text: M1 denotes the amplitude by s-channel Higgs bosons h and H exchange, while 
  
  M2 does 
  hH and HH can be 
  
  that for t(u)-channel N exchange diagram. The formulas for NN 
  obtained by appropriate replacement of the vertexes, e.g., λhhh → 
  2, 
  
  → 
  λhhH. 
  
  2 = 
  
  |M1 + 
  s 
  2 − 
  
  (B6) 
  M2|  |M| 
  
  2 = λ2 
  N  2m2 
  N 
  |M1| 
  
  (cid:16) 
  ∂Ψ 
  ∂h 
  
  (cid:17) 
  2 
  i 
  
  ∂Ψ 
  ∂H 
  
  i 
  iλhhh + 
  
  iλHhh(cid:12) 
  (cid:12) 
  (cid:12) 
  (cid:12) 
  
  ,  (B7) 
  M 2  M 2 
  
  (cid:12) 
  (cid:12) 
  (cid:12) 
  (cid:12) 
  
  s 
  h + iMhΓh 
  s 
  H + iMH ΓH 
  −  − 
  
  11 