Assignment of kinematics at FO
Hello everyone,
this is a (yet another) followup about running NLO FO calculations with a LHE output.
I get in the lhe file some phase space points I did not expect.
For instance, when running the process:
p p > t t~ QCD=2 QED=0 [QCD]
with all settings left to their default values, i got:
<event>
4 0 -7.7034287e-05 0.00000000e+00 0.00000000e+00 0.00000000e+00
21 -1 0 0 599 599 +0.0000000000e+00 +0.0000000000e+00 +2.2624600942e+03 2.2624600942e+03 0.0000000000e+00 0.0000e+00 9.0000e+00
2 -1 0 0 599 599 +0.0000000000e+00 +0.0000000000e+00 -2.3142377606e+03 2.3142377606e+03 0.0000000000e+00 0.0000e+00 9.0000e+00
6 1 0 0 599 599 +3.7398442496e+02 +7.9711327642e+02 +2.0792477093e+03 2.2645328353e+03 1.7200000000e+02 0.0000e+00 9.0000e+00
-6 1 0 0 599 599 -3.7398442496e+02 -7.9711327642e+02 -2.1310253757e+03 2.3121650195e+03 1.7200000000e+02 0.0000e+00 9.0000e+00
#aMCatNLO 0 0 0 0 0 0.00000000D+00 0.00000000D+00 9 5 0 0.00000000D+00 0.00000000D+00 0.00000000D+00 0.00000000D+00 0.20000000D+01
</event>
The process q g > q q should definitely not be happening here, so I assume there have been some problems with the assignment of momenta or pdg codes. For context, this event is part of an eventgroup, with the counter-event being the expected real-emission process (21 2) -> (6 -6 2).
Can you please confirm what is happening?
Thanks a lot,
Claudio
Question information
- Language:
- English Edit question
- Status:
- Solved
- Assignee:
- Rikkert Frederix Edit question
- Solved by:
- Rikkert Frederix
- Solved:
- Last query:
- Last reply:
- Whiteboard:
- Hi Rik, I doubt that this is specific to the lhe output (looks like this is coming directly out of the ipdg block from the fill_analysis. I guess taht the issue is indeed that the pdg code for initial particle is not correctly set when passed to the "outfun" routine. What do you think?