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Brief Introduction

bes3

       

        BEPCII/BESIII are a major upgrade of BEPCI/BESII at the BEPC accelerator for the studies of light and charm quarks physics and τ -charm physics with the highest accuracy achieved until now. The designed peak luminosity of the double-ring e+e−. collider, BEPCII, is 1033cm−2s−1 at about 3.7 GeV.The BESIII detector with a geometrical acceptance of 93% of 4π, consists of the following main components :