ttbar generation

Asked by Sebastian Urrutia-Quiroga on 2019-09-22

Hi all,

I'm generating the SM background for a process of my interest, specifically the t tbar production with semileptonic decay for one top considering only electrons,

generate p p > t t~, (t > w+ b, w+ > j j), (t~ > w- b~, w- > e- ve~)
add process p p > t t~ j, (t > w+ b, w+ > j j), (t~ > w- b~, w- > e- ve~)

using Pythia8 for showering and Delphes for collider simulation.

I generated 10k events before matching, and I got ~4k after matching. What really puzzles me is the fact that my final ROOT file has a significant number of 0-electron events, even bigger than the number of 1-electron events.

Is this normal? If not, could you address me about how to solve the issue?

Thank you in advance,
Sebastian

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2019-09-22
Last query:
2019-09-22
Last reply:
2019-09-22

I guess this is not a question for us (after mg5amc You have 100% one electron event). I would believe that this is a reconstruction effect. And therefore would suggest to contact Delphes author

Cheers

Olivier

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________________________________
From: <email address hidden> <email address hidden> on behalf of Sebastian Urrutia-Quiroga <email address hidden>
Sent: Sunday, September 22, 2019 3:43:52 PM
To: Olivier Mattelaer <email address hidden>
Subject: [Question #684114]: ttbar generation

New question #684114 on MadGraph5_aMC@NLO:
https://answers.launchpad.net/mg5amcnlo/+question/684114

Hi all,

I'm generating the SM background for a process of my interest, specifically the t tbar production with semileptonic decay for one top considering only electrons,

generate p p > t t~, (t > w+ b, w+ > j j), (t~ > w- b~, w- > e- ve~)
add process p p > t t~ j, (t > w+ b, w+ > j j), (t~ > w- b~, w- > e- ve~)

using Pythia8 for showering and Delphes for collider simulation.

I generated 10k events before matching, and I got ~4k after matching. What really puzzles me is the fact that my final ROOT file has a significant number of 0-electron events, even bigger than the number of 1-electron events.

Is this normal? If not, could you address me about how to solve the issue?

Thank you in advance,
Sebastian

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contact for MadGraph5_aMC@NLO.

I see, thank you so much!

Thanks Olivier Mattelaer, that solved my question.