MadAnalysis by fixing Number of Events

Asked by satendra kumar on 2017-08-12

Dear All,

Can we fix number of events in MA5 rather than fixing Luminosity?

Thanks

Question information

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Status:
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For:
MadAnalysis 5 Edit question
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Last query:
2017-08-16
Last reply:
2017-08-31
Benjamin Fuks (fuks) said : #1

Dear Satendra Kumar,

In short: no. But fixing the luminosity (or the cross section) does the same job, doesn't it?

Regards,

Benjamin

> On 12 Aug 2017, at 12:53 , satendra kumar <email address hidden> wrote:
>
> New question #655824 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/655824
>
> Dear All,
>
>
> Can we fix number of events in MA5 rather than fixing Luminosity?
>
> Thanks
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Dear Benjamin,

Extremely sorry for late response. Yes, It works good. But suppose we want
to fix the Number of Events (without caring the luminosity). Thereafter we
want to see how many events will be left after imposing the various cuts.

If we follow the current MA5 strategy, for example If we have the total
cross section (1.5 fb) for the process, and for its Background the total
cross section (7000 fb). Then, at the fix luminosity, say 10 fb^-1, we will
have 150 events as Signal, and 70,000 events as Background.

We can see for the signal we have very low statistics. In this situation,
we have to generate more and more number of events.

On other hand, if we generate 100,000 events, for both the Signal and
Background. Then keep fix the number of events rather than Luminosity. Even
after applying cuts, we will have sufficient number of events. That is what
I was doing by using older MadAnalysis manually (editing the
plot_events.f).

Thanks,
SK

On Mon, Aug 14, 2017 at 2:39 AM, Benjamin Fuks <
<email address hidden>> wrote:

> Your question #655824 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/655824
>
> Status: Open => Answered
>
> Benjamin Fuks proposed the following answer:
> Dear Satendra Kumar,
>
> In short: no. But fixing the luminosity (or the cross section) does the
> same job, doesn't it?
>
> Regards,
>
> Benjamin
>
>
> > On 12 Aug 2017, at 12:53 , satendra kumar <question655824@answers.
> launchpad.net> wrote:
> >
> > New question #655824 on MadAnalysis 5:
> > https://answers.launchpad.net/madanalysis5/+question/655824
> >
> > Dear All,
> >
> >
> > Can we fix number of events in MA5 rather than fixing Luminosity?
> >
> > Thanks
> >
> > --
> > 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/655824/
> +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/655824
>
> You received this question notification because you asked the question.
>

Benjamin Fuks (fuks) said : #3

Hi Satendra,

There are tewo way out:
 - You can overwrite the cross section to any value you want both for the signal and the background
 - You can ask MA5 to normalize the figures to 1 for each sample.
This should work with respect to what you want to do.

Cheers,

Benjamin

> On 16 Aug 2017, at 08:49 , satendra kumar <email address hidden> wrote:
>
> Question #655824 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/655824
>
> Status: Answered => Open
>
> satendra kumar is still having a problem:
> Dear Benjamin,
>
> Extremely sorry for late response. Yes, It works good. But suppose we want
> to fix the Number of Events (without caring the luminosity). Thereafter we
> want to see how many events will be left after imposing the various cuts.
>
> If we follow the current MA5 strategy, for example If we have the total
> cross section (1.5 fb) for the process, and for its Background the total
> cross section (7000 fb). Then, at the fix luminosity, say 10 fb^-1, we will
> have 150 events as Signal, and 70,000 events as Background.
>
> We can see for the signal we have very low statistics. In this situation,
> we have to generate more and more number of events.
>
> On other hand, if we generate 100,000 events, for both the Signal and
> Background. Then keep fix the number of events rather than Luminosity. Even
> after applying cuts, we will have sufficient number of events. That is what
> I was doing by using older MadAnalysis manually (editing the
> plot_events.f).
>
> Thanks,
> SK
>
> On Mon, Aug 14, 2017 at 2:39 AM, Benjamin Fuks <
> <email address hidden>> wrote:
>
>> Your question #655824 on MadAnalysis 5 changed:
>> https://answers.launchpad.net/madanalysis5/+question/655824
>>
>> Status: Open => Answered
>>
>> Benjamin Fuks proposed the following answer:
>> Dear Satendra Kumar,
>>
>> In short: no. But fixing the luminosity (or the cross section) does the
>> same job, doesn't it?
>>
>> Regards,
>>
>> Benjamin
>>
>>
>>> On 12 Aug 2017, at 12:53 , satendra kumar <question655824@answers.
>> launchpad.net> wrote:
>>>
>>> New question #655824 on MadAnalysis 5:
>>> https://answers.launchpad.net/madanalysis5/+question/655824
>>>
>>> Dear All,
>>>
>>>
>>> Can we fix number of events in MA5 rather than fixing Luminosity?
>>>
>>> Thanks
>>>
>>> --
>>> 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/655824/
>> +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/655824
>>
>> You received this question notification because you asked the question.
>>
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Thanks a lot.

