aMC@NLO v2.3.0: g g > z h

Hi Carlo,

This initialization does not crash on my computer, so that I cannot reproduce your problem. I would then need some more information to help you with this issue.

First, can you confirm that you can generate events for a simpler process, such as g g > h [QCD] for example, without any problem?
Also, if you cd to the MadLoop output directory:
/afs/cern.ch/work/c/cpandini/mcgen/testdir/MG5_aMC_v2_3_0_beta/outdir_ggzh_test_1/SubProcesses/PV0_0_1_gg_zh
And try to run by hand the standalone MadLoop executable './check'. Please report errors in that execution if any.

Thanks for the feedback

Hi aMC@NLO authors,

I am experiencing the same error reported in the previous mail and mine reported here (*).

I am generating, using the loop induced method, the following process: g g> h > l+ l- vl~ vl / z a [QCD]
Before this I have generated other processes without any problem, like g g > l+ l- vl~ vl [QCD] or g g > h > l+ l- vl~ vl / w+ [QCD].

As suggested above I have tried to run by hand the standalone MadLoop executable but during the make I receive an error and I can't check anything; the error is reported here (**)

The python version is: Python 2.7.5
the gcc and gfortran version is: 4.9.1

Thank you very much for the help and regards,
 Alessio

(*)

Generating 1000000 events with run name run_01
survey run_01
INFO: compile directory
initMadLoop -f
Initializing MadLoop loop-induced matrix elements (this can take some time)...
root: Error while executing make in /nfs/home/fynu/amagitteri/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/SubProcesses/PV0_0_1_gg_h_epveemvex_no_z
root: Failed at running the process in /nfs/home/fynu/amagitteri/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/SubProcesses/PV0_0_1_gg_h_epveemvex_no_z.
Error detected in "generate_events "
write debug file /nfs/home/fynu/amagitteri/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/run_01_tag_1_debug.log
If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
MadGraph5Error : Failed the initialization of loop-induced matrix element 'PV0_0_1_gg_h_epveemvex_no_z' (trying with a maximum of 15 PS points).
quit

(**)

amagitteri@ingrid-ui1:~/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/SubProcesses/PV0_0_1_gg_h_epveemvex_no_z> make
cd ..; make -f makefile_MadLoop OLP_static
make[1]: Entering directory `/nfs/home/fynu/amagitteri/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/SubProcesses'
gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -c PV0_0_1_gg_h_epveemvex_no_z/loop_num.f -o PV0_0_1_gg_h_epveemvex_no_z/loop_num.o
cts_mprec.h:1.9:
    Included at PV0_0_1_gg_h_epveemvex_no_z/loop_num.f:38:

      USE MPMODULE
         1
Fatal Error: Cannot read module file 'mpmodule.mod' opened at (1), because it was created by a different version of GNU Fortran
make[1]: *** [PV0_0_1_gg_h_epveemvex_no_z/loop_num.o] Error 1
make[1]: Leaving directory `/nfs/home/fynu/amagitteri/Collider_Codes/Event_Generator/MG5_aMC_v2_3_0_beta/gg_H_To_WW_2l2nu/SubProcesses'
make: *** [libMadLoop.a] Error 2

Hi Carlo,

Do you have the same issue as Alessio when trying to compile the process by hand (i.e. typing make in the PV0*) directory?

Now, Alessio, the error you reported:

Fatal Error: Cannot read module file 'mpmodule.mod' opened at (1), because it was created by a different version of GNU Fortran

Typically occurs when the compiler changed since the last time CutTools was compiled.
Could you try again g g > h [QCD] after having recompiled CutTools by going to:

cd <MG_distribution>/vendor/CutTools
make clean
make

Let me know

Hi Carlo,

Do you have the same issue as Alessio when trying to compile the process by hand (i.e. typing make in the PV0*) directory?

Now, Alessio, the error you reported:

Fatal Error: Cannot read module file 'mpmodule.mod' opened at (1), because it was created by a different version of GNU Fortran

Typically occurs when the compiler changed since the last time CutTools was compiled.
Could you try again g g > h [QCD] after having recompiled CutTools by going to:

cd <MG_distribution>/vendor/CutTools
make clean
make

Let me know

Hi Valentin,

Many thanks!

I have done as you suggested ( open vendor dir, make clean and then make); I resubmitted all the steps (generation of the diagrams and events) and it is working properly now.

So, may I conclude that the best things ever to do, after the downloading of aMC@NLO tar, is a ri-compiletion of the code inside the framework that is in used?
In this case what parts have to be re-compiled?

Cheers,
Alessio

Hi Valentin and Alession,
I'm sorry I never followed up on this issue.
I eventually solved my problem just by setting up a different version of the compiler, using
gcc 4.8.1
and
python 2.7.3

(which I see are different wrt one used by Alessio).

I didn't find any issues and I can complete the test run:
  > generate g g > z h [QCD]
 > output outdir
 > launch

without any compilation issues.
I hope this can be useful.

Cheers,
 Carlo

I get a similar error message, "Failed the initialization of loop-induced matrix element"

When I run ./check for the SubProcess, I get a warning message, "inconsistent zero helicity". I was not sure what this could indicate.

Thanks

Chris