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icon5.gif  Charged Hits in Neutral List [message #17139] Fri, 08 August 2014 13:54 Go to previous message
Lu Cao is currently offline  Lu Cao
Messages: 77
Registered: February 2013
continuous participant
From: *ikp.kfa-juelich.de
Dear PID experts,
I simulated 10 charged kaon in box generator with the momentum (1,4) GeV/c and checked the photon multiplicity in this K+ box like this:
---event loop---
theAnalysis->FillList(neu,"Neutral");
hgeve->Fill(neu.GetLength()); 

index.php?t=getfile&id=8011&private=0
As shown in the attached .png, in the 10 evt K+, we got avg. 5.7 neutrals and 2 of those events got surprising 16 neutrals.

To understand this in a deeper level, Tobias helped to check the EMC cluster in MCTrack:
fMCMatch->CreateArtificialStage("MCTrack");
Int_t nCluster = fClusterArray->GetEntriesFast();
Int_t nTracks = fMCTrackArray->GetEntriesFast();
//loop to test Cluster
	for (Int_t iCluster=0; iCluster<nCluster; iCluster++)
	{
		PndEmcCluster* theCluster = (PndEmcCluster*) fClusterArray->At(iCluster);
		std::vector<Int_t> mcIndexes = theCluster->GetMcList();
		for (Int_t iMcIndex = 0; iMcIndex < mcIndexes.size(); iMcIndex++){
			std::cout << "Tracks in Cluster " << iCluster << " TrackId: " << mcIndexes.at(iMcIndex); // << std::endl;
			PndMCTrack* myTrack = (PndMCTrack*)fMCTrackArray->At(mcIndexes.at(iMcIndex));
			std::cout << " PdgCode: " << myTrack->GetPdgCode() << std::endl;
		}
	}


Then, we got this info:
Tracks in Cluster 1 TrackId: 0 PdgCode: 321
Tracks in Cluster 2 TrackId: 0 PdgCode: 321
Tracks in Cluster 3 TrackId: 0 PdgCode: 321
Tracks in Cluster 4 TrackId: 0 PdgCode: 321
Tracks in Cluster 5 TrackId: 0 PdgCode: 321
...


It looks some charged particles fired the EMC crystals but they are treated as "neutral candidates".

With best regards,
Lu
  • Attachment: Canvas_1.png
    (Size: 18.24KB, Downloaded 408 times)
 
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