The Beijing Spectrometer III (BESIII) is a general-purpose detector used for the study of τ-charm physics at the Beijing Electron-Positron Collider II (BEPCII). This paper presents our studies of the dE/dx measurement in the drift chamber of BESIII, which is important for the identification of charged particles. Corrections applied to the dE/dx measurement in data reconstruction are discussed. After our current dE/dx calibration, a resolution of about 6% has been obtained for minimum ionization particles, and a 3σ K/π separation is obtained for momenta up to 760 MeV/c. These results meet the design goals of the BESIII drift chamber.

S-matrix study on alignment dependence of single ionization of molecular ions with different active orbitals *Li Yan(李 燕) a) , Jia Xin-Yan(贾欣燕) b) † , Yang Shi-Ping(杨世平) a) ‡ , Li Wei-Dong(李卫东) c) , and Chen Jing(陈 京) b)d)

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