Comparison: old and new tracking

comparison of old and tracking algorithm using urqmd (mainly hadrons) and pluto simulations.

new tracking: version 2
old tracking: version 1

Efficiency

red: new tracking, 2
black: old tracking,1

effi= no of hmdchitsim tracks/mdcgeant
with and without chi2cut

  • efficiency URQMD - old and new tracking algorithm:
    efficiency URQMD - old and new tracking algorithm

  • efficiency PLUTO: old and new tracking algorithm:
    efficiency PLUTO: old and new tracking algorithm

Comment

The effiency for the pluto simulations is low for the inner mdcs. The efficiency will improve if one uses only tracks, which were measured/reconstructed in all detectors.
Further in the inner mdc one has more close pairs from conversion - here the reconstruction is worse. Due to the magentic field it, there are less conversion pairs in the outer chambers (->efficiency higher).

x,y, xdir and ydir Resolution as well as vertex reconstruction

2. comparison of x, y, phi, theta, vertex

xdiff= MdcGeantx-HMdcHitsim.fdata.x
ydiff analog
phi and theta:
Float_t
phihit=TMath::RadToDeg()*atan2(ydir[sector][module],xdir[sector][module]);
Float_t
thetahit=TMath::RadToDeg()*atan2(sqrt(xdir[sector][module]*xdir[sector][module]+ydir[sector][module]*ydir[sector][
module]),zdir[sector][module]);
phidiff=geantphi-phihit
thetadiff analog

vertex:
vertexfromhit=pEventHead->getVertexZ();
vertexz=vertex from geant
vertexdiff=vertexfromhit-vertexz

the pictures:
1st row: new tracking
2nd row: old tracking
3rd row: new tracking-oldtracking

from left to right: xdiff, ydiff, phidiff, thetadiff, vertexdiff
all graphs normalized to 1

  • comparison URQMD:
    comparison URQMD

  • comparison PLUTO:
    comparison PLUTO

Comment

the two tracking algorithms do not give large differences.


-- YvonnePachmayer - 29 Oct 2005
Topic attachments
I Attachment Action Size Date Who CommentSorted ascending
comppluto.gifgif comppluto.gif manage 43.2 K 29 Oct 2005 - 16:07 YvonnePachmayer comparison PLUTO
compurqmd.gifgif compurqmd.gif manage 56.8 K 29 Oct 2005 - 16:07 YvonnePachmayer comparison URQMD
comparisoneffipluto.gifgif comparisoneffipluto.gif manage 18.2 K 29 Oct 2005 - 16:03 YvonnePachmayer efficiency PLUTO: old and new tracking algorithm
comparisoneffiurqmd.gifgif comparisoneffiurqmd.gif manage 18.1 K 29 Oct 2005 - 16:02 YvonnePachmayer efficiency URQMD - old and new tracking algorithm
Topic revision: r2 - 05 Nov 2005, YvonnePachmayer
 
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