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.