Electromagnetic corrections for the analysis of low energy pi-p   scattering data
  We calculate the electromagnetic corrections to the isospin invariant mixing angle and to the two eigenphases for the s and p-waves for low energy pi-p elastic and charge exchange scattering. These corrections have to be applied to the nuclear quantities obtained from phase shift analyses of the experimental data in order to obtain the hadronic phases. We compare our results with earlier calculations and estimate the uncertainties in the corrections. 
A. Gashi, E. Matsinos, G. C. Oades, G. Rasche and W. S. Woolcock