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Do any one know how from the mass eigenvalues:

## M_{H,h}^2 = \frac{1}{2} [\lambda_1 v_1^2 + \lambda_2 v_2^2 \mp \sqrt{(\lambda_1 v_1^2 - \lambda_2 v_2^2)^2 + 4 \lambda^2 v_1^2 v_2^2} ], ##

and ## \tan 2\alpha =\frac{2 \lambda v_1 v_2}{\lambda_1 v_1^2 - \lambda_2 v_2^2} ##

To get the couplings ## \lambda_{1,2} ## as in Equs. (6) in [arXiv:1508.00702v2[hep-ph]]

or Equs. (9) in [arXiv:1303.5098v1 [hep-ph]], Note that I'd like to put ## m_{12} =0 ##.

PS. The angle ## \alpha ## is the angle which diagnolize the mass matrix of the two cp- even Higgs scalars of the two Higgs doublets ## \Phi_1 ## and ## \Phi_2 ## in the 2HD potential (2), [arXiv:1508.00702v2[hep-ph]] to get the physical states: h, H, so it's Eigenvalues problem. But now after getting mh and mH, how to get the couplings ## \lambda_{1,2,3} ## in terms of them ?

You can see in [arXiv:1508.00702v2[hep-ph]] that ## \lambda_{4,5} ## can be driven easily from the charged and the cp- odd Higgs masses (5) .

Any help ?

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# A How to get these Equations?

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