Comment 6 for bug 1899608

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