MadGraph5_aMC@NLO

ttbar invariant mass cuts not working

Asked by rchan

I am trying to generate p p > t t~ for some model and
due to the large cross section I want to put a generation level cut on its invariant mass to see the high mass tail.

I am using this command in the {6:500} = mxx_min_pdg (I am using v2.9.14).
But in the output it looks like it's not working.

Kindly help.

Thanks,
R

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

If I run the following set of command
generate p p > t t~
output
launch
launch
set mxx_min_pdg {6:500}
launch
set mxx_min_pdg {6:1000}

We got as cross-section:
1) Cross-section : 505.8 +- 0.8033 pb
2) Cross-section : 213.3 +- 0.3364 pb
3) Cross-section : 12.87 +- 0.02133 pb
(and each sample was 10k events)

So it seems working to me.

Cheers,

Olivier

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rchan (rhul7) said : 		#2

Hmm.
This is working. (It wasn't when I was copy-pasted a run_card)

Thanks a lot

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rchan (rhul7) said : 		#3

Oh!
6 should have been in single quotes

{'6':500} = mxx_min_pdg