The Phase for doubly chargino

[xiekeping]

Dear Florian,

I emailed you once to point it out the phase of doubly chargino in SUSY triplet model. This is not a problem if the observable is determined by the absolute value of couplings, such as decay. But for the loop correction to W, it will create a problem when it involve only one doubly charginos in the loop, similar case will happen to the scalar mass corrections. I have checked the SPheno code, the coupling does not involve this phase at all, even I have defined it in my SARAH model files (MODEL.m and parameters.m). I have also checked the expression shown in the PDF file produced by .TeX. It is also not there. But in the gluoninos, case, there is a factor as \phi_g etc. It means the gluoninos phase is well treated, but the doubly charginos phase is not.

In my triplet model, I have checked this problem indeed existed. For example, when I tune my parameter inputs to make sure the phase is positive 1, then I can get a very small rho parameter correction, such as
dmz2 ( 3157.7652071784751 , 0.0000000000000000 ) dmw2 ( 2392.8434548988980 , 0.0000000000000000 ) drho 9.4488524926579220E-003

But if the phase is negative, I will get a extremely large rho correction,
dmz2 ( 2601.4467309830602 , 0.0000000000000000 ) dmw2 ( 78915.313202535850 , 0.0000000000000000 ) drho -11.899876179099746

Just look at these numbers, I would say it is because the phase is not well dealt with in W self energy correction. While Z self energy is fine because it involve either no doubly charginos or 2 doubly charginos. That is to say, Z self energy is related to |\phi|^2, while W self energy is related to \phi. And this is where the large W mass correction correction comes from, 1~2 magnitude larger than Z self energy corrections.

So, Florian, can you point it out to me how can I mimic the treatment of gluonino phase to fix this problem in the SPheno package file. I suppose it is in SPheno.m or SPhenoCoupling.m.

Best regards,
Keping

[xiekeping]

Hi Florian,

Sorry for this bothering. I have tried it out the solution for this problem. The answer lies that I have to rerun all the part of the SARAH codes from the beginning, not just generating the SPheno code part. The key point seems to the following steps.

ModelOutput[EWSB, VerticesForLoops -> True];
CalcLoopCorrections[EWSB];

Thanks all the same.

Best regards,
Keping

[FStaub]

Sorry for the delayed reply. Yes, after changing the model files one needs to recalculate all vertices.

Cheers
Florian