Hi,

So in principle the fix that I mention should fix the problem.

Cheers,

Olivier


On 27 Jun 2015, at 17:00, Khaled Teilab <email address hidden> wrote:

> Hello Olivier,
> actually -apart from the form factor- both models are exactly the same
> ...and... for the same process model1 produces very reasonable results !!!
> MG only fails to calculate the process when form factors are included.
> Cheers,
> Khaled
> 
> On 27.06.2015 16:59, Olivier Mattelaer wrote:
>> Dear Khaled,
>> 
>> I have not try model1 so i can not comment on it.
>> When I ran model3 after the modification that I mention before. MG refuses to make the computation for the process that you mention 
>> because it can not handle it. This is process specific, so it is possible that you test for another process, I do not know but if they are indeed the same model then I would expect both to fail.
>> 
>> Cheers,
>> 
>> Olivier
>> 
>> 
>> 
> 
> -- 
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1468429
> 
> Title:
>  Form factors with transposed spinors bug
> 
> Status in MadGraph5_aMC@NLO Generator:
>  Won't Fix
> 
> Bug description:
>  Hi,
>  I try to include a form factor in a model having two scalar particles (sig, phi) and two fermions (f1 and f2).
>  The lagrangian used in feynrules looks like: 
>  g_1 Inner[Dot,Inner[Dot,{f1bar,f2bar  },sig  IdentityMatrix[2]],{f1,f2  }] + I g_2 (phi(CC[f1bar].Ga[5].f1) + anti[phi](f1bar.Ga[5].CC[f1]))
> 
>  In the attachment you find four models:
>  1) Model1: Includes ALL     vertices coming from the above Lagrangian WITHOUT form factor => WORKS
>  2) Model4: Includes ONLY  vertices involving the sig particle                     WITH         form factor => WORKS
>  3) Model2: Includes ALL     vertices coming from the above Lagrangian  WITH form factor on ALL vertices => FAILS to produce output folder
>  4) Model3: Includes ALL     vertices coming from the above Lagrangian  WITH form factor on ONLY vertices involving the sig particle => FAILS to poruce output folder
> 
>  The output looks like:
> 
>  INFO: initialize a new directory: model3test 
>  INFO: remove old information in model3test 
>  INFO: Organizing processes into subprocess groups 
>  INFO: Generating Helas calls for process: f1+ f1+ > f1+ f1+ WEIGHTED=2 
>  INFO: Processing color information for process: f1+ f1+ > f1+ f1+  
>  INFO: Creating files in directory P0_f1pf1p_f1pf1p 
>  INFO: Generating Feynman diagrams for Process: f1+ f1+ > f1+ f1+ WEIGHTED=2 
>  INFO: Finding symmetric diagrams for subprocess group f1pf1p_f1pf1p 
>  History written to /home/teilab/mg/model3test/Cards/proc_card_mg5.dat
>  Generated helas calls for 1 subprocesses (3 diagrams) in 0.011 s
>  Wrote files for 12 helas calls in 0.154 s
>  Export UFO model to MG4 format
>  CRITICAL: aS not define as external parameter adding it! 
>  WARNING:  aEWM1 and Gf not define in MODEL. AQED will not be written correcty in LHE FILE 
>  ALOHA: aloha creates FFS2 routines
>  Command "output model3test" interrupted with error:
>  NameError : name 'exp' is not defined
>  Please report this bug on https://bugs.launchpad.net/madgraph5
>  More information is found in 'MG5_debug'.
>  Please attach this file to your report.
> 
>  Could you please have a look at the attached models and tell me what
>  the problem is? The debug file is also attached
> 
>  Thanks,
>  Khaled
> 
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