BESⅢ主漂移室基于模式匹配的径迹重建.pdf

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1、1 31?1 6 2007 c 6?p U?n?nHIGHENERGYPHYSICSANDNUCLEARPHYSICSVol.31,No.6Jun.,2007BES000?u?“?,?*?1;1)?1;2)o?2;3)fL2;4)r2?2,3?2,3?V?2,3f?2cxm4a“2?2,3?2?2)2424SD2(2,3o?2of2?S2?-5?2qZ?1?u2?x?2?2,3GR2?2,3?2k?4|I%2#m2?2IL2,3?Q2,3?22,3?21(?LH250100)2(I?pU?n?fi100049)3(I?)?fi100049)4(?fi?n?fi100871)5(?H?41008

2、2)?BES0?,?MdcPatRec,?E?C+mu?.T?“?“,?,?,?1?.?1?u?,(JLT,?U?Jp?E,?I?O?.?k?|D(U?,?vBES0?.?cBES0,?“?,?1?fi?KfEBEPC/1?3?E?,Oy32007cy?Kf?E.?fi?BES02BEPC/?#?p?&?,?u?0f?n!?rf?n!D/Ds?n?f?n?.BES0d?(MDC)!?1?mO?(TOF)!?U?(EMC)?f?O?(MUC)4?f&?|.MDC?5?(?l?p?:?)?f?9u?f?O?fU?.MDC?,?BES0l?n?!?,?n?KfE?)?,?(?f?.?0?uBaBar

3、?3,?3BES0l?X?BOSS4(BES0 Of-fline Software System)mu?MDC,?S?MdcPatRec?n9?y.k?A?(?O?I.,?0?,?O,?X?u?“?,?,?,L?1?5U?.?,?MdcPatRec?1?n?(J.2BES000?(?BES0?S?f&?(?1),?S?,?F.(?.MDC?S?O?64mm?810mm,?2006 09 12 v*Ig,?7(10491300)?I?z?fBL?,?N0?u)?p?,l?)?f3|?e?|?4j,|?P?f?N?p?&E,O?f?p?m?,?m:?1,!?f?.?f3|?$;,?m?,BES0|

4、?6+1,z?f?6?,3r-?K?l?.BES0,?SMdcPatRec?f?A?,d?f,?I?n?.|?!5!?fL0?lU?g?A?3k?,?1?n5.e?MdcPatRecfl?6?10?.MdcPatRec,?,?,?L.,k?1,?1,?.,?,3?3e?8?.,?O3?n?m?1,3?m?1?,?,3n?m?1?,?.2?fl?6.2MdcPatRecfl?63.1,?“i;,?u?“?,?u?N?,?,z?1?n,?:?fl,O?m?K?fl?.?k?,?U?|?)?“i;.3,?,?z?fl?|?“i;?“?1?,?|?,.?E?“i;?r,y?S?,?r,?,?“i;?8

5、,Jp,?.?E?“i;?,?,B?3e?k?U?|?,?J?yV?|?.?,|?m?(?,?3?S&?j?m?,d?mAu?I,?O?u&?j?m?l?,?“?m?”5.BES0?&?j?O?m?,?L?m?j?,?1&?j?l?m?.?f?&?j?,(?m?“,?;?“?”?“i;.i;?“?,d?8?&?j|?&?j|?(?3).?“i;k?a?“?e?4?k,?4?“,k8|?;e?3?k,?3?“,k22|?.?4?3?“k?A?eZ“?”?“,u?1j?m?O.3?,?572p U?n?n(HEP&NP)131?3.2,?“?3?1,?j?j?,.k?z?dS?12?,?g?z?j

6、?:,?3?7?j,du?j?3?S5,?e?j3?m?,U?j?5?,?y?jm?mX.,?&?j|?8?&?j?k&?N?8?“,XJ?“?i;?A?“?K?T?“?,.z?&?j?m?OflKdT?“?“?”?“(.?X,?1?,?j?K?K?r-?,?j3r-?:?1?.Hk?:,?1X?,?,U?S?3,?L,K?,?“?L.3.3,?L?“?,?L,?,.,?3j?j?O?1,3,?Kf?mS?,L?z2ru?,?,?,|.j?0?,rj?,?,.?j?z0?4?cot?.?3n?mr?j?,?,?m?.3.4,?9,?O?,?!”:?n?,?,3r-?K?l?m?1?.?2?8?

