The sigma meson in a nuclear medium through two pion photoproduction

Details The sigma meson in a nuclear medium through two pion photoproduction The sigma meson in a nuclear medium through two pion photoproduction

2002-06-24

arxiv.org/abs/nucl-th/0206055v1

Phys.Lett. B541 (2002) 77-86

Physics

Nuclear Physics

Nuclear Theory

Contribution to the MESON 2002 Workshop. Krakow 24-28 May 2002

Scientific paper

10.1016/S0375-9474(03)01165-5

We present theoretical results for (gamma,pi0 pi0) and (gamma,pi+- pi0) 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 pi0 pi0 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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