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Re: Mass calculation from vector<PndEmcDigi*> in EMC [message #8596 is a reply to message #8592] Tue, 19 May 2009 17:18 Go to previous messageGo to previous message
Bertram Kopf is currently offline  Bertram Kopf
Messages: 110
Registered: March 2006
continuous participant
 From: *ep1.ruhr-uni-bochum.de
Dear Donghee,
the method "Double_t PndEmcCluster::Mass() const" is helpful for the distinction between real photons and faked photons (e.g. merged pions). It calculates the so-called "invariant shower mass" of the cluster which is in principle a specific property for the description of the shower shape. For this, each fired crystal will be assosiated with a four vector (mass=0) and afterwards this function calculates the invariant mass of all theses four vectors. This is the reason for the iteration of the digis.
In case of a real photon one expects a shower mass around 0. For merged pi0's instead the shower mass is in general higher and expected to be close to the pi-mass.

Cheers,
Bertram.

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