7、,2?O?.2?2=nXi=1?driftidocaii?2,(1)?drifti?,?1i?l,docai?,?1i?&?j?,3?m?C?l,i,?l?.?LgS?,?5?,?,?“?PP(d0,0,z0,tan).(2)4?,.?,?E:?:;d0,3r-?C:?:?l,l?:w?,?,_?$?d0?;0?C:?,?;z0?z?C:?:?l;?,?,?;tan,3-z?K?.4?,4MDC,?5U?,?5L?(J?Ak?(J?5u?.?LuGeant46mu?BES0&?SBOOST7(BES0 Object Oriented Simulation Tool)?)?.?!,5U?L,?j

8、?mE?l?X?g?6?(J8,?,?j?98%,?mE?122m?(dE/dx);4?cos?(0.93,0.93);?(0,2);?k?,fl!?e+e?+V,fl9?D(?fl.4.1?,?5U?,?,?!?fa9?f?.?u?,?,?)?5?f?,fl(e,K+,p).?)?PC?D(,?30.05GeV/c?1.25GeV/c.MdcPatRec?1?,u?f?,?Cz.?=Nrec/Nmc,(3)?O?=p(1)/Nmc,(4)?Nmc?)?,?8,Nrec?“”?,?8.5?f3?16?BES0?u?“?,?573?S?X5(a).ue,3?f,?u0.12GeV/c?,?390

9、%?.?u0.12GeV/c?,?3?,d?E?L60%?,.duK+0f?f?,?U?dE/dx?,d3$?3?f?$.3BEPC/U,?n?a,?f?30.30.5GeV/cNC,?vBES0?.J/Ue+e+?fl?5?4?Cz?K?.d5(b)?:?4?S?399%?m,34?Ccos=0.93?,du?MDC&?,?4?ke?.?(JL,?,?3?4?!?,?u?f?k?p?.5(a)5?f(e,K+,p)?,?Pt?Cz;(b),?4?cos?Cz4.2?E?mE?E?,?,?I.6(a)?J/U?)?e+e+fl?L?f?,?31.54GeV/c,?LVpd?7.77MeV/c,

10、?E(p)/p=0.50%.?mE?g?f?g?K?E?.d?“?2,p?,?E?O?C?;u?$?,g?E?z?,?E?C?.6(b)5?f?E?/?“,K+0f?f?dE/dx?K?,?$:O?.u?1GeV/c?,?E(p)/p=0.48%,?BES0?O?.?mE?m?I,d?E5L.?:d=driftdoca,?drift?doca?“(1).?l?O?J?l?m?=?X.?J/U?e+e+fl?1?,?:?,?9,=?2?E?)?:?z,dd?mE?135m,?.6(a)e+e+fl?,?;(b)5?f?E?Pt?4.3D(?K?D(?5g&?!fM?!?6?.?.?BES/10?

11、,BES0?C?6+.dd?6?.?)?D(?D(?.D(?OO?,?J?,?E?mEC?.?u?D(?5U?K?,?)?D(Y?,?O?1GeV/c?200MeV/c?ffl.?,D(?.uBES/;.?D(?A?,D(Y?1?D(A11.3D(Y10%?,?D(A?L1.L1BES/D(?.310%D(Ye?D(A?12345611D(A/%10.07.04.42.01.0?D(?5UX7.7(a)w?3?U?:?D(Ye?574p U?n?n(HEP&NP)131?.?w?3D(Y$u?D(?,pudD(?D(?e?.1GeV/c?K?90%,200MeV/c?K?1GeV/c?fl$?

12、10%,?e?.7(a)?w?,?D(:?A?XD(Y?O?5O,3D(Y100%?1GeV/c?200MeV/c?,?D(:?YO?5.5%?4.7%.?E?D(Y?(JX7(b),?E?XD(Y?O?C?,3D(Y?100%?,1GeV/c?200MeV/c?EO?0.64%?0.55%.?,D(?O?,?”:E?mE?/?kC?.7(a)?D(Y?9?,?D(:?D(Y?;(b)?E?D(Y?uBES/D(?.?D(?(JL,?dD(?.k?r?U?.4.4?m?BES/?,?fl?CPU?m?.?,?3?y?:?,AT?U?m?1?,Jp?.?3?pU?O?8+lxplus?O?!:?