On Wed, Aug 16, 2017 at 12:49 PM, Benjamin Fuks <
<email address hidden>> wrote:

> Your question #655824 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/655824
>
> Status: Open => Answered
>
> Benjamin Fuks proposed the following answer:
> Hi Satendra,
>
> There are tewo way out:
> - You can overwrite the cross section to any value you want both for the
> signal and the background
> - You can ask MA5 to normalize the figures to 1 for each sample.
> This should work with respect to what you want to do.
>
> Cheers,
>
> Benjamin
>
> > On 16 Aug 2017, at 08:49 , satendra kumar <question655824@answers.
> launchpad.net> wrote:
> >
> > Question #655824 on MadAnalysis 5 changed:
> > https://answers.launchpad.net/madanalysis5/+question/655824
> >
> > Status: Answered => Open
> >
> > satendra kumar is still having a problem:
> > Dear Benjamin,
> >
> > Extremely sorry for late response. Yes, It works good. But suppose we
> want
> > to fix the Number of Events (without caring the luminosity). Thereafter
> we
> > want to see how many events will be left after imposing the various cuts.
> >
> > If we follow the current MA5 strategy, for example If we have the total
> > cross section (1.5 fb) for the process, and for its Background the total
> > cross section (7000 fb). Then, at the fix luminosity, say 10 fb^-1, we
> will
> > have 150 events as Signal, and 70,000 events as Background.
> >
> > We can see for the signal we have very low statistics. In this situation,
> > we have to generate more and more number of events.
> >
> > On other hand, if we generate 100,000 events, for both the Signal and
> > Background. Then keep fix the number of events rather than Luminosity.
> Even
> > after applying cuts, we will have sufficient number of events. That is
> what
> > I was doing by using older MadAnalysis manually (editing the
> > plot_events.f).
> >
> > Thanks,
> > SK
> >
> > On Mon, Aug 14, 2017 at 2:39 AM, Benjamin Fuks <
> > <email address hidden>> wrote:
> >
> >> Your question #655824 on MadAnalysis 5 changed:
> >> https://answers.launchpad.net/madanalysis5/+question/655824
> >>
> >> Status: Open => Answered
> >>
> >> Benjamin Fuks proposed the following answer:
> >> Dear Satendra Kumar,
> >>
> >> In short: no. But fixing the luminosity (or the cross section) does the
> >> same job, doesn't it?
> >>
> >> Regards,
> >>
> >> Benjamin
> >>
> >>
> >>> On 12 Aug 2017, at 12:53 , satendra kumar <question655824@answers.
> >> launchpad.net> wrote:
> >>>
> >>> New question #655824 on MadAnalysis 5:
> >>> https://answers.launchpad.net/madanalysis5/+question/655824
> >>>
> >>> Dear All,
> >>>
> >>>
> >>> Can we fix number of events in MA5 rather than fixing Luminosity?
> >>>
> >>> Thanks
> >>>
> >>> --
> >>> 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/655824/
> >> +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/655824
> >>
> >> You received this question notification because you asked the question.
> >>
> >
> > --
> > 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/655824/
> +confirm?answer_id=2
>
> 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/655824
>
> You received this question notification because you asked the question.
>

Launchpad Janitor (janitor) said : #5

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Benjamin Fuks (fuks) said : #6

The question was answered.

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