Problem with addmasses.py when running gridpack

Hi,

The addmasses script is actually run only in gridpack mode. This code was developed by Stephen Mrenna and
I’m not an expert at all in that code. However it seems to fail due to a problem of energy conservation of the order of 1 GeV.

Such large error should be visible in your LHE file. Could you check if you have this problem both for the lhe file runned locally and the on from the gridpack?

Additionally, Which version of the code did you run?

Cheers,

Olivier

On Apr 29, 2014, at 12:51 PM, Koen Oussoren <email address hidden> wrote:

> New question #247869 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/247869
>
> Hi,
>
> I prepared a gridpackage for a proces made with the HC_UFO model. When I just generate events locally, so before making the gridpack, everything looks alright and I get my events.
>
> After making the gridpackage and running run.sh I get the following message after the events.lhe is created:
>
> Moving events from events.lhe
> Running addmasses.py to add masses and correct kinematics of fixed particles
> Event does not pass tolerance 0.0001
> | 1.2677070032E+00 2.2018480501E+01 -7.5569191263E+02 7.6019716588E+02 7.9643227121E+01 |
> Event does not pass tolerance 0.0001
> | -4.4170293794E+00 -1.6229101238E+01 -1.5229360271E+02 1.7312959026E+02 8.0607814276E+01 |
> Event does not pass tolerance 0.0001
>
> This goes own for pretty much all my events. I guess that addmasses.py (bin/internal/addmasses.py) is performing some kinda
> check but the pass tolerance is exceeded. What is this supposed to mean? I don't get this message when I do a normal bin/generate_events locally. Even with this message I still get my events.lhe file, but I'm not sure if the particles in the events have the proper kinematics. So what to do with it?
>
> Cheers,
> Koen
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier,

I checked the .lhe files for the gridpack and locally, but I don't see significant differences.

I used version 5.2.0.1

So this might be a problem with the addmasses.py script, that when it tries to restore some masses it fails to do so.
I would suggest to either remove that script from your gridpack (then he is not run).
Or contact Stephen Mrenna for more details on this code.

Cheers,

Olivier

On Apr 30, 2014, at 11:56 AM, Koen Oussoren <email address hidden> wrote:

> Question #247869 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/247869
>
> Koen Oussoren posted a new comment:
> Hi Olivier,
>
> I checked the .lhe files for the gridpack and locally, but I don't see
> significant differences.
>
> I used version 5.2.0.1
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.