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Question Regarding discrimination between electrons and photons 

Forum: Particles
Date: 29 Mar, 2017
From: Debdeep Ghosal <Debdeep Ghosal>

   It might be a trivial question, but just wanted to make sure one thing about the photon and electron discrimination in E-cal. 
   To judge whether a detector is performing well or not, I think we need to quantify these factors like: What is the fraction of photons that are identified as photons or what fraction are wrongly identified as electrons? and what is the fraction of electrons that are wrongly identified as photons.
     So, if for example shooting a 30 MeV photon beam in my scintillator-lead sandwiched calorimeter, I receive the energy deposition in the scintillators around 1/3rd of 30MeV(let's say), then may I say that rest 2/3rd part of the photon has been identified wrongly as electrons since photons have created high energy electrons in the lead part of the calorimeter and thus I am missing that amount in the end as a signal? or can't I interpret like this?
     Or let's assume even if I shoot same energetic electron(30 MeV) and most of them deposit their energy in the scintillators(e.g 3/4th), then am I allowed to say that the rest 1/4th part has been wrongly identified as photons and those 3/4th part is correctly identified as electrons themselves?or not?
   Could anyone kindly comment on this issue?
thanks and regards...

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