Correlation energy of fractional-quantum-Hall-effect systems of   composite fermions
  We find the RPA correlation energy and collective modes of the systems of composite fermions corresponding to the fillings of $1/3$, $1/5$, $2/5$ in the fractional quantum Hall effect. It is verified that transmutations to composite fermions do not change the ground-state energy. 
P.Sitko and L.Jacak