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Pb Glass Shower Shape (Geant4)

Updated on Sat, 2010-09-11 23:35. Originally created by heppel on 2010-08-22 14:47.

Sept 13  Photon-Pi0 separation from Run 9 Data

Conclusion: Observing roughly similar numbers of pi0 and isolated single gamma clusters at ~80 GeV in the South FMS small cells, we can select events (a selection fraction of about 2/3) for which the separation between pi0 and single photon is very clear.

For these events spin asymmetries should be measurable without bias from selection.

For the remaining 1/3 of the events, some separation is possible with mixing that should be constrained by the 2/3 of data that is clearly separated.


The detail in the ppt or pdf files below discuss:

  • Study of Run 9 Single Photon Shower Shape with photons from Eta decays

  • Single cluster Pi0’s are identified in energy range 50-60 GeV

  • Study more general single cluster events in energy range (50-60) GeV

  • Study  single cluster events in energy range (70-80) GeV

  • There is no reason to doubt that these methods can be extended to above 100 GeV with modest degradation in separation.

 

STAR/files/userfiles/1651/file/PbGlassShape/HighEnergy_Pi0_Gamma_Run9.ppt

STAR/files/userfiles/1651/file/PbGlassShape/HighEnergy_Pi0_Gamma_Run9.pdf

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Aug 30

100 GeV photon pion separation in Geant4

STAR/files/userfiles/1651/file/PbGlassShape/GeantSim100.ppt

STAR/files/userfiles/1651/file/PbGlassShape/GeantSim100.pdf

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Aug 23

Some work on Pb Glass Shower Shapes:

STAR/files/userfiles/1651/file/PbGlassShape/GeantSim%204%20(1).pdf

 STAR/files/userfiles/1651/file/PbGlassShape/GeantSim%204.ppt

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