Pythia8 Problem at NLO

[Alberto Rescia]

Hi,

I am trying to generate a process at NLO using MG5 v3.5.0.

The process is p p > b b~ l+ l- [QCD]. I would like to include Delta matching, but the error happens whether I set this to true or false in the run card.

When the shower starts I get the following messages:

INFO: Compiling MCatNLO for PYTHIA8...
INFO: ... done
INFO: Showering events...
INFO: (Running in /home/alberto/Documents/phd/zhf/14giugno_nlobbll/MCatNLO/RUN_PYTHIA8_2)
INFO: Idle: 1, Running: 0, Completed: 0 [ current time: 13h49 ]
mv: cannot stat 'Pythia8.hep': No such file or directory
gzip: events.hepmc: No such file or directory
INFO: Idle: 0, Running: 0, Completed: 1 [ 0.25s ]
Error detected in "launch "
write debug file /home/alberto/Documents/phd/zhf/14giugno_nlobbll/run_02_tag_1_debug.log
If you need help with this issue, please, contact us on https://answers.launchpad.net/mg5amcnlo
str : No file has been generated, an error occurred. More information in /home/alberto/Documents/phd/zhf/14giugno_nlobbll/bin/amcatnlo_run.log.

When looking at the debug file (attached below), it seems that the programme is searching for a hepmc file which is not present. The strange part is that, if I try to generate this process and shower it at LO, the hepmc file containing the showered events is correctly generated.

Do you have any idea what is going on? Thanks in advance for your help.

Cheers,
Alberto

[Olivier Mattelaer (olivier-mattelaer)]

Do you have the content of the following file:
/home/alberto/Documents/phd/zhf/14giugno_nlobbll/bin/amcatnlo_run.log

Cheers,

Olivier

[Alberto Rescia (arescia)]

Hi Olivier,

unfortunately that file is empty.
I've also just checked more deeply, and it seems that although the hepmc file is generated at LO, it is also empty.

Cheers,
Alberto