Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 34: Theorie

HK 34.5: Talk

Tuesday, March 8, 2005, 17:30–17:45, TU MA042

Double pion production in nuclei — •Pascal Muehlich, Luis Alvarez-Ruso, Oliver Buss und Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

Double pion production in nuclei has been proposed to be a unique method the determine experimentally how the ππ interaction in the σ channel changes in the nuclear medium. Even at low energies, i. e. for average pion energies below the Δ resonance, the final ππ system underlies strong final state interactions due to π N collisions in the nuclear environment. We present a systematic analysis of double pion production in photon-, pion- and proton-induced reactions in nuclei, employing a semi-classical transport approach including the full coupled-channel dynamics of the π N final state interactions. We find a non-negligible effect of quasi-elastic and charge-exchange scattering, which in some cases appears to be sufficient to explain the experimental data without introducing further medium modifications. The aim of our work is to describe simultaneously photon- and hadron-induced reactions in nuclei with the very same physical input, providing a basis for the interpretation of results of ongoing experimental research.
Work supported by DFG.