a quantitative study of open and hidden strange hadron production and properties at a well defined nuclear density. The LEPS Collaboration determined on the basis of the A-dependent φ photoproduction yield and a Glauber-type model a large in-medium φN absorption cross-section of σφN = 35+−1171 mb [2]. This extraced absorption cross-section is in agreement with photoproduction measurements performed by the CLAS Collaboration [3]. Transperency ratios normalized to carbon measured in pA collisions by the ANKE Collaboration point in the same direction with an effective φN absorption cross-section in the range of 14−21 mb [4]. Φ absorption in different nuclei has not been studied in pion-induced reactions and should provide complementary information to results obtained with photon and proton beams
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