MadAnalysis 5

New heavy stable particle assumed to be hadron and passed to fastjet for clustering

Asked by Rakhi Mahbubani

Dear MA5 team,

In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect. On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container! Is this a bug? I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?

Cheers,

Rakhi

Question information

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MadAnalysis 5 Edit question
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Solved by:
Benjamin Fuks
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Revision history for this message
Best Benjamin Fuks (fuks) said : 		#1

Hi Rakhi,

Well, we had to choose a default behavior. We decided that in the case where a particle would not be tagged as invisible, it will be passed to fastjet. That's it :) Nothing more nothing less.

Cheers,

Benj

On 27 Jan 2016, at 23:07 , Rakhi Mahbubani <email address hidden> wrote:

> New question #283811 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Dear MA5 team,
>
> In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect. On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container! Is this a bug? I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?
>
> Cheers,
>
> Rakhi
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
Rakhi Mahbubani (r-mahbubani) said : 		#2

Dear Benjamin,
thanks for the prompt response!  Is this behaviour documented anywhere?
Cheers,
Rakhi

      From: Benjamin Fuks <email address hidden>
 To: <email address hidden>
 Sent: Thursday, January 28, 2016 12:02 AM
 Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering

Your question #283811 on MadAnalysis 5 changed:
https://answers.launchpad.net/madanalysis5/+question/283811

    Status: Open => Answered

Benjamin Fuks proposed the following answer:
Hi Rakhi,

Well, we had to choose a default behavior. We decided that in the case
where a particle would not be tagged as invisible, it will be passed to
fastjet. That's it :) Nothing more nothing less.

Cheers,

Benj

On 27 Jan 2016, at 23:07 , Rakhi Mahbubani <email address hidden> wrote:

> New question #283811 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Dear MA5 team,
>
> In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect.  On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container!  Is this a bug?  I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?
>
> Cheers,
>
> Rakhi
>
> --
> 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/283811/+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/283811

You received this question notification because you asked the question.

Revision history for this message
Rakhi Mahbubani (r-mahbubani) said : 		#3

Thanks Benjamin Fuks, that solved my question.

Revision history for this message
Benjamin Fuks (fuks) said : 		#4

Hi Rakhi,

I do not think so… sorry about that.

Cheers,

Benjamin

On 28 Jan 2016, at 10:02 , Rakhi Mahbubani <email address hidden> wrote:

> Question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Status: Answered => Open
>
> Rakhi Mahbubani is still having a problem:
> Dear Benjamin,
> thanks for the prompt response! Is this behaviour documented anywhere?
> Cheers,
> Rakhi
>
>
>
> From: Benjamin Fuks <email address hidden>
> To: <email address hidden>
> Sent: Thursday, January 28, 2016 12:02 AM
> Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering
>
> Your question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Status: Open => Answered
>
> Benjamin Fuks proposed the following answer:
> Hi Rakhi,
>
> Well, we had to choose a default behavior. We decided that in the case
> where a particle would not be tagged as invisible, it will be passed to
> fastjet. That's it :) Nothing more nothing less.
>
> Cheers,
>
> Benj
>
>
> On 27 Jan 2016, at 23:07 , Rakhi Mahbubani <email address hidden> wrote:
>
>> New question #283811 on MadAnalysis 5:
>> https://answers.launchpad.net/madanalysis5/+question/283811
>>
>> Dear MA5 team,
>>
>> In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect. On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container! Is this a bug? I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?
>>
>> Cheers,
>>
>> Rakhi
>>
>> --
>> 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/283811/+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/283811
>
> You received this question notification because you asked the question.
>
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Revision history for this message
Rakhi Mahbubani (r-mahbubani) said : 		#5

Hi Benjamin,
in that case can I suggest you make this information available somewhere visible in the future?  I wasted some time on it, and don't want others to do the same :)
Cheers,
Rakhi

      From: Benjamin Fuks <email address hidden>
 To: <email address hidden>
 Sent: Thursday, January 28, 2016 11:22 PM
 Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering

Your question #283811 on MadAnalysis 5 changed:
https://answers.launchpad.net/madanalysis5/+question/283811

Benjamin Fuks posted a new comment:
Hi Rakhi,

I do not think so… sorry about that.

