text: χ0 
  4∆2 
  Ω D( 4∆2 
  
  Ω2 ) + iΩK2(1 − 4∆2 
  Ω2 ) 
  (cid:1) 
  
  # 
  
  for Ω >> 2∆ (23) 
  
  In the SCS fermionic excitations acquire a gap. This 
  gap aﬀects fermionic self-energy in two ways: directly, via 
  the change of the dispersion of an intermediate boson in 
  the exchange process involving a CB, and indirectly, via 
  the change of the propagator of a CB. We remind our- 
  selves that the dynamics of a CB comes from a particle- 
  hole bubble which is indeed aﬀected by ∆. 
  
  Substituting Eq 6 for χ(q, Ω) into the formula for the 
  self-energy one obtains Σ′′(ω) in a SCS state as a sum of 
  two terms31  The eﬀect of a d−wave pairing gap on a CB has been 
  discussed in a number of papers, most recently in31. In 