Interacting Rarita--Schwinger Field and its Spin-Parity Content
  We obtain in analytical form the dressed propagator of the massive Rarita-Schwinger field and discuss its properties. The calculation of the self-energy contributions demonstrates that besides $s=3/2$ component the Rarita-Schwinger field contains also two $s=1/2$ components of opposite parity. 
A.E. Kaloshin and V.P. Lomov