In medium sigma meson effects in two pion photoproduction in nuclei

Details In medium sigma meson effects in two pion photoproduction in nuclei In medium sigma meson effects in two pion photoproduction in nuclei

2002-11-29

arxiv.org/abs/nucl-th/0211097v1

Nucl.Phys.A721:719-722,2003

Physics

Nuclear Physics

Nuclear Theory

Contribution to the XVIth International Conference on Particles and Nuclei (PANIC02), Osaka, Japan, 30 September 4 October 200

Scientific paper

10.1016/S0375-9474(03)01165-5

We show theoretical results for $(\gamma, \pi^0 \pi^0)$ production on nucleons and nuclei in the kinematical region where the scalar isoscalar $\pi \pi$ amplitude is influenced by the $\sigma$ pole. The final state interaction of the pions modified by the nuclear medium produces a spectacular shift of strength of the two pion invariant mass distribution induced by the moving of the $\sigma$ pole to lower masses and widths as the nuclear density increases.

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