We derive the standard formalism of Mikheyev, Smirnov, and Wolfenstein for the oscillation of neutrinos in matter taking into account the Lorentz and second-quantized structure of the neutrino fields. We consider neutrinos with Dirac or Majorana masses.

• Received 21 October 1987

DOI:https://doi.org/10.1103/PhysRevD.37.1935