MadGraph5_aMC@NLO

Meaning of some variables in histograms

Asked by Ahmed Thabt

I was following the tutorial in https://indico.cern.ch/event/555228/

when I reached slide 68, it was mentioning variables like: pT(t), pT(tt̄), y(t), M(tt̄), Δɸ(tt̄), without defining them.

What is the meaning of each variable of those, and are there any resources explaining them?

thanks in advance

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

Hi,

PT means transverse momentum
y means rapidity
M means invariant mass

when they apply on “t” it means on the top and when they apply on the tt~ system (sum of the 4 momenta of the top and anti-top)

Δɸ means the difference of azimuthal angle between the two particle specified.

> What is the meaning of each variable of those, and are there any resources explaining them?

Any text book (like Peskin) should certainly explain such variable (and explain why we use such variable for LHC and not those that we used at LEP).

Cheers,

Olivier

> On Jan 7, 2017, at 16:09, Ahmed Thabt <email address hidden> wrote:
>
> New question #432647 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/432647
>
> I was following the tutorial in https://indico.cern.ch/event/555228/
>
> when I reached slide 68, it was mentioning variables like: pT(t), pT(tt̄), y(t), M(tt̄), Δɸ(tt̄), without defining them.
>
> What is the meaning of each variable of those, and are there any resources explaining them?
>
> thanks in advance
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Ahmed Thabt (diable.sombre) said : 		#2

Thanks Olivier Mattelaer, that solved my question.