München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Elektromagnetische und Hadronische Sonden

HK 16.5: Vortrag

Dienstag, 21. März 2006, 15:00–15:15, G

Test of the spectator model in the dp→ ppπ⁻p_spect reaction — •Eberhard Kuhlmann — IKTP, TU Dresden

As part of our program on meson-production in NN-reactions first measurements have been performed on the np-entrance channel by use of either a deuteron target or a deuteron beam. Since the neutron, when bound in the deuteron, necessarily is off-shell, some model dependence in the course of the analysis cannot be avoided. For a check on the validity of the spectator model the reaction np→ ppπ⁻ seems to be ideal. In the literature one can find an extensive set of data where a neutron beam has been employed. These will be compared to our data taken with the COSY-TOF spectrometer by use of a 1.85 GeV/c deuteron beam impinging on a liquid hydrogen target. Only charged particles show up in the exit channel, the spectator proton p_spect is easily detected with roughly half the beam momentum in a narrow cone around the beam axis. The sensitivity of the description of the experimental data to the parametrization of the deuteron wavefunction entering into the Monte Carlo simulations will be discussed.

Supported by BMBF and FZ Jülich