Kinematically complete measurement of the reaction <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">π</mi></mrow><mrow><mi mathvariant="normal">−</mi></mrow></msup></mrow></math>p→<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">π</mi></mrow><mrow><mi mathvariant="normal">−</mi></mrow></msup></mrow></math>n in the region of Δ dominance as a test of chiral Lagrangians

H.-W. Ortner; R. Baran; U. Bohnert; M. Dillig; G. Herrmann; A. Hofmann; P. Helbig; O. Jäkel; W. Kluge; H. Krüger; D. Malz; H. Matthäy; R. Müller; W. Menzel; L. Schweinzer; S. Wirth

doi:10.1103/PhysRevLett.64.2759

Kinematically complete measurement of the reaction $π^{-}$ p→ $π^{+}$ $π^{-}$ n in the region of Δ dominance as a test of chiral Lagrangians

H.-W. Ortner, R. Baran, U. Bohnert, M. Dillig, G. Herrmann, A. Hofmann, P. Helbig, O. Jäkel, W. Kluge, H. Krüger, D. Malz, H. Matthäy, R. Müller, W. Menzel, L. Schweinzer, and S. Wirth

Phys. Rev. Lett. 64, 2759 – Published 4 June 1990

Abstract

The first kinematically complete, good-statistics data for the (π,2π) reaction on the proton are presented. They involve double- and triple-differential cross sections as well as $π^{+}$ $π^{-}$ angular correlations. At energies around the Δ resonance, they exhibit a marked difference from phase space. The data are qualitatively described within the framework of an extension of Weinberg’s effective chiral Lagrangian.

Received 6 November 1989

DOI:https://doi.org/10.1103/PhysRevLett.64.2759

Authors & Affiliations

H.-W. Ortner, R. Baran, U. Bohnert, M. Dillig, G. Herrmann, A. Hofmann, P. Helbig, O. Jäkel, W. Kluge, H. Krüger, D. Malz, H. Matthäy, R. Müller, W. Menzel, L. Schweinzer, and S. Wirth

Physikalisches Institut der Universität Erlangen, Erwin-Rommel-Strasse 1, D-8520 Erlangen, West Germany
Institut für Theoretische Physik III der Universität Erlangen, Staudstrasse 7, D-8520 Erlangen, West Germany
Kernforschungszentrum Karlsruhe und Institut für Experimentelle Kernphysik, Postfach 3640, D-7500 Karlsruhe 1, West Germany