Comment 4 for bug 1794543

Hi,

> P.S: forget about the ickkw = 1 option in the run_card for the MLM
> scheme. I just realised this is only available when importing a LO
> model, but not when importing the corresponding NLO model and running at
> LO+PS

That's not true. You can run LO+PS and set up MLM (or CKKW-L) even if the model is NLO.
But in that case, your process should not request ANY NLO contribution.
i.e. you can do

import loop_sm
generate p p > t t~
add process p p > t t~ j
output
launch

In that case, ickkw is actually automatically set to one.

> at NLO I only have to set the ickkw parameter in the run_card to its
> value and the corresponding Qcut and njetmax FxFx parameters in the
> shower_card. Is that right?

Don't you have also to add the veto cut inside the parton-shower?

Cheers,

Olivier

> On 27 Sep 2018, at 11:11, Pablo Martin <email address hidden> wrote:
>
> P.S: forget about the ickkw = 1 option in the run_card for the MLM
> scheme. I just realised this is only available when importing a LO
> model, but not when importing the corresponding NLO model and running at
> LO+PS
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1794543
>
> Title:
> install mg5amc_py8_interface linking to local pythia installation
>
> Status in MadGraph5_aMC@NLO:
> New
>
> Bug description:
> Hi Olivier,
>
> I am doing some work with MG5 at NLO. I would like to know how to
> install the mg5amc_py8_interface and link it to a local pythia
> installation.
>
> I can correctly set the pythia8_path in the mg5 configuration file,
> but the script compile.py in HEPTools/MG5aMC_PY8_interface assumes
> that Makefile.inc is in pythia8235/, but in my pythi installation is
> by default in pythia8/share/Pythia8/examples/. This problem has
> already been presented in this thread:
>
> https://bugs.launchpad.net/mg5amcnlo/+bug/1674095
>
> How should I modify the script to make it work? I want to run a NLO+PS
> with FxFx matching and merging and would like to be able to use this
> interface.
>
> I am actually more interested in using the default pythia8
> installation within madgraph5, but I already had some problems before
> due to a missing iostreams library, which I reported in this thread:
>
> https://bugs.launchpad.net/mg5amcnlo/+bug/1779081
>
> and Marco suggested to try an external pythia8 installation. I have
> tried to understand the problem in this last thread and I still don't
> know how could I solve the issue :S
>
> Thanks!
>
> Pablo
>
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