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Mass calculation from vector<PndEmcDigi*> in EMC [message #8592] Tue, 19 May 2009 13:51 Go to previous message
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *
Dear all,

I have a question about Mass function in PndEmcCluster using the list of PndEmcDigi.
In this Function, a list of digitization in ONE cluster is called, and all stored digi iterate to build a momentum.
If I correctly understand now, a cluster has few digitization according certain space points, where is only covered region in one cluster. I cannot clearly understand why two or even more digitizations are needed to calculate momentum, how do they involve in one cluster?
Could you explain about that? I just want to know the functionality of this digi list.

Thank you for your help in advance
Donghee Kang.


Double_t PndEmcCluster::Mass() const
00216 {
00217 Double_t mass;
00218 TVector3 clusterMomentum(0,0,0);
00219 vector<PndEmcDigi*>::const_iterator digi_iter;
00220 TVector3 digiDirection;
00221 Double_t digiEnergy;
00222 for (digi_iter=fDigiList.begin();digi_iter!=fDigiList.end();++digi_iter)
00223 {
00224 digiDirection=(*digi_iter)->where().Unit();
00225 digiEnergy=(*digi_iter)->GetEnergy();
00226 clusterMomentum=clusterMomentum+digiDirection*digiEnergy;
00227 }
00229 Double_t clEnergy=energy();
00231 mass=sqrt(clEnergy*clEnergy-clusterMomentum.Mag2());
00233 return mass;
00234 }

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