Cheers,

Benjamin

On 28 Jan 2016, at 10:02 , Rakhi Mahbubani <email address hidden> wrote:

> Question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
>    Status: Answered => Open
>
> Rakhi Mahbubani is still having a problem:
> Dear Benjamin,
> thanks for the prompt response!  Is this behaviour documented anywhere?
> Cheers,
> Rakhi
>
>
>
>      From: Benjamin Fuks <email address hidden>
> To: <email address hidden>
> Sent: Thursday, January 28, 2016 12:02 AM
> Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering
>
> Your question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
>    Status: Open => Answered
>
> Benjamin Fuks proposed the following answer:
> Hi Rakhi,
>
> Well, we had to choose a default behavior. We decided that in the case
> where a particle would not be tagged as invisible, it will be passed to
> fastjet. That's it :) Nothing more nothing less.
>
> Cheers,
>
> Benj
>
>
> On 27 Jan 2016, at 23:07 , Rakhi Mahbubani <email address hidden> wrote:
>
>> New question #283811 on MadAnalysis 5:
>> https://answers.launchpad.net/madanalysis5/+question/283811
>>
>> Dear MA5 team,
>>
>> In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect.  On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container!  Is this a bug?  I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?
>>
>> Cheers,
>>
>> Rakhi
>>
>> --
>> 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/283811/+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/283811
>
> You received this question notification because you asked the question.
>
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

--
You received this question notification because you asked the question.

Revision history for this message
Benjamin Fuks (fuks) said : 		#6

Hi Rakhi,

I agree 100% with you. The manual is a bit outdated and many new functionalities has been added in the meantime. We are currently preparing a major upgrade of the code for 2016 and we will update the manual at that time.

Regards,

Benj

On 29 Jan 2016, at 09:27 , Rakhi Mahbubani <email address hidden> wrote:

> Question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Rakhi Mahbubani posted a new comment:
> Hi Benjamin,
> in that case can I suggest you make this information available somewhere visible in the future? I wasted some time on it, and don't want others to do the same :)
> Cheers,
> Rakhi
>
>
> From: Benjamin Fuks <email address hidden>
> To: <email address hidden>
> Sent: Thursday, January 28, 2016 11:22 PM
> Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering
>
> Your question #283811 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/283811
>
> Benjamin Fuks posted a new comment:
> Hi Rakhi,
>
> I do not think so… sorry about that.
>
> Cheers,
>
> Benjamin
>
>
> On 28 Jan 2016, at 10:02 , Rakhi Mahbubani <email address hidden> wrote:
>
>> Question #283811 on MadAnalysis 5 changed:
>> https://answers.launchpad.net/madanalysis5/+question/283811
>>
>> Status: Answered => Open
>>
>> Rakhi Mahbubani is still having a problem:
>> Dear Benjamin,
>> thanks for the prompt response! Is this behaviour documented anywhere?
>> Cheers,
>> Rakhi
>>
>>
>>
>> From: Benjamin Fuks <email address hidden>
>> To: <email address hidden>
>> Sent: Thursday, January 28, 2016 12:02 AM
>> Subject: Re: [Question #283811]: New heavy stable particle assumed to be hadron and passed to fastjet for clustering
>>
>> Your question #283811 on MadAnalysis 5 changed:
>> https://answers.launchpad.net/madanalysis5/+question/283811
>>
>> Status: Open => Answered
>>
>> Benjamin Fuks proposed the following answer:
>> Hi Rakhi,
>>
>> Well, we had to choose a default behavior. We decided that in the case
>> where a particle would not be tagged as invisible, it will be passed to
>> fastjet. That's it :) Nothing more nothing less.
>>
>> Cheers,
>>
>> Benj
>>
>>
>> On 27 Jan 2016, at 23:07 , Rakhi Mahbubani <email address hidden> wrote:
>>
>>> New question #283811 on MadAnalysis 5:
>>> https://answers.launchpad.net/madanalysis5/+question/283811
>>>
>>> Dear MA5 team,
>>>
>>> In analysing events with pair-production of a new heavy colour-neutral stable particle (in association with a leptonic Z), I was finding significant jet activity, contrary to what you would expect. On further investigation, I found that the stable new particles were being passed to fastjet for clustering, and showing up in the jet container! Is this a bug? I can work around it by redefining the 'invisible' multiparticle to include the new pdg ids, but this shouldn't be the default behaviour, should it?
>>>
>>> Cheers,
>>>
>>> Rakhi
>>>
>>> --
>>> 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/283811/+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/283811
>>
>> You received this question notification because you asked the question.
>>
>> You received this question notification because you are an answer
>> contact for MadAnalysis 5.
>
> --
> You received this question notification because you asked the question.
>
> You received this question notification because you are an answer
> contact for MadAnalysis 5.