text: with the left-handed lepton doublets. 
  
  The general Higgs potential for the SU(2)L doublet Φ and a singlet B  L Higgs Ψ is 
  − 
  
  generally given by 
  
  V (Φ, Ψ) = m2 
  1|  2 + m2 
  2| 
  
  2 + λ1| 
  3 
  
  4 + λ2|  4 + λ3| 
  
  2 
  2. 
  Φ 
  | 
  Ψ 
  Φ 
  | 
  Ψ 
  Φ 
  | 
  Ψ  (4) 
  |  |  |  | 