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arXiv · 0712.1186

Energy dependence of forward 1S0 diproton production in the pp -> pp pi0 reaction

V. Kurbatov·M. Buescher·S. Dymov·D. Gusev·M. Hartmann·A. Kacharava·A. Khoukaz·V. Komarov·A. Kulikov·G. Macharashvili·T. Mersmann·S. Merzliakov·S. Mikirtytchiants·D. Prasuhn·F. Rathmann·R. Schleichert·H. Stroeher·D. Tsirkov·Y. Uzikov·C. Wilkin·S. Yaschenko
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Abstract

The pp -> {pp}_s pi0 differential cross section has been measured with the ANKE spectrometer at COSY-Juelich for seven proton beam energies T_p between 0.5 and 1.97 GeV. By selecting proton pairs with an excitation energy of less than 3 MeV it is ensured that the final {pp}_s system is in the 1S0 state. In the measured region of theta_{pp}^{cm} < 18 deg, the data reveal a forward dip for T_p =< 1.4 GeV whereas a forward peaking is seen at 1.97 GeV. The energy dependence of the forward cross section shows a broad peak in the 0.6-0.8 GeV region, probably associated with Delta(1232) excitation, and a minimum at 1.4 GeV. Some of these features are similar to those observed for the spin-isospin partner reaction, pp -> d pi+. However, the ratio of the forward differential cross sections of the two reactions shows a significant suppression of single pion production associated with a spin--singlet final nucleon pair.

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V. Kurbatov, M. Buescher, S. Dymov, D. Gusev, M. Hartmann, A. Kacharava, A. Khoukaz, V. Komarov, A. Kulikov, G. Macharashvili, T. Mersmann, S. Merzliakov, S. Mikirtytchiants, D. Prasuhn, F. Rathmann, R. Schleichert, H. Stroeher, D. Tsirkov, Y. Uzikov, C. Wilkin, S. Yaschenko. 2007-12-07. Energy dependence of forward 1S0 diproton production in the pp -> pp pi0 reaction. https://doi.org/10.1016/j.physletb.2008.01.051

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