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Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy 10

HK 47.6: Talk

Wednesday, March 25, 2015, 15:45–16:00, T/SR25

In-medium properties of the ω-meson — •Stefan Friedrich for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen

The attenuation of ω-mesons in cold nuclear matter has been studied in photonuclear reactions on proton, 12C and 93Nb nuclei, using the tagged photon beam at the ELSA accelerator in Bonn. The combined setup of the Crystal Barrel and MiniTAPS detector systems, which form a 4π electromagnetic calorimeter, was used for detecting the ω-mesons via the ω→π+γ decay mode.
Results on the in-medium width of the ω-meson, derived from the transparency ratio measurements, will be presented and compared to experimental data [1] and recent theoretical predictions [2,3]. The inelastic ωN cross section is deduced as a function of momentum as well. In particular, the momentum-dependence for slow ω-mesons will be discussed.
Kotulla et al., Phys. Rev. Lett. 100 (2008), 192302
Cabrera and Rapp, Phys. Lett. B 729 (2014), 67
Ramos et al., Eur. Phys. Jour. A 49 (2013), 148
Funded by DFG (SFB/TR16)

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