MadGraph5_aMC@NLO

Problems in X2to2a special code

Asked by Florian Bernlochner

Hello,

I have a problem running the X2to2a special code (to produce pp -> (2+) +X w/ (2+) -> gam gam.

The LO code runs fine, but when running the NLO code, I get the following output

[...]
ERROR: not all jobs terminated correctly
ERROR: not all jobs terminated correctly
INFO: Return code of the event collection: None
INFO: Output of the event collection:
N of directories: 6
Determining the number of unweighted events per channel
1 jobs did not terminate correctly
P0_gg_aa_no_x0x1/GV1
Found 5 correctly terminated jobs
5 6
Integrated abs(cross-section)
P0_uxu_aa_no_x0x1/GF1/res_0: Final result [ABS]: 44.583030191049254 +/- 0.25208152278355228
1 jobs did not terminate correctly
P0_gg_aa_no_x0x1/GV1
Found 5 correctly terminated jobs
5 6
Integrated cross-section
P0_uxu_aa_no_x0x1/GF1/res_0: Final result: 41.736563518956871 +/- 0.28360129787955146
Error detected in "launch "
write debug file /afs/cern.ch/work/f/florianb/sw/X2to2a/run_06_tag_1_debug.log
If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
aMCatNLOError : An error occurred during the collection of results
quit
[...]

The log file in P0_gg_aa_no_x0x1/GV1 reveals that there is a problem with the pole cancelations, i.e.

[...]
POLES MISCANCELLATION, DIFFERENCE > 9.99999999999999955E-007
  COEFFICIENT DOUBLE POLE:
        MadFKS: -0.75491853280166710 OLP: -0.75491853280166710
  COEFFICIENT SINGLE POLE:
        MadFKS: -0.80576024273344515 OLP: -0.72188040575548207
  FINITE:
           OLP: 0.71820886301615061
  Trying another PS point
[...]
  TOO MANY FAILURES, QUITTING

I'm running the code out of the box with LHAPDF version lhapdf-5.8.9 (the built in PDFs are used in the above run) and fastjet-3.0.4. The following option was used

generate_events -p (no showering)

I also installed MadGraph5_v2.0.0.beta3 and linked it accordingly in the config file of the X2to2a code.

I tried running the X2to4l code as well. Here I have no problems and can produce a LHE file.

Thanks for your help,
Florian

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Rikkert Frederix Edit question
Last query:
Last reply:
Revision history for this message
Rikkert Frederix (frederix) said : 		#1

Dear Florian,

Thanks for reporting. We already discovered this last week, and are working on fixing this. I'll let you know when this is done.

Best,
Rikkert

Revision history for this message
Florian Bernlochner (florian-bernlochner) said : 		#2

Hi Rikkert,

thanks a lot! Is there any news on this?

Cheers,
Florian

Revision history for this message
Rikkert Frederix (frederix) said : 		#3

Dear Florian,

Sorry for the rather long delay. Finally, we have fixed this problem and updated the codes on the amcatnlo webpage.

Please, let us know if there are other problems.

Kind regards,
Rikkert

Can you help with this problem?

Provide an answer of your own, or ask Florian Bernlochner for more information if necessary.

To post a message you must log in.