MadAnalysis 5

Missing Invariant Mass Cut is not working

Asked by shibasipu

Hi Benjamin,
                           I am doing a signal vs. background analysis. I have several backgrounds. Out of them, one background is Z+jets with Z decaying to neutrinos. I want to reject this background. So I have applied the following cut in the normal mode.

reject M(invisible[1] invisible[2]) > 100

But surprisingly, it is not rejecting any events. Am I doing something wrong ?

NOTE : I am analyzing the root files.

Regards,
Shiba

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Benjamin Fuks
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shibasipu (shibasipu) said : 		#1

Hi Benjamin,
                              If I apply the cut i.e. "select M(invisible[1] invisible[2]) > 100" it is rejecting all the signal and background events.
I am not getting what is happening.

Regards,
Shiba

Revision history for this message
Best Benjamin Fuks (fuks) said : 		#2

Hi Shiba,

In a Delphes file, you have only one missing energy object. All invisible particles momenta have been summed and you do not have access to the individual guys. Therefore, your cut is meaningless.

Cheers,

Benjamin

On 17 Mar 2016, at 12:37 , shibasipu <email address hidden> wrote:

> Question #288759 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/288759
>
> shibasipu gave more information on the question:
> Hi Benjamin,
> If I apply the cut i.e. "select M(invisible[1] invisible[2]) > 100" it is rejecting all the signal and background events.
> I am not getting what is happening.
>
>
>
>
> Regards,
> Shiba
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
shibasipu (shibasipu) said : 		#3

Thanks Benjamin Fuks, that solved my question.