dEdx for tracks in the tpcs

From: Claus O. E. Jorgensen (ekman@nbi.dk)
Date: Mon Nov 13 2000 - 09:31:33 EST

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    Hello everybody

I would like to start a discussion on how to get
dEdx information for the local tracks. Right now
the only way to do it is to get the BrDetectorHits
and look through all the BrTPCHitClusters to see 
which hit matches which cluster and then get the 
energy from the cluster. As I see it we have 3 
options:

1) Keep it the way it is.

2) Let the BrDetectorHit have an Float_t dEdx 
member and corresponding get and set methods.

3) Let the BrDetectorHit have a void pointer to 
the BrTPCHitCluster (or the BrDCCluster) and 
corresponding get and set methods 
(void* GetMotherCluster() and SetMotherCluster(*void). 

As I see it the latter is the best solution. It
will make it easy to get the energy, and we'll 
avoid having a not-defined dEdx for detector hits in
the DCs (these detectors don't measure the energy,
as far as I'm informed). 

Any comments? 

Claus Jorgensen

Phone  : (+45) 33 32 49 49 
Office : (+45) 35 32 53 05 
E-mail : ekman@nbi.dk

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