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


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


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:
thetadiff analog

vertexz=vertex from geant

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


the two tracking algorithms do not give large differences.

-- YvonnePachmayer - 29 Oct 2005
Topic attachments
I Attachment Action Size Date Who Comment
comparisoneffipluto.gifgif comparisoneffipluto.gif manage 18 K 2005-10-29 - 18:03 YvonnePachmayer efficiency PLUTO: old and new tracking algorithm
comparisoneffiurqmd.gifgif comparisoneffiurqmd.gif manage 18 K 2005-10-29 - 18:02 YvonnePachmayer efficiency URQMD - old and new tracking algorithm
comppluto.gifgif comppluto.gif manage 43 K 2005-10-29 - 18:07 YvonnePachmayer comparison PLUTO
compurqmd.gifgif compurqmd.gif manage 56 K 2005-10-29 - 18:07 YvonnePachmayer comparison URQMD
Topic revision: r2 - 2005-11-05, YvonnePachmayer
Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki Send feedback | Imprint | Privacy Policy (in German)