Elsevier

Physics Letters B

Volume 408, Issues 1–4, 11 September 1997, Pages 12-18
Physics Letters B

Virtual pion scattering

https://doi.org/10.1016/S0370-2693(97)00773-9Get rights and content

Abstract

We explore coherent pion production in (3He,3Hπ+) and (p,nπ+) reactions as effective virtual pion scattering, in calculations of cross sections to the ground state and low-lying excitations of the target nucleus. Our coupled-channel model includes a source term emulating a virtual-pion beam and an optical potential for the interaction of the pion in the medium. We demonstrate that the landmark lowering of the peak in the energy-transfer spectra is entirely determined by the rescattering of the pion, and that its low-energy wing is sensitive to the pion-nucleon s-wave amplitude including its off-shell behavior.

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    This work has been supported in part by the International Science Foundation grant NQE000 (VFD), and by the European Union program “Human Capital and Mobility” contract ERBCHBICT930258 (MAK).

    1

    Current address: Laboratoire National Saturne, 91191 Gif-sur-Yvette CEDEX, France.

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