Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadronenstruktur und -spektroskopie
HK 38.2: Group Report
Thursday, March 22, 2012, 17:00–17:30, RW 1
Production of η mesons and pion pairs in dp scattering at COSY-ANKE — •Michael Papenbrock, Paul Goslawski, Alfons Khoukaz, Malte Mielke, Daniel Schröer, and Alexander Täschner — Westfälische Wilhelms-Universität, Münster, Germany
Detailed measurements on the reaction dp → 3 He η with unpolarized particles have been performed at the COSY-ANKE spectrometer. The rapid rise of the total cross section within the first 0.5 MeV above threshold implies a very strong final state interaction and might indicate the presence of a quasi-bound η-mesic state close to threshold. To further investigate this issue, measurements with a polarized deuteron beam have been performed in order to determine tensor analyzing powers in the near-threshold region. Furthermore, the reaction dp → 3 He η has been used to perform a high precision measurement on the η meson mass by a model independent method based on pure kinematics.
Parallel to measurement on the η meson, data on the production of charged pion pairs have been taken. In the studied energy region, the reaction dp → 3 He π+ π− allows for further investigation on the ABC effect, a phenomenon which enhances the two pion invariant mass distribution at low values.
Recent results on these topics will be presented and discussed.
Supported by the COSY-FFE program.