Micro-TPC, a Low Mass Vertex Detector for Use in Heavy Ion Collider Experiments

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Micro-TPC, a Low Mass Vertex Detector for Use in
Heavy Ion Collider Experiments
Fabrice RETIERE LBNL December 1997
Selected slides from above, HW March 00
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Comparison of the SVT and the micro TPC method
SVT Fit a straight using
the 2 first points
Micro TPC Fit a straight line
using the 4 points
Beam pipe
Impact parameter
Impact parameter
2nd layer
1st layer
1st circle
Using the estimated values of multiple scattering
and position resolution, we have calculated the
average impact parameter obtained by fitting the
track by a straight line.
2nd circle
3rd circle
4th circle
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Comparison of the SVT and the micro TPC results
insert scattering.jpg