Research on the Software of Track Reconstruction in Vertex Chamber of BESⅡ

ZENG Yu; MAO Ze-Pu

Chinese Physics C> 2003, Vol. 27> Issue(9) : 808-812

Research on the Software of Track Reconstruction in Vertex Chamber of BESⅡ

ZENG Yu ,
MAO Ze-Pu ^,

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

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Abstract：
The software of track reconstruction of the vertex chamber of BESⅡ-VCJULI was studied when it was transplanted from the HP-Unix platform to PC-Linux. The problems of distinct dictionary storage and precision treatment in these two different platforms were found and settled in the modified software. Then the obvious differences of the candidate track number in an event and some track parameters caused by them were reduced from 74% to 0.02% and from 5% to 0.5%, respectively. As a result, the quality of the track finding was greatly improved and the CPU time saved.

References

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. BES Collab.Nucl.Instr.Meth.,2001,A458:627 2. LIU Jing.Postdoctoral Report of CCAST ,1998(in Chinese)(刘靖.CCAST博士后出站报告,1998)3. LIU T R et al.Proceedings of CHEP 2001,2001,974. CHEN G P et al.The 5th BES Annual Meeting,1996,1155. Grote H .Rep.Prog.Phys.,1987,50:473 6. James F .MINUIT Usersguide,Program Library,CERN ,1992,D506 7. CHEN Guang-Pei et al.High Energy Phys.and Nucl.Phys.,1998,22:985(in Chinese)(陈光培等.高能物理与核物理,1998,22:985)8. MAO Ze-Pu et al.High Energy Phys.and Nucl.Phys.,1993,17:193(in Chinese)(毛泽普等.高能物理与核物理,1993,17:193)9. Walter Toki.The 5th BES Annual Meeting,1996,195

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ZENG Yu and MAO Ze-Pu. Research on the Software of Track Reconstruction in Vertex Chamber of BESⅡ[J]. Chinese Physics C, 2003, 27(9): 808-812.

ZENG Yu and MAO Ze-Pu. Research on the Software of Track Reconstruction in Vertex Chamber of BESⅡ[J]. Chinese Physics C, 2003, 27(9): 808-812. shu

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Received: 2003-01-14
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

Research on the Software of Track Reconstruction in Vertex Chamber of BESⅡ

ZENG Yu
MAO Ze-Pu ^,

Corresponding author: MAO Ze-Pu,

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

Received Date: 2003-01-14
Accepted Date: 1900-01-01
Available Online: 2003-09-05

Abstract: The software of track reconstruction of the vertex chamber of BESⅡ-VCJULI was studied when it was transplanted from the HP-Unix platform to PC-Linux. The problems of distinct dictionary storage and precision treatment in these two different platforms were found and settled in the modified software. Then the obvious differences of the candidate track number in an event and some track parameters caused by them were reduced from 74% to 0.02% and from 5% to 0.5%, respectively. As a result, the quality of the track finding was greatly improved and the CPU time saved.