Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Hadronenstruktur und -spektroskopie VI

HK 26.4: Vortrag

Dienstag, 16. März 2010, 17:30–17:45, HG IV

Investigation of the η − 3He final state in proton-deuteron collisions — •Michael Papenbrock, Alfons Khoukaz, Ingo Burmeister, Paul Goslawski, Malte Mielke, Tobias Rausmann, and Alexander Täschner — Westfälische Wilhelms-Universität, Münster, Germany

Measurements obtained with the ANKE spectrometer at the COoler SYnchrotron - COSY - of the Forschungszentrum Jülich on the reaction d + p → 3He + η provided extensive data in the energy range very close to the production threshold. The observed excitation function suggests the presence of an unexpected strong final state interaction and the extracted large scattering length aη   He might indicate the existence of a quasi-bound state of the η − 3He system.

Further data at excess energies of 20, 40, and 60 MeV have been obtained recently with ANKE to extend the excitation function towards higher energies and to investigate contributions of higher partial waves. Additionally, measurements with a polarised deuteron beam have been performed in order to study in more detail the final state interaction and to disentangle partial wave contributions.

Recent results will be presented and discussed.

Supported by the COSY-FFE program.

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