1. why use E/p to identify particle.
Maybe Yuzhen could give the answer in the following Journal Club.
2. why can we add bremsstrahlung photon candidates found within a cone of 100mrad?
To salvage lepton pairs.
1. why don't we set the size of crystal smaller than 5.2*5.2-6.4*6.4?
To ensure EMC crystal could absorb all energy .
2. how can PD get information?
Photon getting into crystal can be go directly or be reflected to PD.