MadGraph5_aMC@NLO

FKS5 Interface and LHAPDF

Asked by Sinan Kuday

Hi,
I'd like to calculate some loop diagrams using loop_sm model generating p p > h h [virt=QCD]. But i am getting the following error: InvalidCmd : When running ML5 standalone, multiparticle labels cannot be employed. Please use the FKS5 interface instead.

I have already set all paths in the configuration file. How can i run FKS5 interface?

Thanks in advance...

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MadGraph5_aMC@NLO Edit question
Assignee:
Valentin Hirschi Edit question
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Valentin Hirschi (valentin-hirschi) said : 		#1

Hi Sinan,

If you want to use MadLoop in standalone mode, you can only specify specific processes *not* involving multiparticle labels such as 'p' or 'j'. In your case, you can type in:

generate g g > h h [virt=QCD]

Notice however that this is a loop induced process so that in the current version some optimizations are off and the code my not be as fast as it will eventually be once we will have brought these optimizations back in for this class of process.
If what you wanted is instead the QCD correction on top of the Higgs effective theory (which has the point like vertex g g h h with the fermion quark loop integrated out) then the corresponding model is not yet included in the public version.

Finally, notice that even though multiparticle labels are not supported, you can still output several processes at once using the syntax

generate <process_1> @1
add process <process_2> @2
add process <process_3> @3
...
output <AllMyProc>

And you will have all the processes added together in the same AllMyProc output.

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