Home » PANDA » PandaRoot » Analysis » Vertex Fitter in Fast simulation
| Re: Vertex Fitter in Fast simulation [message #16146 is a reply to message #16144] |
Tue, 01 April 2014 11:58   |
donghee
Messages: 385
Registered: January 2009
Location: Germnay
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first-grade participant |
From: *kph.uni-mainz.de
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We have few choice including your suggestion.
1. take a reference track, then get position.
2. Access poca in RhoTupleQA ntuple, which is already stored as "prefix"+pocax(y,z,qa) in your ntuple.
3. Re-do poca by hand as like this where dp[j] is your candidate list.
PndVtxPoca POCAvtx;
TVector3 POCAvertex(0,0,0);
double POCA=-10000;
double POCAdist=-10000;
POCA = POCAvtx.GetPocaVtx(POCAvertex,dp[j]);
double poca_x = POCAvertex. );
double poca_y = POCAvertex.Y();
double poca_z = POCAvertex.Z();
I think that this way one may avoid ambiguity for choice of reference track.
But disadvantage is that POCA approach cannot be used with neutral composite as like pion0 k_s or Lambda0, unfortunately.
Best wished,
Donghee
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