Events less than One

Asked by Najimuddin Khan on 2017-05-05

Hi,
I am using default Madanalysis in Madgraph. I am plotting Events vs invariant mass and getting events less than One. I think it is normalisation effect.
Could you please suggest me where I should change this effect?
N Khan

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2017-05-05
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2017-05-05
Benjamin Fuks (fuks) said : #1

Dear Najimuddin,

I am afraid I don't understand what you want to do. You can modify the cross section by hand via the xseciton attribute of the dataset class. But the cross section returned by madgraph is the LO cross section related to your process, and it is what it is: if it is small, well it is small.

Cheers,

Benjamin

> On 5 May 2017, at 10:14 , Najimuddin Khan <email address hidden> wrote:
>
> New question #631223 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/631223
>
> Hi,
> I am using default Madanalysis in Madgraph. I am plotting Events vs invariant mass and getting events less than One. I think it is normalisation effect.
> Could you please suggest me where I should change this effect?
> N Khan
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

My cross section is ~10^-9 pb for some model. Please find the attached
file. I didn't understand what is the meaning of this plot.
Please help me to understand why events less than One. It should be zero or
greater than One. Is it normalise?

Sincerely yours,
Najimuddin Khan,
Postdoctoral Fellow,
Physical Research Laboratory <https://www.prl.res.in/>,
Navrangpura, Ahmedabad, Gujarat,
India-380009

On Fri, May 5, 2017 at 1:58 PM, Benjamin Fuks <
<email address hidden>> wrote:

> Your question #631223 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/631223
>
> Status: Open => Answered
>
> Benjamin Fuks proposed the following answer:
> Dear Najimuddin,
>
> I am afraid I don't understand what you want to do. You can modify the
> cross section by hand via the xseciton attribute of the dataset class.
> But the cross section returned by madgraph is the LO cross section
> related to your process, and it is what it is: if it is small, well it
> is small.
>
> Cheers,
>
> Benjamin
>
>
> > On 5 May 2017, at 10:14 , Najimuddin Khan <question631223@answers.
> launchpad.net> wrote:
> >
> > New question #631223 on MadAnalysis 5:
> > https://answers.launchpad.net/madanalysis5/+question/631223
> >
> > Hi,
> > I am using default Madanalysis in Madgraph. I am plotting Events vs
> invariant mass and getting events less than One. I think it is
> normalisation effect.
> > Could you please suggest me where I should change this effect?
> > N Khan
> >
> > --
> > You received this question notification because you are an answer
> > contact for MadAnalysis 5.
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/madanalysis5/+question/631223/
> +confirm?answer_id=0
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/madanalysis5/+question/631223
>
> You received this question notification because you asked the question.
>

Benjamin Fuks (fuks) said : #3

I cannot see the plot, but that just mean that for the considered luminosity, you have almost zero event.

Regards,

Benjamin

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