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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 dp3 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 dp3 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 dp3 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.

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