BESⅢ主漂移室基于模式匹配的径迹重建

1、31 6 2007 6HIGHENERGYPHYSICSANDNUCLEARPHYSICSVol. 31, No. 6Jun., 2007BES *1;11;22;3 2;422,3 2,32,32422,3 222222,32 22521222,32 2,3242222,32,32,321(250100 2(1000493( 100049 4(1008715(410082BES MdcPatRec, C+ . , . , , . , BES . BES1BEPC1, 2007 . BES 2BEPC , D/Ds .BES (MDC (TOF (EMC µ (MUC4 . MDC

2、. MDC BES , , .BaBar 3BES BOSS 4(BES Of-ineSoftware System MDC MdcPatRec . . , , . , MdcPatRec .2BESBES ( 1, . MDC 64mm 810mm,6 BES 571572 (HEP &NP 31 i2,(1drift i i , doca i i , i . , 5 , PP (d 0,0,z0, tan .(24 . ,; d 0 r - , , d 0 ; 0 ; z 0 z ; , ; tan -z.44MDC. Geant46BES BOOST7(BES Object Or

3、iented Simulation Tool. , 8, , 98%, 122µm (dE/d x ; cos (0. 93, 0. 93; (0,2; e +e µ+µ . 4.1, . , 5(e, µ, , K +, p., 0.05GeV/c 1.25GeV/c . MdcPatRec , .=N rec /Nmc ,(3=6 BES 573123456117 . 7(a574 (HEP &NP 316 BES 575 , . BES . , (References 1 BEPC 2004 3 BaBar Technical Design

4、 Report, SLAC-REP-950457. 1995 4 LI Wei-Dong, LIU Huai-Min et al. The Oine Software for the BES 2006 5 WANG Da-Yong et al. Kalman Track Fitting for BES . Nuclear Electronics & Detection Technology, accepted (in Chinese ( . ( 6 Agostinelli S et al(Geant 4 Collaboration. Nucl. Instrum. Methods, 20

5、03, A506: 250 Experiment. Proceeding of CHEP06. Mumbai, Preliminary Design Report, 2002 Detector, Jan, 2 Preliminary Design Report of the BES 7 DENG Zi-Yan et al. HEP & NP, 2006, 30(5: 371377 (in Chinese ( 436444 9 Robert Kutschke, Anders Ryd. Billoir Fitter for CLEO II, CBX 96-20. 1996 10 BAI J

6、 Z et al(BES Collaboration. Nucl. Instrum. Methods, 2001, A458: 627 11 DENG Zi-Yan et al. HEP & NP, 2003, 27(10: 909913 (in Chinese ( . , 2003, 27(10: 909913 12 BAI J Z et al(BES Collaboration. Phys. Rev. Lett., 2004, 92: 052001 . , 2006, 30(5: 371377 8 LIU Jian-Bei et al. Nucl. Instrum. Methods

7、, 2006, A557: Pattern-Matching Track Reconstruction for the BES Main Drift Chamber * ZHANG Yao1;1 ZHANG Xue-Yao1;2 LI Wei-Dong2;3 MAO Ze-Pu2;4 MA Qiu-Mei2 MA Xiang2,3 WANG Liang-Liang2,3 BIAN Jian-Ming2,3 LIU Chun-Xiu2 ZHANG Jian-Yong2 YANG Ming 2,3 WANG Ji-Ke2,3 DENG Zi-Yan2 SUN Sheng-Sen2 LI Gang2

8、 YOU Zheng-Yun4 ZHU Yong-Sheng2 WEN Shuo-Pin2 LIU Huai-Min2 ZHANG Ling5 JI Xiao-Bin2 SUN Yong-Zhao2 ZOU Jia-Heng1 CAO Guo-Fu2,3 WU Ling-Hui2,3 LI Hai-Bo2 2 ZHANG Chang-Chun2 HE Miao2,3 2 4 QIU Jin-Fa2 HUANG Bin2,3 HE Kang-Lin2 YUAN Chang-Zheng MAO Ya-Jun YU Guo-Wei MO Xiao-Hu2 YUAN Ye2 XIE Yu-Guang2

9、,3 ZANG Shi-Lei2 1 (Shandong University, Jinan 250100, China 2 (Institute of High Energy Physics, CAS, Beijing 100049, China 3 (Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4 (School of Physics, Peking University, Beijing 100871, China 5 (Hunan University, Changsha 41008

10、2, China Abstract The tracking algorithm, MdcPatRec, is developed for the Drift Chamber of the BES detector using C+ language and object-oriented techniques. This algorithm uses a pattern matching method to nd track segments and then combine them into track candidates followed by a least square t. W

11、ith the simulation data, the tracking performances such as eciencies and momentum resolution have been studied and results are consistent with parameters from detector design. The algorithm is also proved to be robust enough to process data with severe background expected by the BES experiment. , track reconstruction, pattern matching, track tting