• S Schadmand

      Articles written in Pramana – Journal of Physics

    • Two-pion production in photon-induced reactions

      S Schadmand

      More Details Abstract Fulltext PDF

      Differences in the photoproduction of mesons on the free proton and on nuclei are expected to reveal changes in the properties of hadrons. Inclusive studies of nuclear photoabsorption have provided evidence of medium modifications. However, the results have not been explained in a model independent way. A deeper understanding of the situation is anticipated from a detailed experimental study of meson photoproduction from nuclei in exclusive reactions. In the energy regime above the Δ(1232) resonance, the dominant double pion production channels are of particular interest. Double pion photoproduction from nuclei is also used to investigate the in-medium modification of meson-meson interactions

    • Hadrons and broken symmetries with WASA-at-COSY

      S Schadmand Wasa-at-Cosy

      More Details Abstract Fulltext PDF

      The WASA Detector Facility is an internal experiment at the cooler synchrotron (COSY) in Jülich, Germany. The COSY accelerator provides proton and deuteron beams with momenta up to 3.7 GeV/c giving access to hadron physics including the strange quark sector. The physics program with the WASA detector involves hadron dynamics and hadron structure. Key experiments address fundamental symmetries and symmetry violations via the study of rare and not-so-rare meson decays. From the very first production run, results on the Dalitz plot slope parameter in the isospin violating $\eta \rightarrow 3\pi^{0}$ decay have been obtained. The $3\pi^{0}$ final state is also used to study meson production mechanisms. Investigations of other decay modes of the $\eta$-meson address $C$, $P$, and $T$ symmetries and combinations. Higher orders in chiral perturbation theory are probed with the $\eta \rightarrow \pi^{0} \gamma \gamma$ decay. The status and plans for studying hadron structure with Dalitz decays of mesons are presented.

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