Study of Neutral Track Measurement at BESⅡ

WANG Jun; LV Feng; TONG Guo-Liang; ZHANG Chang-Chun; HONG Tao; YUAN Jian-Ming; XU Ye

Chinese Physics C> 2002, Vol. 26> Issue(2) : 116-121

Study of Neutral Track Measurement at BESⅡ

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

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Abstract：
The measurement errors of the deposited energy and position of neutral tracks in Barrel Shower Counter (BSC) of BESⅡ are investigated. The errors of energy and position of real data are determined by radiative Bhabha events, while the errors of Monte Carlo Data are determined by e⁺e^－→γγ events. Then the corrections are tested by the selected ρπ sample, which shows better pull and Confidence Level distribution after the correction. The results are already applied to the kinematic fitting, which can improve the physics results at BESⅡ.

References

[1]

. BES Collab. Nucl. Instr. Meth., 1994, A344: 319 2. BES Collab. The BES Upgrade, Nucl. Instr. Meth., 2001, A458: 627 3. CHEN Hong-Fang et al. High Energy Phys. and Nucl. Phys., 1996, 20: 1—7(in Chinese)(陈宏芳等. 高能物理与核物理, 1996, 20: 1—7) 4. LI Hai-Bo et al. High Energy Phys. and Nucl. Phys., 1999, 23: 607—615(in Chinese)(李海波等. 高能物理与核物理, 1999, 23: 607—615) 5. HONG Tao. BES Monthly Meeting. Beijing. 2000(in Chinese)(洪涛. BES月会报告. 北京. 2000)

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WANG Jun, LV Feng, TONG Guo-Liang, ZHANG Chang-Chun, HONG Tao, YUAN Jian-Ming and XU Ye. Study of Neutral Track Measurement at BESⅡ[J]. Chinese Physics C, 2002, 26(2): 116-121.

WANG Jun, LV Feng, TONG Guo-Liang, ZHANG Chang-Chun, HONG Tao, YUAN Jian-Ming and XU Ye. Study of Neutral Track Measurement at BESⅡ[J]. Chinese Physics C, 2002, 26(2): 116-121. shu

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Received: 2001-03-14
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

Study of Neutral Track Measurement at BESⅡ

Corresponding author: WANG Jun,

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

Received Date: 2001-03-14
Accepted Date: 1900-01-01
Available Online: 2002-02-05

Abstract: The measurement errors of the deposited energy and position of neutral tracks in Barrel Shower Counter (BSC) of BESⅡ are investigated. The errors of energy and position of real data are determined by radiative Bhabha events, while the errors of Monte Carlo Data are determined by e⁺e^－→γγ events. Then the corrections are tested by the selected ρπ sample, which shows better pull and Confidence Level distribution after the correction. The results are already applied to the kinematic fitting, which can improve the physics results at BESⅡ.