Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Elektromagnetische und Hadronische Sonden

HK 9.10: Talk

Monday, March 10, 2008, 18:45–19:00, 1C

Study of the forward ¹S₀ diproton production in the pp→ ppπ⁰ reaction at ANKE — •Sergey Dymov for the ANKE collaboration — Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany

Single pion production in nucleon-nucleon collisions, NN→ NNπ, is one of the principial tools used in the investigation of NN dynamics at intermediate energies. Because of large momentum transfers involved, even close to threshold, such a meson production is sensitive to the short-distance part of the NN-interaction. The ratio of pp→ (pp)_s(0^∘)π⁰ to pp→ d(0^∘)π⁺ cross sections can provide information on the relative strength of spin-sinlet to spin-triplet production. Prior to our study of the pp→ (pp)_s(0^∘)π⁰ reaction at ANKE, the only published data in the ¹S₀ conditions were limited to energies T_p<0.425 GeV. The pp→ (pp)_sπ⁰ differential cross section has been measured with the ANKE spectrometer at COSY-Jülich for seven proton beam energies T_p between 0.5 and 2.0 GeV. The obtained energy dependence of the cross section and of the singlet/triplet ratio will be presented. In a subsequent experiment in October 2007 the cross section has been measured at additional five beam energies in the range T_p=0.35−2.4 GeV. Preliminary results of the analysis of the new data will be shown.