50% efficiency even before MLM matching

Asked by Hardik Routray on 2019-09-30

Dear Madgraph authors,

I am trying to generate g g > h j process in Madgraph and decay it to mu+ mu- after giving h a lifetime in Pythia and then shower it in Pythia. I notice that when even before jet matching, 50% of the events are not reconstructed. After jet matching it reduces to around half of the remaining which is expected. Whereas if I generate g g > h > mu+ mu- in Pythia and shower there itself, the reconstruction efficiency is ~75 %, 25 % are lost due to detector and trigger limitations. I am trying to understand what's going on.

The reason I can't use Pythia for the entire process is probably due to inbulit calculations in Pythia it doesn't give the assigned mass to h when i give a lifetime to h.

I can provide the scripts if needed.

Thanks,
Hardik

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Last query:
2019-09-30
Last reply:
2019-10-01

Hi,

If you want to compare the reconstruction efficiency you should test on the same process. For the rest I can not comment

Cheers

Olivier

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Sent: Monday, September 30, 2019 7:47:22 PM
To: Olivier Mattelaer <email address hidden>
Subject: [Question #684503]: 50% efficiency even before MLM matching

New question #684503 on MadGraph5_aMC@NLO:
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Dear Madgraph authors,

I am trying to generate g g > h j process in Madgraph and decay it to mu+ mu- after giving h a lifetime in Pythia and then shower it in Pythia. I notice that when even before jet matching, 50% of the events are not reconstructed. After jet matching it reduces to around half of the remaining which is expected. Whereas if I generate g g > h > mu+ mu- in Pythia and shower there itself, the reconstruction efficiency is ~75 %, 25 % are lost due to detector and trigger limitations. I am trying to understand what's going on.

The reason I can't use Pythia for the entire process is probably due to inbulit calculations in Pythia it doesn't give the assigned mass to h when i give a lifetime to h.

I can provide the scripts if needed.

Thanks,
Hardik

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