How to load a sm model with ckm matrices?

Hi,

you can use one of the three following model:

import model sm-ckm
import model sm-full
import model sm-zeromass_ckm
The difference between those three models are the mass of lepton/quarks.
I would advise to use sm-ckm

To be complete, you can also customize the standard model by doing:
import model sm
customize_model --save=MY

This will ask you the following question:
sm customization:
    1: diagonal ckm [True]
    2: c mass = 0 [True]
    3: b mass = 0 [False]
    4: tau mass = 0 [False]
    5: muon mass = 0 [True]
    6: electron mass = 0 [True]
Enter a number to change it's status or press enter to validate.
For scripting this function, please type: 'help'[60s to answer]

After having done that, you can import your model with those specification by doing
import model sm-MY

Cheers,

Olivier

PS: Only a couple of model support customization (sm/mssm/EWDim6)

On Apr 25, 2013, at 5:21 AM, tang yilei <email address hidden> wrote:

> New question #227415 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/227415
>
> I want to load a standard model with ckm matrices, but I could not find any model with "ckm" in "models" directory. However, I searched here and found a person questioned sm_ckm model. How can I import a model with ckm matrices?
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Thank you Olivier for this useful information. It seems that sm model uses by default CKM matrix as diagonal.

Can I ask where (which file) can I find the values for the CKM matrix elements that are used in the calculation please?
I didn't find this information in both "param.card.dat" and "run1-app.log" files.

Thank you in advance,
Best,
Asma

Hi Asma,

I've done the following:
./bin/mg5
generate p p > e+ e-
output
launch -f

then If I look at:
SubProcesses/P0_qq_ll/G2/run_01_log.txt
I have the following lines:

  Internal Params
  ---------------------------------
 conjg__CKM1x1 = 1.0000000000000000
 conjg__CKM3x3 = 1.0000000000000000
 CKM3x3 = 1.0000000000000000

Note that the value set at zero/one are not always written since some of them can be remove of the model to make it lighther.

Cheers,

Olivier

Thank you Olivier for your prompt answer and clarification.

Best,
Asma

Hi,

I am new user of MadGraph5 and i need to understand how to import another particle to the DY-SM model.

Iam trying to generate events for new particle with varouis masses , 200 , 500, 1000 ..... 4500 GeV and from my little knowledge till now: I can go to Models folder then edit manually the file "particles.py" by adding its pdg code and edit the below example as needed: (can I insert a new symbol to the particles or what is the steps to add a new particles ???)

"MY_PARTICLE" = Particle(pdg_code = XXXX,
              name = 'MY_PARTICLE',
              antiname = 'MY_PARTICLE~',
              spin = 0,
              color = 1,
              mass = Param.ZERO,
              width = Param.ZERO,
              texname = 'MY_PARTICLE',
              antitexname = 'MY_PARTICLE',
              charge = 0,
              LeptonNumber = 1,
              GhostNumber = 0)

Thanks,

Mai