MadAnalysis 5

Multi-particle event creation

Asked by Ian Fries

Hello. I am trying to study particle decays from 4-top events. My thought was to create what would essentially be a multi-particle composed of jets and leptons, ex.:

define mu = mu+ mu-
define e = e+ e-
define ev1 = j j j j j e mu mu .

I then plotted the scalar sum of transverse momenta of these "particles:"

plot sPT(ev1) <plot parameters>

However, when I did this, the plot didn't really match up to the expected amount of energy for a 4 top decay. Furthermore, no matter how I changed the amount of jets in the "particle," the plot didn't change. I guess my question then is if this would be the correct method to study what I'm looking for with MadAnalysis. Is there a better way to isolate events such as these? And, as an possible extension, could I create something that fits a minimum of these criteria (e.g., an object that accepts all events with a minimum of three jets and three leptons, etc.)? Thanks for the help.

~ Ian

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Benjamin Fuks (fuks) said : 		#1

Hi Ian,

You include all jets and all muons in the events. You may have much more than those arising from the top decay.

Cheers,

Benj

On 22 Jun 2016, at 19:47 , Ian Fries <email address hidden> wrote:

> New question #295576 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/295576
>
> Hello. I am trying to study particle decays from 4-top events. My thought was to create what would essentially be a multi-particle composed of jets and leptons, ex.:
>
> define mu = mu+ mu-
> define e = e+ e-
> define ev1 = j j j j j e mu mu .
>
> I then plotted the scalar sum of transverse momenta of these "particles:"
>
> plot sPT(ev1) <plot parameters>
>
> However, when I did this, the plot didn't really match up to the expected amount of energy for a 4 top decay. Furthermore, no matter how I changed the amount of jets in the "particle," the plot didn't change. I guess my question then is if this would be the correct method to study what I'm looking for with MadAnalysis. Is there a better way to isolate events such as these? And, as an possible extension, could I create something that fits a minimum of these criteria (e.g., an object that accepts all events with a minimum of three jets and three leptons, etc.)? Thanks for the help.
>
> ~ Ian
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
Ian Fries (ianfries) said : 		#2

Okay, thank you.

~ Ian