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HK: Physik der Hadronen und Kerne

HK 46: Electromagnetic and Hadronic Probes VI

HK 46.4: Talk

Thursday, March 14, 2002, 17:15–17:30, D

Pion-Proton-Scattering at Low Energies — •Holger Denz, Johannes Breitschopf, Heinz Clement, Margit Cröni, Arthur Erhardt, Rudolf Meier, Jens Pätzold, Florian von Wrochem, and Gerhard J. Wagner — Universität Tübingen, Physikalisches Institut, Auf der Morgenstelle 14, 72076 Tübingen, Germany

From πp observables, important quantities of the strong interaction can be extracted: the πNN coupling constant, the πN sigma-term and the size of isospin symmetry violation. Presently, there is no agreement on the value of any of these quantities. This is partly due to the unsatisfactory status of the πp data base, in particular at low energies. New measurements of πp observables at low energies are aimed at providing additional information and resolving discrepancies. Elastic scattering cross sections have been measured with the CHAOS detector at TRIUMF for several pion energies down to 15 MeV. A large angular range has been covered with special emphasis on forward angle measurements in the Coulomb-nuclear interference region. Elastic scattering polarization observables have been measured, both with the CHAOS detector and, at PSI, with the LEPS spectrometer and an active polarized target. An experiment measuring the π⁻p→ π^∘n total cross section from 30 to 250 MeV using a transmission technique has started taking data at PSI. Status and/or results of these experiments will be discussed. This work is supported by BMBF (06Tü987I) and DFG (Europäisches Graduiertenkolleg Basel-Tübingen).