Two pion photoproduction on nucleons and nuclei in the rho and sigma regions

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dc.creatorOset, E.
dc.creatorRoca, L.
dc.creatorVacas, M. J. Vicente
dc.creatorNacher, J. C.
dc.date2001-12-12
dc.date.accessioned2026-07-07T05:38:52Z
dc.date.available2026-07-07T05:38:52Z
dc.descriptionIn this talk we report on two physical processes, the photoproduction of $ρ$ mesons in nuclei and the $π^0 π^0$ photoproduction in nuclei at low energies. In the first case the aim is to observe experimentally the theoretically predicted changes on the $ρ$ properties in the nuclear medium. In the second case one wishes to investigate the modifications of the $ππ$ interaction in the nuclear medium in the region of the $σ$ meson. In the first case we observe that it is quite difficult to see large effects due to the $ρ$ modification in the medium because the detection of the $ρ$ is done through the two pions which are produced in the $Δ$ region and are largely distorted in the medium. In the second case, when the I=0 part of the $ππ$ interaction is substituted by the in medium $ππ$ amplitude, we observe a very large shift of strength in the invariant mass distribution to small values of the mass in $^{12}C$ and $^{208}Pb$ with respect to the distribution of the elementary reaction. This spectacular shift appears to be corroborated by recent experiments at Mainz reported in this same Workshop.
dc.description16 pags., 19 figs., Contribution to the Workshop on chiral fluctuations in hadronic matter, Orsay, Sep. 2001
dc.identifierhttps://arxiv.org/abs/nucl-th/0112033
dc.identifierhttp://arxiv.org/abs/nucl-th/0112033
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/81768
dc.subjectNuclear Theory
dc.titleTwo pion photoproduction on nucleons and nuclei in the rho and sigma regions
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