MadAnalysis 5

plotting differential cross section

Asked by Antony Martini

Dear MadAnalysis team,

I need to plot a missing transverse energy distribution. To do this, I would like to have a differential cross section \frac{d\sigma}{d E_T^{miss}} on the y-axis (and MET on the x-axis of course). My problem is that MadAnalysis only produces a number of events on the y-axis and so I would like to know which commands I have to enter in order to get my y-axis?

Thanks a lot,

Antony M.

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Benjamin Fuks (fuks) said : 		#1

Dear Antony,

In the case you want a differential cross section instead of a number of events, it is enough to pick up the right luminosity and bin size.

Cheers,

Benjamin

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Antony Martini (a-martini03) said : 		#2

Thansk for the answer. I have already use

set main.lumi = 19.5 // I've put a number randomly to test

and I don't have the feeling to get what I want...

Maybe it was not your point?

Antony

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Benjamin Fuks (fuks) said : 		#3

Hi Antony,

I was simply suggesting to tune the bin size and the luminosity so that the number of events equals the cross section.

Cheers,

Benjamin

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bj1986 (bjain) said : 		#4

Hello Benjamin,

Can you please give me more details on how to change the luminosity and bin size?
I have imported the LHE file. I can change the luminosity using set main.lumi = <value>
What is the next step to make sure y- axis of a plot is not number of events but the differential cross section ?

Bithika

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Benjamin Fuks (fuks) said : 		#5

Dear Bithika,

There is no unique answer to this question. The luminosity is set in fb^{-1}, while the bin size depends on the required setup for your plot (min, max and number of bin). Note that the cross section is given in pb. The rest is a matter of multiplying things together.

Cheers,

Benjamin

> On 23 Jun 2017, at 09:08 , bj1986 <email address hidden> wrote:
>
> Question #244358 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/244358
>
> bj1986 requested more information:
> Hello Benjamin,
>
> Can you please give me more details on how to change the luminosity and bin size?
> I have imported the LHE file. I can change the luminosity using set main.lumi = <value>
> What is the next step to make sure y- axis of a plot is not number of events but the differential cross section ?
>
> Bithika
>
> --
> You received this question notification because you are subscribed to
> the question.

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