merging

Hi Goutam,

> events.lhe.gz

This is an output before pythia.

> tag_1_pythia_events.hep.gz

This is the official output from pythia. This is the best file to use.

> tag_1_pythia_events.lhe.gz, tag_1_pythia_lhe_events.root

Those are pythia file after a very basic detector reconstruction step (mainly some jet algorithm —cone algorithm—)
we use those output in order to produce the plots and check the sanity of the shower.
Those output should never be use for detector simulation. And if you use this file, you should know that nobody use cone algorithm anymore.

> One question regarding pythia: does pythia decay z bosons automatically in MadGraph

yes

> and if so, whether MDCY(23,1)=0 can stop this decay.

If this is a valid pythia command then in principle yes but please test and check.

Cheers,

Olivier

On Sep 4, 2014, at 7:03 PM, Goutam Das <email address hidden> wrote:

> New question #254075 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/254075
>
> Dear MadGraph Team,
> I have a few questions regarding merging. I am trying to merge p p > z z events with p p > z z j. So my commands are:
> generate p p > z z @0
> add process p p > z z j @1
> output ZZ_MERGING
>
> Then launch with pythia=ON. With modified run_card.dat and pythia_card.dat ckkw=1, Pythia pTE ktscheme, xqcut=Qcut=50 GeV, showerkt=T.
> I am not doing any detector studies so not using Delphes or pgs.
> After Pythia run there are so many files coming in the Event/run_** directory. Which file is best for study? Do tag_1_pythia_events.hep.gz, tag_1_pythia_events.lhe.gz, tag_1_pythia_lhe_events.root contain same information?
> What about the events.lhe.gz file?
> One question regarding pythia: does pythia decay z bosons automatically in MadGraph and if so, whether MDCY(23,1)=0 can stop this decay.
>
> Regards,
> Goutam
>
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