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)