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VertexFinder [message #5398]

Wed, 14 November 2007 17:29

Anonymous Poster

From: *ikp.kfa-juelich.de

Hello!

There were several classes in old Ralph's code (stt2) to look for the secondary decay vertices and fit them (CbmSttVertexFinder, CbmSttVertexFitter). It's look like that this classes were lost during merging process of the stt1 and stt2 packages. Is there any plans to reimplement them again? Because it's needed for the strange baryon decays studies...

Best regards,

Andrey

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Re: VertexFinder [message #5400 is a reply to message #5398]

Wed, 14 November 2007 18:21

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: *gsi.de

hi Andrei, i was looking inside others packages
also to manage the same point, and i found that
inside of recotask
there is a so called Lambdaselector class created ny Sebastian.it is used to determined the decay vertex of lambda
by using the #include "ExtrapolateToPCA.h"

// find point of closest approach
ExtrapolateToPCA(protontrk,piontrk);

std::cout<<"Vertex at:"<<std::endl;
Int_t size=_vertexArray->GetEntriesFast();
TVector3* v=new((*_vertexArray)[size]) TVector3(0.5*(protontrk->getPos()+piontrk->getPos()));
v->Print();

so i don't know .
I have not yet tried.Let me know if it works well.

cheers ALicia.

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Re: VertexFinder [message #5402 is a reply to message #5398]

Wed, 14 November 2007 18:58

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: *gsi.de

hi again,
if you have access to
/d/panda02/ in gsi
in my account (asanchez)you will find the stt2 directory with the old code.

cheers ALicia.

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Re: VertexFinder [message #5436 is a reply to message #5398]

Fri, 16 November 2007 15:35

Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino

first-grade participant

From: *pv.infn.it

Hi Andrei,
we know there are several classes above all concerning the vertexes which have not been yet implemented in the merged stt code. We did not import the stt2 vertex classes previously, because we were more focussed on the momentum resolution, geane stuff and so on, but we kept in mind the existence of such classes. Up to now we have not thought so much about the vertexing, but we are open also to the option of reusing Ralph' s classes, which, moreover, fit in the existing stt structure (with some changes, for example they should also be translated into PndStt instead of CbmStt (see new stt repository) according to the conventions).
If you want to try to adapt the old Ralph' s vertex code to the stt you' re welcome! Smile

If you need the old code I think you can find it also in
https://subversion.gsi.de/fairroot/release/pandaroot/1_0_0/stt2/

Best regards,
Lia and Pablo.

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