Monte Carlo Simulation of Barrel Shower Counter of BESⅢ for Better Design

TIAN Ding; BIAN Jian-Guo; CHEN Guo-Ming; CHEN He-Sheng

Chinese Physics C> 2001, Vol. 25> Issue(12) : 1213-1218

Monte Carlo Simulation of Barrel Shower Counter of BESⅢ for Better Design

Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China

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Abstract：
With GEANT3 frame, we simulate the lead-scintillating fiber type barrel shower counter (BSC) of BESⅢ. The structure of BSC in the simulation is analogous to Φ Factory's, and it's thinkness is 14.4X 0. The simulations show that the shower time information read-out is necessary for improving the Z spatial resolution, the π⁰ invariant mass resolution and for rejecting fake photons. Also, the energy resolution σ E/E(6%/E), the relation of angle resolution σ with readout granularity and the relations of mass resolution of π⁰ σ m/m with light yield, attenuation length, readout granularity are given, where m is the invariant mass of π⁰ reconstructed by two photons.

References

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TIAN Ding, BIAN Jian-Guo, CHEN Guo-Ming and CHEN He-Sheng. Monte Carlo Simulation of Barrel Shower Counter of BESⅢ for Better Design[J]. Chinese Physics C, 2001, 25(12): 1213-1218.

TIAN Ding, BIAN Jian-Guo, CHEN Guo-Ming and CHEN He-Sheng. Monte Carlo Simulation of Barrel Shower Counter of BESⅢ for Better Design[J]. Chinese Physics C, 2001, 25(12): 1213-1218. shu

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Received: 2001-02-20
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo Simulation of Barrel Shower Counter of BESⅢ for Better Design

Corresponding author: TIAN Ding,

Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China

Received Date: 2001-02-20
Accepted Date: 1900-01-01
Available Online: 2001-12-05

Abstract: With GEANT3 frame, we simulate the lead-scintillating fiber type barrel shower counter (BSC) of BESⅢ. The structure of BSC in the simulation is analogous to Φ Factory's, and it's thinkness is 14.4X 0. The simulations show that the shower time information read-out is necessary for improving the Z spatial resolution, the π⁰ invariant mass resolution and for rejecting fake photons. Also, the energy resolution σ E/E(6%/E), the relation of angle resolution σ with readout granularity and the relations of mass resolution of π⁰ σ m/m with light yield, attenuation length, readout granularity are given, where m is the invariant mass of π⁰ reconstructed by two photons.