Problem when using SPheno and Whizard

[Jordan]

Hello Florian,

Sorry for the question which is probably trivial.

I have some problems with SPheno created by SARAH. I want to use SPheno with Whizard but SPheno can't create the whizard.par file. When i put the flag 75 --> 1, SPheno tell me that it does not recognize the entries.
I have also tried to use SSP but whizard can't find the entries, and I suppose it's because none whizard.par file is created.

I have others problems too. I have created a SPhenoMSSM and a WhizardMSSM but SPhenoMSSM give me always negative squared masses. I'm using it with flavour violating (maybe this is the problem ?).
A last thing, when i had start the butler to create MSSM model, my terminal froze at this step : parameters.mssm_sarah.cpl3.f90 -fPIC -o parameters.mssm_sarah.cpl3.o.


Thanks for your time,
Jordan

[FStaub]

Hi,

I attach an input which produces the WHIZARD.par file which I also attach if you run it with SPhenoMSSM. Does this work for you?

A last thing, when i had start the butler to create MSSM model, my terminal froze at this step : parameters.mssm_sarah.cpl3.f90 -fPIC -o parameters.mssm_sarah.cpl3.o.

Yes, compiling the files can take a lot of memory. In that case, it's helpful to reduce the numbers per couplings per file via

Code: Select all

MakeWHIZARD[MaximalCouplingsPerFile -> 50]

You can change that by default in SARAH.config if you want to use that option with butler.

Cheers,
Florian

[Jordan]

Hi,

Thanks for your answer.

Your file works perfectly with my SPhenoMSSM and create the WHIZARD.par file. But i don't understand why my file does not work : When I use SPheno it's fine and i get coherent output but when i use SPhenoMSSM i get negative squared masses and the program stop.

Ok for the butler, i will configure it.

Thanks again,
Jordanfile:///home1/bernigaud/LesHouches.in

[FStaub]

Hi,

good so far. Just, your file hasn't been attached correctly.

Cheers,
Florian

[Jordan]

Oops,

Sorry.

[FStaub]

Hi,

the problem is that SARAH generated SPheno version don't support EXTPAR[26]: this corresponds to the pole mass M_A, and it therefore translated by the spectrum generators into the tree-mass which is needed for the other calculations. While this translation is straightforward in the MSSM, it's not for models with extended Higgs sectors. Therefore, SPheno by SARAH version can only be used with bar quantities as input. If I use your file with

Code: Select all

 24  1.000000e+06                # MA2

what defined the tree-level value of M_A^2, I get a spectrum.

Cheers,
Florian

[FStaub]

Hi again,

actually, I think I can already guess your next question: why does M_A^2 = (600 GeV)^2 not produce a spectrum. I was wondering myself about and checked what's going on: SPheno calculates form M_A^2 the value of B_mu at the SUSY scale, i.e. B_mu(M_SUSY)=5 10^5. Running this value down to M_Z in order to make the matching between SM and MSSM, gives B_mu = - 4 10^5, and this results in negative M_A and M_H^+.
The approach of the stand-alone SPheno is a bit different: first, it translates M_A into B_mu, and then it takes mu and B_mu to get m_Hd^2 and m_Hu^2. When running down to M_Z, it doesn't run \mu and B_mu, but m_Hd^2 and m_Hu^2 and gets the values for mu, B_\mu from the tadpoles at M_Z. In principle, both approaches should be equivalent because the differences should be a higher order effect. However, for your particular point this seems to play a crucial roles and means that it is kind of fine-tuned.

Cheers,
Florian

[Jordan]

Hi,

You're right ! I will now try to use SSP.
Thanks a lot for helping me !

Cheers,
Jordan

[Jordan]

Okay, you're probably right.

In fact this is not a problem, this set of parameters is just a toy model to understand how flavour violation is acting on masses and Branching ratios.

Thanks again,
Jordan

[FStaub]

Ok, great. Than you can just take large enough values for M_A^2 and things should work fine now - hopefully.

Cheers,
Florian