MadGraph5_aMC@NLO

Invariant mass event

Asked by marlon

Good day sir, i already done my simulation in Madgraph and i extracted my Rootfile to further analysis and i notice something, i got a data points in my events vs invariant mass which has events less than 1 , i mean fraction event. I hope you can gimme a good explanation about this. by the way i got a binning of event/0.3TeV.

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

1) What do you plot in the y axis?
Number of events? sum of the weights, average of the weights,....

2) What type of generation are you doing? Do you have source of negative events? (non positive PDF, NLO, non definitive positive matrix-element)

Cheers,

Olivier

> On 23 Dec 2019, at 21:17, marlon <email address hidden> wrote:
>
> New question #687474 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/687474
>
> Good day sir, i already done my simulation in Madgraph and i extracted my Rootfile to further analysis and i notice something, i got a data points in my events vs invariant mass which has events less than 1 , i mean fraction event. I hope you can gimme a good explanation about this. by the way i got a binning of event/0.3TeV.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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marlon (chuchupachula) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

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marlon (chuchupachula) said : 		#3

Okay my bad, actually i found out that the data points accounts for invariant mass with zero events. Sorry for the disturbance sir. I just get confused because when i do log scale the y-axis i notice some error bars from below 1. By the way thank you for the fast response. Cheers.