Fermion mixing in quasifree states
Journal of Physics A: Mathematical and General
Quantum field theoretic treatments of fermion oscillations are typically restricted to calculations in Fock space. In this letter we extend the oscillation formulae to include more general quasi-free states, and also consider the case when the mixing is not unitary.
K. C. Hannabuss, and D. C. Latimer. "Fermion Mixing in Quasifree States." Journal of Physics A: Mathematical and General. 36.4 (2003). Print.