Study of BES Ⅱ Muon Counter Performance

WANG Zheng; YUAN Chang-Zheng; QI Na-Ding

Chinese Physics C> 2003, Vol. 27> Issue(8) : 716-721

Study of BES Ⅱ Muon Counter Performance

Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
The BESll Muon Counter(MUC) performance is carefully studied. The MUC cluster positions and the magnetic fields in the coil and iron york of BESⅡ are calibrated by dimuon events collected at J/ψ and ψ(2S)peak energies. With these calibration constants, the MUC raw data are re-reconstructed, the offsets of hit-positions in r -φ plane are diminished, and a better resolution is achieved. The charge-division algorithm to determine the hit position in z direction is modified, which improves the z resolution to 5cm for the first layer of MUC. All these modification will make the data analyses involving MUC information more reliable.

References

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WANG Zheng, YUAN Chang-Zheng and QI Na-Ding. Study of BES Ⅱ Muon Counter Performance[J]. Chinese Physics C, 2003, 27(8): 716-721.

WANG Zheng, YUAN Chang-Zheng and QI Na-Ding. Study of BES Ⅱ Muon Counter Performance[J]. Chinese Physics C, 2003, 27(8): 716-721. shu

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Received: 2003-01-09
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of BES Ⅱ Muon Counter Performance

Corresponding author: WANG Zheng,

Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2003-01-09

Accepted Date: 1900-01-01

Available Online: 2003-08-05

Abstract: The BESll Muon Counter(MUC) performance is carefully studied. The MUC cluster positions and the magnetic fields in the coil and iron york of BESⅡ are calibrated by dimuon events collected at J/ψ and ψ(2S)peak energies. With these calibration constants, the MUC raw data are re-reconstructed, the offsets of hit-positions in r -φ plane are diminished, and a better resolution is achieved. The charge-division algorithm to determine the hit position in z direction is modified, which improves the z resolution to 5cm for the first layer of MUC. All these modification will make the data analyses involving MUC information more reliable.

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Study of BES Ⅱ Muon Counter Performance

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