text: 4 
  
  ∂Ψ 
  ∂h (cid:19) 
  8 
  (cid:18)− 
  2 
  
  (B8) 
  
  ∂Ψ 
  ∂h (cid:19) 
  4m2 
  2b 
  
  ∂Ψ 
  ∂h 
  (cid:18) 
  N + A 
  
  ∂Ψ 
  ∂H 
  
  i 
  ∗2 = 4mN λ3 
  2 M1M 
  
  N (cid:18) 
  s 
  
  M 2 
  A + 2b 
  2b(cid:12) 
  A 
  (cid:19) 
  (cid:12) 
  (cid:12) 
  (cid:12) 
  
  M 2  s 
  H + iMHΓH 
  − 
  
  4 +  ln  (B9)  − 
  
  (cid:12) 
  (cid:12) 
  (cid:12) 
  (cid:12) 
  where θ is the scattering angle in the center of mass frame. The auxiliary functions appear 
  
  (cid:18)− 
  − 
  
  above are deﬁned as 
  
  s(A + m2  3m2  4m2 
  N (s  N )  N ) 
  I22(s)  ,  (B10)  −  − 
  
  4a2  2m2 
  N )(m2  m2 
  h) 
  2A(A + 2a)  (s 
  N −  −  − 
  
  (B11) 
  
  (B12) 
  
  m2  b(s, mN , mh)  (B13) 
  hr  ≡ r 