text: The Higgs potential (4) contains ﬁve parameters: m2 
  1, m2  2, λ1, λ2 and λ3. These parameters 
  
  can be rewritten in terms of two Higgs VEVs, two physical Higgs masses and the mixing 
  
  angle between them. The stationary conditions are 
  
  1 
  2 
  1 
  2 
  
  m2 
  1 + λ1v2 + 
  2 = 0,  λ3v′  (A1) 
  
  m2 
  2 + λ2v2 + 
  2 = 0.  λ3v′  (A2) 
  
  The physical Higgs masses are given by Eqs. (8) and (9) with the mixing angle that θ satisﬁes 
  
  λ3vv′ 
  
  (λ1v2  2) 
  λ2v′ 
  − 
  
  Higgs self interaction terms are expressed as 
  
  1 
  2  1 
  4  Lint = λ1vφ3 + λ2v′ψ3 + 
  λ3(vφψ2 + v′ψφ2) +  (λ1φ4 + λ2ψ4 + λ3φ2ψ2), 
  
  in terms of φ and ψ. With Eq. (7), these are rewritten in terms of h and H with θ as 