BESⅢ Track Extrapolation and Matching

WANG Liang-Liang; YUAN Chang-Zheng; MA Qiu-Mei; MA Xiang; WANG Da-Yong; DENG Zi-Yan; YOU Zheng-Yun; MAO Ze-Pu; WEN Shuo-Pin; SUN Yong-Zhao; LIU Huai-Min; LIU Chun-Xiu

Chinese Physics C> 2007, Vol. 31> Issue(2) : 183-188

BESⅢ Track Extrapolation and Matching

Institute of High Energy Physics, CAS, Beijing 100049, China2 Peking University, Beijing 100871, China3 Shandong University, Jinan 250100, China4 University of Science and Technology of China, Hefei 230026, China

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Abstract：
A GEANT4 based, Object-Oriented package, TrkExtAlg, is developed for extrapolating the BESⅢ MDC track into outer sub-detectors. The magnetic deflection and ionization loss of the particle in the BESⅢ detector is considered, the algorithm supplies the position and the momentum of the track in all the outer sub-detectors, as well as the error matrix at any given hit point with the multiple scattering effect taken into account. Through comparing the results of track extrapolation with the results of a full simulation and checking the results and application of track matching with hits in outer sub-detectors, TrkExtAlg is proved to be reliable.

References

[1]

. BAI J Z et al(BES Collab). Nucl. Instrum. Methods, 2001,A458: 6272. Cattaneo M et al. Gaudi Developer's Guide. December 20,20013. Agostinelli S et al(Geant4 Collab). Nucl. Instrum. Methods, 2003, A506: 2504. Teramoto Y. Nucl. Instrum. Methods, 2000, A449: 344-3555. DENG Zi-Yan et al. HEP NP, 2006, 30(5): 371-377 (in Chinese)(邓子艳等. 高能物理与核物理, 2006, 30(5): 371-377)

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WANG Liang-Liang, YUAN Chang-Zheng, MA Qiu-Mei, MA Xiang, WANG Da-Yong, DENG Zi-Yan, YOU Zheng-Yun, MAO Ze-Pu, WEN Shuo-Pin, SUN Yong-Zhao, LIU Huai-Min, LIU Chun-Xiu, BESⅢ Track Extrapolation and Matching[J]. Chinese Physics C, 2007, 31(2): 183-188.

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Received: 2006-04-18
Revised: 2006-05-09

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