13、(CPU:Intel XeonTM3.2GHz,S?:2GB)?1?.ulE:?J/U?e+e e+e?e+e+fl?,?,?CPU?mO?16.4ms?17.3ms.T$1?U?vBES0?I.5?n?A?u?,?3?n?(5?5U,?(2S)+J/,J/+L?1?(8).?nL?“?+,?L?$A?,3+?+?C?*?w?J/?&?,?Od+?+?(JO?,d?MDC?E?I?.?Vpd?(J?“:=f1+(1f)2?EO?1.7MeV?13.3MeV,?BES/?7MeV?80MeV?(J?,kw?U.?(2S)K0SK0L,K0SK0L+?,?MC?85%,?BES/?41.6%?kw

14、?Jp12.8(2S)+J/,J/+L?(a)+?,Vpd?E?1.7MeV;(b)+?C?,Vpd?E?13.3MeV.6(?BES0?,?mu?fi?,?u!?o?U?L.l?fl?(J?I5w,?Mdc-PatRec?u?G?,?k?p,?E,?fl?:,?f&?n?J?16?BES0?u?“?,?575?,5UU?vBES0?.?Jp?u$?,?E:?u,?,?,N?z,?.?z(References)1BEPC/Preliminary Design Report,20022Preliminary Design Report of the BES0 Detector,Jan,20043

15、BaBar Technical Design Report,SLAC-REP-950457.19954LI Wei-Dong,LIU Huai-Min et al.The Offline Software forthe BES0 Experiment.Proceeding of CHEP06.Mumbai,20065WANG Da-Yong et al.Kalman Track Fitting for BES0.Nuclear Electronics&Detection Technology,accepted(inChinese)(?.?f?&?E?(fi?)6Agostinelli S et

16、 al(Geant 4 Collaboration).Nucl.Instrum.Methods,2003,A506:2507DENG Zi-Yan et al.HEP&NP,2006,30(5):371377(inChinese)(f?.pU?n?n,2006,30(5):371377)8LIU Jian-Bei et al.Nucl.Instrum.Methods,2006,A557:4364449Robert Kutschke,Anders Ryd.Billoir Fitter for CLEO II,CBX 96-20.199610BAI J Z et al(BES Collaborat

17、ion).Nucl.Instrum.Methods,2001,A458:62711DENG Zi-Yan et al.HEP&NP,2003,27(10):909913(in Chinese)(f?.pU?n?n,2003,27(10):909913)12BAI J Z et al(BES Collaboration).Phys.Rev.Lett.,2004,92:052001Pattern-Matching Track Reconstruction for the BES000Main Drift Chamber*ZHANG Yao1;1)ZHANG Xue-Yao1;2)LI Wei-Do

18、ng2;3)MAO Ze-Pu2;4)MA Qiu-Mei2MA Xiang2,3WANG Liang-Liang2,3WANG Ji-Ke2,3DENG Zi-Yan2YOU Zheng-Yun4WEN Shuo-Pin2BIAN Jian-Ming2,3SUN Yong-Zhao2SUN Sheng-Sen2ZHU Yong-Sheng2LIU Huai-Min2LIU Chun-Xiu2WU Ling-Hui2,3LI Hai-Bo2LI Gang2ZHANG Chang-Chun2ZHANG Ling5ZHANG Jian-Yong2ZOU Jia-Heng1QIU Jin-Fa2HE

19、 Kang-Lin2HE Miao2,3JI Xiao-Bin2YANG Ming2,3YUAN Chang-Zheng2MAO Ya-Jun4YU Guo-Wei2MO Xiao-Hu2YUAN Ye2CAO Guo-Fu2,3HUANG Bin2,3XIE Yu-Guang2,3ZANG Shi-Lei21(Shandong University,Jinan 250100,China)2(Institute of High Energy Physics,CAS,Beijing 100049,China)3(Graduate University of Chinese Academy of

20、Sciences,Beijing 100049,China)4(School of Physics,Peking University,Beijing 100871,China)5(Hunan University,Changsha 410082,China)AbstractThe tracking algorithm,MdcPatRec,is developed for the Drift Chamber of the BES0 detector usingC+language and object-oriented techniques.This algorithm uses a patt

21、ern matching method to find track segmentsand then combine them into track candidates followed by a least square fit.With the simulation data,the trackingperformances such as efficiencies and momentum resolution have been studied and results are consistent with parametersfrom detector design.The alg

22、orithm is also proved to be robust enough to process data with severe background expectedby the BES0 experiment.Key wordsBES0,track reconstruction,pattern matching,track fittingReceived 12 September 2006*Supported by NSFC(10491300)and 100 Talents Programme of CAS(U-54)1)E-mail:2)E-mail:3)E-mail:4)E-mail: