Mesons in Nuclei : η and ω Mesons(Hadrons in Nuclei,New Frontiers in QCD 2010-Exotic Hadron Systems and Dense Matter-)
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概要
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Data on the photoproduction of ω mesons on nuclei have been re-analyzed in search for in-medium modifications. The data were taken with the Crystal Barrel(CB)/TAPS detector system at the ELSA accelerator facility in Bonn. The extracted ω line shape was found to be sensitive to the background subtraction. In experiments at the tagged photon facility of the Mainz MAMI accelerator photoproduction of mesons from light nuclear targets (deuteron and ^3He) has been studied. The experiments used the combined Crystal Ball/TAPS setup in Mainz. Measurements of η^- and π^0-photoproduction off a liquid ^3He-target have been used for the search for the formation of η-mesic ^3He. The installation of the WASA detector at COSY opened a unique possibility to search for the ^4He-η bound state with high statistics and high acceptance. We are conducting a search via an exclusive measurement of the excitation function for the dd→^3Hepπ^- reaction.
- 2010-12-17
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