Double pion photoproduction off nuclei – Are there effects beyond final-state interaction?

Double Pion Photoproduction in Nuclei

The inclusive A(γ, π+π−)X reaction is studied theoretically. A sizeable enhancement of the cross section is found, in comparison with the scaling of the deuteron cross section (σdA/2). This enhancement is due to the modifications in the nuclear medium of the γN → ππN amplitude and the pion dispersion relation. The enhancement is found to be bigger than the one already observed in the (π, ππ) re...

Final state interaction effects in η photoproduction on two - and three - body nuclei

The role of final state interaction in η photoproduction on a deuteron as well as on three-body nuclei is investigated within few-body scattering theory. Deviation of the theory from the available experimental results is briefly discussed. 1. Incoherent η photoproduction on a deuteron Photoproduction of η mesons on the deuteron near threshold is strongly influenced by final state interaction (F...

2 Final State Interactions in Pion Production from Nuclei

We have calculated the effect of the inclusion of final state interactions on pion production from nuclei with incident pion beams. We find that the effect of absorption , along with geometric considerations, explains much of the enhancement at low invariant mass seen in recent data for invariant mass spectra with increasing atomic number. While the variation among nuclei is well reproduced for...

Final State Interaction Effects in B+→J/ψ π+ Decay

In this research the exclusive decay of                         is calculated by QCD factorization (QCDF) method and final state interaction (FSI). First, the  decay is calculated via QCDF method. The result that is found by using the QCDF method is less than the experimental result. So FSI is considered to solve the decay. For this decay, via the exchange of mesons are chosen for the intermedi...

Neutral pion photoproduction on nuclei in baryon chiral perturbation theory.