Empty root file outputte using Delphes with MadGraph

[Xanthe Hoad]

Hi,

I'm using MadGraph5 2.2.2 with Delphes install. When I try to launch with Delphes to produce events, the tag_#_delphes_events.root is empty. From the log file:

** INFO: initializing module  PileUpMerger             
** ERROR: can't open pile-up file MinBias.pileup
** Reading delphes.root
Error in <TChain::LoadTree>: Cannot find tree with name Delphes in file delphes.root
** Input file contains 0 events
** Exiting...

I asked the MadGraph authors ​https://answers.launchpad.net/mg5amcnlo/+question/258784 and they didn't know a solution and suggested I ask here. Any suggestions would be appreciated.

Best wishes,
Xanthe Hoad

[Pavel Demin]

With the MadGraph developers, we've checked that the latest
MadGraph5_aMC@NLO version (v2.2.2) includes correct configuration file.

I've just tried the following:

wget https://launchpad.net/mg5amcnlo/2.0/2.2.0/+download/MG5_aMC_v2.2.2.tar.gz
tar zxf MG5_aMC_v2.2.2.tar.gz
cd MG5_aMC_v2_2_2
./bin/mg5_aMC
install Delphes
install pythia-pgs
generate p p > z > e+ e-
launch
exit
tail PROC_sm_0/Events/run_01/tag_1_delphes.log

Delphes log file is OK:

** Reading pythia_events.hep
** [################################################################] (100.00%)
** Exiting...
** Reading delphes.root
** Input file contains 10000 events
** [################################################################] (100.00%)
** Exiting...

Default MadGraph5_aMC@NLO_v2.2.2 configuration works with Delphes without any problem.

Closing this ticket.