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Chinese Physics C> 1997, Vol. 21> Issue(11) : 982-989 

Energy Resolution and Its Simulation for the ESC of BES

  •  Institute of High Energy Physics, The Chinese AScademy of Sciences,Beijing 100039

  • With data collected by the Beijing Spectmmeter (BES) in the J/ψ,ψ′, and Ds energy region, a lot of e+e－ final state evenb are selected in the solid angle region covered by the endcap shower counters (ESC). Some characteristics of the ESC are analysed, such as the spectrnun of pulse height for, a single counter cell, the hit nwnbers in the ESC and in every reading layer of the ESC, the shower energies deposited in the ESC and in every layer of the BSC. The energy resoiudon of the ESC in obtained to be about 22%/E(GeV) Based on the odginal frame of SOBER, a Monte Carlo simulation program for the ESC is developed with a dual Gaussian pulse height spectrtun of the single counter cell. The electromagnetic cascades are calculated by the EGS4 package and a three-dimension magnetic field in the BES is included. The simulation results agree with experimented data well.
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  • References

    [1] 丁慧良等，高能物理与核物理,16(1992)769.[2]M. Atac et al.,Nucl. Instr. and meth,200(1982)345.[3]李金等，高能物理与核物理，15(1991)1.[4]W. R. Nelson H. Himyama, D. W. O. Rogers;The EGS4 Code System,SLAC-265(1985)[5]F. Bergsma et al, IEEE NS-30,1(1983)122:M. Atac et al, IEEE NS-30,1(1983)103;马金源等，高能物理与核物理,8(1984)142.

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Chen Jiangchuan, Zhu Yongsheng, Cheng Baosen, Liu Huaimin, Zhang Dahua, Wang Ping, Li Canguo, Huang Yinzhi and Zhang Jinlong. Energy Resolution and Its Simulation for the ESC of BES[J]. Chinese Physics C, 1997, 21(11): 982-989.
Chen Jiangchuan, Zhu Yongsheng, Cheng Baosen, Liu Huaimin, Zhang Dahua, Wang Ping, Li Canguo, Huang Yinzhi and Zhang Jinlong. Energy Resolution and Its Simulation for the ESC of BES[J]. Chinese Physics C, 1997, 21(11): 982-989. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Energy Resolution and Its Simulation for the ESC of BES

    Corresponding author: Chen Jiangchuan,
  • Institute of High Energy Physics, The Chinese AScademy of Sciences,Beijing 100039
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1997-11-05

Abstract: With data collected by the Beijing Spectmmeter (BES) in the J/ψ,ψ′, and Ds energy region, a lot of e+e－ final state evenb are selected in the solid angle region covered by the endcap shower counters (ESC). Some characteristics of the ESC are analysed, such as the spectrnun of pulse height for, a single counter cell, the hit nwnbers in the ESC and in every reading layer of the ESC, the shower energies deposited in the ESC and in every layer of the BSC. The energy resoiudon of the ESC in obtained to be about 22%/E(GeV) Based on the odginal frame of SOBER, a Monte Carlo simulation program for the ESC is developed with a dual Gaussian pulse height spectrtun of the single counter cell. The electromagnetic cascades are calculated by the EGS4 package and a three-dimension magnetic field in the BES is included. The simulation results agree with experimented data well.

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