Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Hadronenstruktur und -spektroskopie VI
HK 24.8: Vortrag
Dienstag, 22. März 2011, 18:30–18:45, C-2
Measurement of the vector analyzing power of the p→p→{pp}sπ0 reaction at intermediate energies at ANKE/COSY — •Dmitry Tsirkov — Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia
The reaction p→p→{pp}sπ0, where {pp}s is a proton pair with an excitation energy Epp < 3 MeV, has been observed with the ANKE spectrometer at COSY-Jülich using a polarized beam with energies 353, 500, 550 and 700 MeV. The data have been processed to obtain the vector analyzing power Ay of the reaction. The setup acceptance covers most of the angular range at 353 MeV and forward angles at the higher beam energies, allowing one to obtain the Ay angular dependence. From the results of the analysis at 353 MeV, one can extract information on the pion d-wave contribution, which is important for Chiral Perturbation Theory tests at this energy. At higher energies the results are compared with a phenomenological model and this gives additional information about Δ-nucleon dynamics.
Supported by the COSY-FFE program.