Recent Developments in one and two Pion Production in Elementary Reactions and Few Body Systems
Abstract
In this talk we cover several issues concerning pion production. The first one is the p p ----> p p pi0 reaction where an alternative explanation based on the off shell extrapolation of the pi N amplitude is offered. A recent model for the gamma N ----> pi pi N reaction is presented and a new kind of exchange current is constructed from it which allows one to address problems like double Delta photoproduction from the deuteron. Finally the (gamma, pi pi) reaction in nuclei is studied and shown to be highly sensitive to the renormalization of the pions in nuclei.
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