FeynRules-Branching_Ratio

Did you look at the dedicated paper?
 arXiv:1402.1178

They are more information that in the FR manual.
In top of that I have open a ticket on the FR website with a copy-paste of your question:
https://feynrules.irmp.ucl.ac.be/ticket/104

Cheers,

Olivier

[cc of the answer of the FR website]

Hi Olivier, Daniel,

You need to closely follow what is in the manual:
 1) rules = FeynmanRules[yourlagrangian];
 2) decay = ComputeWidth[rules]
 3) BranchingRatio[yourprocess] with yourprocess being of the form {A,B,C}.
Then, you get a number. If this is not the case, there is maybe an issue with the model file or some parameters may not be provided with a numerical value.

Cheers,

Benjamin

Hi, yes I was trying to do it, but the outcome is the following :

>BranchingRatio[{HG, Y1, HC[Y1]}]

Decay::NumMass: Mass is not numerical. Cannot decide whether decay channel is open.

(2.76845*10^26 NumericalValue[Null])/(1.87337*10^23 -
   5.57152*10^18 NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[2]\), \(PRIVATE`eext[
       2]\)]\)] NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[2]\),
SubscriptBox[\("\[Mu]"\), \(2\)]]\)] - 5.57152*10^18 NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[3]\), \(PRIVATE`eext[
       3]\)]\)] NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[3]\),
SubscriptBox[\("\[Mu]"\), \(3\)]]\)] + 1.67511*10^14 NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[2]\), \(PRIVATE`eext[
       2]\)]\)] NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[2]\),
SubscriptBox[\("\[Mu]"\), \(2\)]]\)] NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[3]\), \(PRIVATE`eext[
       3]\)]\)] NumericalValue[
\!\(\*SubsuperscriptBox[\("p"\), \(Ext[3]\),
SubscriptBox[\("\[Mu]"\), \(3\)]]\)])^1.

What do you think? Thanks.

Daniel

Hi Daniel,

It seems that not all the numerical value of the masses of your particles are provided. Please make sure that all the masses are numerically fixed. This will solve the problem.

Cheers,

Benjamin

Hi Benjamin,

I reviewed all the parameters values and coupling constants in the implementation of the model and up to now I am sure that all of them have numerical values. Now, I ran again the FeynRules package and the result was for the BranchingRatio[{HG, X1, HC[X1]}] the following:

Decay::NumMass: Mass is not numerical. Cannot decide whether decay channel is open.
Out[20]=
                 0.000263142 NumericalValue[Null]

Similarly to the PartialWidth[{HG, X1, HC[X1]}] that is,
Decay::NumMass: Mass is not numerical. Cannot decide whether decay channel is open.

Thanks for any hint...

Hello,

Could you please provide some material to reproduce your issue (mathematica notebook, model file, etc...)

Cheers,

Benjamin

Hi,

of course! what do you need? and which mail I can send it?

Cheers,

daniel

Hi

I need a mathematica notebook which shows the problem + the FR model file.

Best,

Benjamin

PS: you can use my CERN e-mail address (fuks_at_cern.ch)

I mean, Daniel, not David... Sorry.

Thanks a lot!

Thanks Benjamin Fuks, that solved my question.