Application of dE/dr Method for e/π Identification of the Measurement of the Mass of τ Heavy Lepton by BES

Rong Gang; Ma Jimao; Mao Huishun; Wang Tajie; Bai Jingzhi; Li Weiguo

Chinese Physics C> 1993, Vol. 17> Issue(S3) : 215-224

Application of dE/dr Method for e/π Identification of the Measurement of the Mass of τ Heavy Lepton by BES

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China

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Abstract：
The application of the dE/dx method for e/π identification of the measurement of the mass of τ heavy lepton by Beijing Spectrometer (BES) operated at Beijing Electron Positron Collider (BEPC) is described. With additional dE/dx information, the efficiency of selecting the eμ events from τ⁺τ^- is increased more than three-fold compared to that with traditional e/π identification by electromagnetic shower measurement alone. This results in not only reduction of the loss of the eμ events in off-line selection, but also in a 75% reduction of the amount of the time needed to run the BES/BEPC for data collection and computer CPU time for data off-line processing for selecting the same number of τ⁺τ^- events.
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Rong Gang, Ma Jimao, Mao Huishun, Wang Tajie, Bai Jingzhi and Li Weiguo. Application of dE/dr Method for e/π Identification of the Measurement of the Mass of τ Heavy Lepton by BES[J]. Chinese Physics C, 1993, 17(S3): 215-224.

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Received: 1992-10-16

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沈阳化工大学材料科学与工程学院沈阳 110142

Application of dE/dr Method for e/π Identification of the Measurement of the Mass of τ Heavy Lepton by BES

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China

Received Date: 1992-10-16

Abstract: The application of the dE/dx method for e/π identification of the measurement of the mass of τ heavy lepton by Beijing Spectrometer (BES) operated at Beijing Electron Positron Collider (BEPC) is described. With additional dE/dx information, the efficiency of selecting the eμ events from τ⁺τ^- is increased more than three-fold compared to that with traditional e/π identification by electromagnetic shower measurement alone. This results in not only reduction of the loss of the eμ events in off-line selection, but also in a 75% reduction of the amount of the time needed to run the BES/BEPC for data collection and computer CPU time for data off-line processing for selecting the same number of τ⁺τ^- events.