Relativistic Quantum Scattering of High Energy Fermions in the Presence   of Phase Transition
  We study the high energy behaviour of fermions hitting a general wall caused by a first-order phase transition. The wall profile is introduced through a general analytic function. The reflection coefficient is computed in the high energy limit and expressed in terms of the poles of the wall profile function. It is shown that the leading singularity gives the high energy behaviour. 
Jos\'e Rodr\'iguez-Quintero, Manuel Lozano and O. P\`ene