MadGraph5_aMC@NLO

Question about the status code of the partons after PS

Asked by Da Liu

Hi,

   I am confused about the status code of the particles, usually we think status = 1 means the final entry, status = 2 means the decayed or fragmented ones. But what happened to the partons emitting another parton? For example, what about a b1->b2 + g, and the b2 parton is hadronized? Then what the status code of b1?

Thanks in advance.

Best wishes,

Da

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Valentin Hirschi
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Da Liu (liuda) said : 		#1

Hi,

Actually, is there a way to extract the information of partons from heavy particles decay (through pythia), but before PS?

Best wishes,
Da

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Best Valentin Hirschi (valentin-hirschi) said : 		#2

Dear Da Liu,

This is more a question relevant for authors of the Parton Shower Monte-Carlos.
You can find a whole list and description of the parton shower status codes in the Pythia8 manual, at

http://home.thep.lu.se/~torbjorn/pythia81html/Welcome.html

and then select 'Event record' on the left side and look for "status code, according to well-defined rules" in the text. Opening the hyperlink on 'rules' will send you to the list of status codes and their descriptions.

As for your second question, I am not sure I understand it correctly, but if you want to trace back the parton-level origin of hadrons in showered events then the answer is, no, there is no easy way of achieving that and you will have to code the relevant analysis code yourself for achieving that. Notice that pythia8.2 has a new function 'HasAncestor()' which might be of help.

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Da Liu (liuda) said : 		#3

Thanks Valentin Hirschi, that solved my question.