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Question about the EvtSpinDensity [message #16008]

Wed, 19 March 2014 07:35

gopchang22
Messages: 2
Registered: March 2014
Location: Korea

occasional visitor

From: *snu.ac.kr

Dear everyone.

I'm studying the decay of Lambda_c+(2765) to Sigma_c Pi to find out the spin of Lambda_c(2765)+.
And I'd like to generate the MC of this decay with each Lambda_c(2765) spin hypothesis.
The configuration of spin is easy, but I'd like to change the spin density of Lambda_c(2765).
I guess EvtSpinDensity is the one I'm looking for,
but I have no idea how to use it.

Is there any simple example or manual about this?
Any advice or comment would be appreciated.

Changwoo Joo

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Re: Question about the EvtSpinDensity [message #16017 is a reply to message #16008]

Fri, 21 March 2014 09:52

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: 93.48.224*

Did you check the EvtGen documentation file in the repository?

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Re: Question about the EvtSpinDensity [message #16083 is a reply to message #16017]

Fri, 28 March 2014 07:41

gopchang22
Messages: 2
Registered: March 2014
Location: Korea

occasional visitor

From: *snu.ac.kr

Dear Stefano Spataro.

Thank you very much for your attention.
Actually I don't belong to PANDA, I belong to BELLE experiment in Japan.
So I can't access documentation except on web.
Now I'm reading "EvtGen A Monte Carlo Generator for B-Physics - Cern" (IT's easy to find in google.)
but description is not enough.
Could you send me a document file in repository using e-mail? (gopchang22@gmail.com)
It will be very appreciate.

Changwoo Joo

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Re: Question about the EvtSpinDensity [message #16234 is a reply to message #16083]

Fri, 04 April 2014 15:12

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Inside the evtgen installation there is a doc folder, which has the latex source of the documentation, you need only to compile it. But I believe it is the same of the document you already have.

The evtgen models change the spin density of the outgoing particles, not of the "primaries". In this sense, once you let the Lambda_c(2765) decay you cannot change the properties.Now the question is: which channel produces your lambda_c? Once you define your channel, there you need to use the appropriate model. Maybe PARTWAVE could help in this case.
Maybe I have confused you more, did you ask directly to the evtgen people?

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