MadAnalysis 5

multiparticle labels at the reconstructed-level

Asked by vaborla

Hello,

       I am confused about the multiparticle labels at the reconstructed-level. The label j means jets included non-btagging(nb) and btagging (b) ? The label hadronic is the same as label j ? Here label j include particle pdg number 1 2 3 4 5 -1 -2 -3 -4 -5 21 ?
   The label j can be redefined ?
       I have read the manual many times. But I am still confused about them, Can you explain these labels ?

Thanks,
Vaborla

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Benjamin Fuks (fuks) said : 		#1

Dear Vaborla,

By default, there is no such thing as quarks and gluons at the reconstructed level. The label j stands for a jet whose associated PDG code has been defined to be 21. We associated the PDG code 5 to b-jets (the label b) and 1 to non-bjets (the label nb). This is a choice and can be modified through the define and remove commands. You can always access the definition of a label by the command display.

Cheers,

Benjamin

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vaborla (vaborla-tt) said : 		#2

Hi Benjamin,

    As far as I know, there is just jet in lhco events file. We just know that is a jet, but we can not know what pdg this jet includes. The MA5 read the jet from lhco file as what ?

   How does the MA5 associate label j with PDG code ?

  I am still confused about these questions.

Thanks,
Vaborla

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Benjamin Fuks (fuks) said : 		#3

MadAnalysis 5 reads a jet as a jet from a LHCO file. The PDG code stuff is internal. You could use the code to output a LHE file to convince you.

Cheers,

Benjamin

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