0 b-tagged jet in reco mode with delphesMA5

Asked by pattara angkinun on 2019-04-29

Dear MA5 team,

sorry for asking a lot. I would like to study some analysis relying on the multiplicity of b-tagged jet so I started with a simple process, i.e. p p > t t~. Madgraph and pythia8 are used to produce a hepmc file, which I feed to Madanalysis. When the N(b) is plotted using delphes, i.e. set main.fastsim.package = delphes, the distribution looks fine, the peak is at 1 as expected since the b-tagged algorithm is not 100%. However, when I use the delphesMA5 it shows that all event have 0 b-tagged jet, so it looks like some things must be wrong. Do you have any idea what kind of mistake leads to this issue?

P.S. I am using MA5_v1.7

Best regards,
Pattara Angkinun

Question information

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MadAnalysis 5 Edit question
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Last query:
2019-04-29
Last reply:
2019-04-29
Benjamin Fuks (fuks) said : #1

Hi Pattara,

Have you checked the b-tagging properties in the card you have used? If not, please share a small sample (10-20 events) and tell me exactly what you did so that I could try to reproduce it here.

Cheers,

Benjamin

> On 29 Apr 2019, at 14:52 , pattara angkinun <email address hidden> wrote:
>
> New question #680530 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/680530
>
> Dear MA5 team,
>
> sorry for asking a lot. I would like to study some analysis relying on the multiplicity of b-tagged jet so I started with a simple process, i.e. p p > t t~. Madgraph and pythia8 are used to produce a hepmc file, which I feed to Madanalysis. When the N(b) is plotted using delphes, i.e. set main.fastsim.package = delphes, the distribution looks fine, the peak is at 1 as expected since the b-tagged algorithm is not 100%. However, when I use the delphesMA5 it shows that all event have 0 b-tagged jet, so it looks like some things must be wrong. Do you have any idea what kind of mistake leads to this issue?
>
> P.S. I am using MA5_v1.7
>
> Best regards,
> Pattara Angkinun
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Dear Benjamin,

sorry I don't understand what is written in delphesMA5tune_card_CMS.tcl.

I did the following to do the plot:

1. Madgraph + pythia8 for events generatetion, parton showering and hadronization, i.e.

    generate p p > t t~ and shower = Pythia8

2. Madanalysis5

    ./bin/ma5 -R
ma5>set main.fastsim.package = delphesMA5tune
ma5>set main.fastsim.detector = cms
ma5>import toppair.hepmc.gz
ma5>plot N(b)
ma5>submit

Benjamin Fuks (fuks) said : #4

Hi,

It is better to use delphes with the cms-ma5tune card.

Cheers,

Benjamin

> On 29 Apr 2019, at 15:32 , pattara angkinun <email address hidden> wrote:
>
> Question #680530 on MadAnalysis 5 changed:
> https://answers.launchpad.net/madanalysis5/+question/680530
>
> pattara angkinun posted a new comment:
> Dear Benjamin,
>
> sorry I don't understand what is written in delphesMA5tune_card_CMS.tcl.
>
> I did the following to do the plot:
>
> 1. Madgraph + pythia8 for events generatetion, parton showering and hadronization, i.e.
>
> generate p p > t t~ and shower = Pythia8
>
> 2. Madanalysis5
>
> ./bin/ma5 -R
> ma5>set main.fastsim.package = delphesMA5tune
> ma5>set main.fastsim.detector = cms
> ma5>import toppair.hepmc.gz
> ma5>plot N(b)
> ma5>submit
>
> --
> You received this question notification because you are an answer
> contact for MadAnalysis 5.

Dear Benjamin,

thank you for the reply. Sorry for a naive question, where can I find the cms-ma5tune card. Could you please give me the exact name, I don't see it in neither delples/cards nor delplesMA5tune/cards directory. Furthermore, Indeed I want to recast the ​CMS-SUS-13-011 which is contained in PADForMA5tune so how can I use delphes as a detector simulation.

Best regards,
Pattara Angkinun

Benjamin Fuks (fuks) said : #6

Hi,

>
> thank you for the reply. Sorry for a naive question, where can I find
> the cms-ma5tune card. Could you please give me the exact name, I don't
> see it in neither delples/cards nor delplesMA5tune/cards directory.
Please check https://arxiv.org/abs/1808.00480 <https://arxiv.org/abs/1808.00480>. Everything is in there.

> Furthermore, Indeed I want to recast the ​CMS-SUS-13-011 which is
> contained in PADForMA5tune so how can I use delphes as a detector
> simulation.
Then you have no choice to use delphesMA5tune. Could you please try in replacing the standard delphes card by the one of the CMS-SUS-13-011 analysis to see whether the issue remains?

Cheers

Benjamin

Dear Benjamin,

thank you for the answer.

Best regards,
Pattara Angkinun

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