That's weird. Are you using the same version of mg5 as me (version 2.6.8)?

Cheers,

B>

> On 16 Oct 2020, at 09:33 , Olivier Mattelaer <email address hidden> wrote:
> 
> In my case when trying to generate tthose loops they fail to generate
> with:
> 
> Command "check  d d~ > s s~ NP=2 QCD=0 QED=0 [QCD]" interrupted with error:
> ValueError : -5 is not in list
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
> 
> Cheers,
> 
> Olivier
> 
>> On 16 Oct 2020, at 08:09, Benjamin Fuks <email address hidden> wrote:
>> 
>> Hi Olivier,
>> 
>> Any news here? Is there anything I could do on my side?
>> 
>> Cheers,
>> 
>> Benj
>> 
>> -- 
>> You received this bug notification because you are subscribed to
>> MadGraph5_aMC@NLO.
>> https://bugs.launchpad.net/bugs/1899608
>> 
>> Title:
>> Fermion flow issue in the loops
>> 
>> Status in MadGraph5_aMC@NLO:
>> New
>> 
>> Bug description:
>> Hi everyone,
>> 
>> We are performing some new physics calculations in a model where the
>> SM is extended by a squark (and an invisible state that is irrelevant
>> for our purpose). The UFO is provided in attachment. The process of
>> interest consists in dijet production. I use MG5_aMC 2.6.8 and as a
>> process definition, I typed
>> 
>> import model RPVMono_UFO_RG-paper
>> set complex_mass_scheme True
>> generate p p > j j NP=2 QCD=0 QED=0 [QCD]
>> output
>> 
>> In order to solely get QCD corrections to the new physics component, I have modified the madgraph/loop/loop_diagram_generation.py file. I have set the filtering to true (around l388)
>>     edit_filter_manually = True
>> and then included
>>     loop_pdgs = [abs(x) for x in diag.get_loop_lines_pdgs()]
>>     is_loop_gluon  = (21 in loop_pdgs)
>>     is_loop_sigma  = (9000002 in loop_pdgs)
>>     if is_loop_sigma and not is_loop_gluon:
>>         valid_diag=False
>> I get the needed diagrams (so that this works). 
>> 
>> However, when launching a cross section calculation, I get a pole non-cancellation issue. The weird thing is that poles are fine for the subprocesses
>>   d dbar to s sbar    or     s sbar to d dbar
>> but not for the subprocess
>>   dbar d to s sbar
>> This is weird as the diagrams are exactly the same. I suspect something problematic with the fermion flow here (as we have clashing arrows diagrams). Any thoughts?
>> 
>> Cheers,
>> 
>> Benj
>> 
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/mg5amcnlo/+bug/1899608/+subscriptions
> 
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1899608
> 
> Title:
>  Fermion flow issue in the loops
> 
> Status in MadGraph5_aMC@NLO:
>  New
> 
> Bug description:
>  Hi everyone,
> 
>  We are performing some new physics calculations in a model where the
>  SM is extended by a squark (and an invisible state that is irrelevant
>  for our purpose). The UFO is provided in attachment. The process of
>  interest consists in dijet production. I use MG5_aMC 2.6.8 and as a
>  process definition, I typed
> 
>  import model RPVMono_UFO_RG-paper
>  set complex_mass_scheme True
>  generate p p > j j NP=2 QCD=0 QED=0 [QCD]
>  output
> 
>  In order to solely get QCD corrections to the new physics component, I have modified the madgraph/loop/loop_diagram_generation.py file. I have set the filtering to true (around l388)
>      edit_filter_manually = True
>  and then included
>      loop_pdgs = [abs(x) for x in diag.get_loop_lines_pdgs()]
>      is_loop_gluon  = (21 in loop_pdgs)
>      is_loop_sigma  = (9000002 in loop_pdgs)
>      if is_loop_sigma and not is_loop_gluon:
>          valid_diag=False
>  I get the needed diagrams (so that this works). 
> 
>  However, when launching a cross section calculation, I get a pole non-cancellation issue. The weird thing is that poles are fine for the subprocesses
>    d dbar to s sbar    or     s sbar to d dbar
>  but not for the subprocess
>    dbar d to s sbar
>  This is weird as the diagrams are exactly the same. I suspect something problematic with the fermion flow here (as we have clashing arrows diagrams). Any thoughts?
> 
>  Cheers,
> 
>  Benj
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1899608/+subscriptions