Electromagnetic corrections to the hadronic phase shifts in low energy   pi+p elastic scattering
  We calculate the s and p-wave electromagnetic corrections which must be subtracted from the nuclear phase shifts obtained from the analysis of low energy pi+p elastic scattering data, in order to obtain hadronic phase shifts. 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