SARAH-SPheno compiling error

[lichuang]

Hello Florian,
I am a student from China ITP. I work with Bin Zhu.
Bin created a model named DiracTMSSMLow, see the attachment.
Under toolbox 2.0.1 or 2.0.3, We did the following steps:
1) write a Mathematica nb file to make spheno/chep files(according to 1109.5147v1)
SetDirectory[...];
<< SARAH.m;
<< Start["DiracTMSSMLow"];
MakeSPheno[];
MakeCHep[];
Copy SARAH/Output/DiracTMSSMLow/EWSB/SPheno/ to a new subdirectory "DiracTMSSMLow" of SPheno-3.3.8 directory.
2) In the main directory of SPheno-3.3.8, compile the model by using
make Model=DiracTMSSMLow
3) then, we got a compiling error in the following file:
RGEs_DiracTMSSMLow.f90.
We should manually modify all the betaLup1 and betaLup2 equal to 0 to remove the error.

Then, I checked the mathematica codes of SARAH/Package/SPheno/SPhenoRGE.m, found a problem, modified it from the programming point of view, and it can work now. But I don't know the reason from the Physical point of view. See the attachment.

I hope you can solve it in a better way, or just patch it by my way.

Best Regards!
Chuang Li
ITP of CAS at Beijing, China

[FStaub]

Dear Chuang,

thank you for your files and efforts to pin down the problem yourself. From the physical point of view the origin of the problem is that you mix a SUSY model with additional terms in the potential to incorporate the non-decoupling effects. In the presence of these terms the RGE calculation for the SUSY parameters is actually not valid because SUSY relations will get spoilt by the non-SUSY terms. And this reflects in the errors you see.

I think for your study this won't be a big problem because you'll most-likely study the model only at the low scale without RGE running. So, I guess your patch is going to work. I just wonder if I really should include it in the public version because this will hide the problem mentioned above and people might then do studies which are no longer well defined because they are not aware of the problem. Let me think further about this.

Best,
Florian

[lichuang]

Hi, Florian,
Thanks for your reply!
Yes, from the physical point of view, I think you are right: "...this will hide the problem mentioned above and people might then do studies which are no longer well defined because they are not aware of the problem".
This indeed is not a big problem for my study, it depends on your balance.
Best Regards!