Nuclear transparencies from photoinduced pion production

Abstract

We present a relativistic and cross-section factorized framework for computing nuclear transparencies extracted from $A(\ensuremath{\gamma},\ensuremath{\pi}N)$ reactions at intermediate energies. The proposed quantum mechanical model adopts a relativistic extension to the multiple-scattering Glauber approximation to account for the final state interactions of the ejected nucleon and pion. The theoretical predictions are compared against the experimental $^{4}\mathrm{He}$$(\ensuremath{\gamma},p{\ensuremath{\pi}}^{\ensuremath{-}})$ data from the Thomas Jefferson National Accelerator Facility. For those data, our results show no conclusive evidence of the onset of mechanisms related to color transparency.