how to modify NMIX in param_card for a binolike LSP and winolike NLSP

Hi,

Modifying this file by hand is one of the valid way to define your entry.
For the meaning of the block, I’m not a SUSY expert, so I will refer you to the paper describing the convention:
http://arxiv.org/abs/hep-ph/0311123

Cheers,

Olivier

> On Apr 19, 2016, at 15:22, yuanfang <email address hidden> wrote:
>
> Question #291449 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/291449
>
> Description changed to:
> hello , I am a beginner . I am a bit confused about neutralino mixing matrix in param_card . I am generating process :
> import model mssm
> generate p p > x1+ n2 , x1+ > w+ > n1 l+ vl , n2 > z > n1 l+ l-
> add process p p > x1- n2 , x1- > w- > n1 l- vl~ , n2 > z > n1 l+ l-
>
> In my model , I assume pMSSM models with a bino-like LSP(60%-99%) and wino-like NLSP(80%-99%) and wino-like chargino1(\chi_1) . So I modify NMIX ,UMIX,VMIX . my param_card is like this:
> NMIX:
>
> 1 1 0.6 # rnn1x1
> 1 2 0.1 # rnn1x2
> 1 3 0.1 # rnn1x3
> 1 4 0.2 # rnn1x4
> 2 1 0.06 # rnn2x1
> 2 2 0.8 # rnn2x2
> 2 3 0.06 # rnn2x3
> 2 4 0.08 # rnn2x4
> 3 1 -6.033880e-02 # rnn3x1
> 3 2 8.770049e-02 # rnn3x2
> 3 3 6.958775e-01 # rnn3x3
> 3 4 7.102270e-01 # rnn3x4
> 4 1 -1.165071e-01 # rnn4x1
> 4 2 3.107390e-01 # rnn4x2
> 4 3 6.492260e-01 # rnn4x3
> 4 4 -6.843778e-01 # rnn4x4
> BLOCK UMIX #
> 1 1 0.8 # ruu1x1
> 1 2 0.2 # ruu1x2
> 2 1 3.992666e-01 # ruu2x1
> 2 2 9.168349e-01 # ruu2x2
> BLOCK VMIX #
> 1 1 0.8 # rvv1x1
> 1 2 0.2 # rvv1x2
> 2 1 2.326612e-01 # rvv2x1
> 2 2 9.725578e-01 # rvv2x2
>
> In NMIX matrix , I only modified elements (1,1) (1,2) (1,3) (1,4) (2,1) (2,2) (2,3) (2,4) while leaving others the default values. Similarly in UMIX and VMIX , I also modified (1,1) (2,2) .
> Am I doing right or wrong? It seems strange to modify param_card like this.
>
> What makes me more confused is that it seems changing mixing matrix element has no effect on my events .So I am doubting there 's something wrong . I know in MSSM neutralinos are mixtures of the bino , wino, higgsinos . The mass matrix M can be diagonalized by a unitary matrix N . I don't know which matrix( N or M ) corresponds to NMIX ? Similarly for charginos there are U matrix and V matrix which diagonalize chargino mass matrix . So how to modify chargino matrix so that chargino1 is wino-like?
> My problems may seems stupid because I am a beginner . But I am really confused because modifying NMIX , UMIX ,VMIX has no effect on my final event analsis . Can anyone help me?
>
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