中國與RHIC-STAR的國際合作

1、中國與中國與RHIC-STARRHIC-STAR的國際合作的國際合作馬余剛，陳宏芳，程建平馬余剛，陳宏芳，程建平中國中國RHIC-STARRHIC-STAR合作組：合作組：中國科大，清華大學(xué)，上海應(yīng)物所，中國科大，清華大學(xué)，上海應(yīng)物所，華中師大，高能所，近物所華中師大，高能所，近物所2005/6/28-292005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海outlineFChinese RHIC-STAR GroupFTOFr and Physics ResultsFImpact of Chinese RHIC-STAR GroupFPhysics with Full TOF P

2、rojectFConclusion2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Chinese RHIC-STAR Group-History and present organization2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海US-China Collaboration on STAR/ RHICFA STAR-China collaboration has been established (Six Institutions from China) University of Science and Technology of China, H

3、efei (USTC) Tsinghua University Shanghai Institute of Applied Physics (SINAP) Central China Normal University, Wuhan (CCNU) Institute of Modern Physics, Lanzhou (IMP) Institute of High Energy Physics, Beijing (IHEP)FChinese collaborators are playing a major role in physics analyses involving open ch

4、arm, Cronin effect, and elliptic flow as part of STARs focus on studies of a new state of matter (the quark-gluon plasma) at RHICFChinese groups are leading in prototyping and development for a large-area MRPC time-of-flight detector for STAR.FThis is the first major US-China collaboration on high e

5、nergy nuclear physics and we have had a very successful beginning. FThe STAR-China Time-of-Flight Construction Project has been covered under the US-PRC HEP Agreement since 2001 to ensure smooth construction of the TOF detector and operation of the STAR-China collaboration.2005/6/28-29第第59屆東方論壇，上海屆東

6、方論壇，上海Major Milestones of STAR-China TOF ProjectFCCNU and IHEP joined STAR collaboration in 1999 for TOFp; SINAP, USTC, Tsinghua and IMP joined STAR collaboration in Oct. 2001.FUSTC team began MRPC R&D in Aug. 2000 with the supports of NSFC, STAR and other Chinese collaboration institutions.FJoi

7、ned in US/PRC Cooperative Agreement on High Energy Physics since 2001 (22nd Meeting)FPrototype MRPC (multi-gap resistive plate) time-of-flight detectors, produced jointly between USTC and Rice Univ. and operated successfully in STAR (2002-3 and 2003-4 RHIC runs). Physics results on identified partic

8、le spectra and on semi-leptonic charm decays have been published.FApproval of RHIC-STAR Physics and the Construction of Barrel STAR-TOF” by the National Natural Science Foundation of China (Sept 10, 2004, Budget: 1.5M USD)FApproval of the STAR TOF upgrade proposal by BNL Technical Advisory Committee

9、 and Submission of the Proposal to DOE (July 2004)FTechnical Review of proposal by DOE, planned Aug. 2005FSuppose DOE approval in Oct. 2005, full construction start October 20052005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海MRPC TOF Barrel R&DFRUN 2002-3: TOF installed in STAR 24 MRPC modules produced at Unive

10、rsity of Science Technology China 6-channel front-end cards, with amplifiers and discriminators, CAMAC read-outFRun 2003-4: TOF installed in STAR 5 new modules from USTC and 5 from Tsinghua University, Tsinghua developed automated techniques for manufacturing 24-channel front-end cards with amplifie

11、r and discriminatorFRUN 2004-5, TOF installed in STAR, 16 new modules from Tsinghua First time use of full on-board read-out electronics: digitization of data on-board First use of ALICE PCI-PC based DAQ20022004G. Eppley et al. 2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Completed Prototype 28 module MRPC TOF T

12、ray installed in STAR Oct. 02 in place of existing central trigger barrel trayNeighborCTB TrayEMCRailsFEEMRPC design developed at CERN, built in USTC/ChinaPrototype Tray Constructionat Rice University 28 MRPC Detectors;24 made atUSTCThe STAR Barrel TOF MRPC Prototype 70 ps, 2 meter pathStrong team i

13、ncluding 6Chinese Institutions in place2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海batch production40 MRPC production， more than 80 of eligible rate , good performance in on-line testing at RHIC-STAR (Tsinghua)2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Project Leader: Yu-Gang Ma (SINAP)Deputy Leaders: Hongfang Chen (USTC)

14、 Jian-Ping Cheng (Tsinghua)Liaison person: Huanzhong Huang (UCLA)FStudies of the strong interaction matter at high temperature/density and searching for QGP (Yu-Gang Ma, SINAP) (SINAP, CCNU, USTC, Tsinghua etc.) FDesign and Mass production of MRPC modules for STAR-TOF (Jian-Ping Cheng, Tsinghua) (Ts

15、inghua, USTC) FQuality control and calibration for STARTOF (Xiao-Lian Wang, USTC) (USTC, Tsinghua)Chinese Proposal to NSFC2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海The Proposal of RHIC-STAR Full TOF ConstructionProposed major construction responsibilities: F Chinese STAR Groups: MRPC Production and Quality As

16、surance NSFC/CAS/MoST (Approved in Sept, 2004) (Special thanks for Huanzhong, Nu, Zhangbu, Xinnian et al. for many important suggestions and helps)F US STAR Groups: Electronics and Integration etc DOE Project Manager: G. Eppley (with DOE)FMonetary Contributions: China US$2.5 M (US$ 1.5M from NSFC/CA

17、S/MoST) US- DOE US$4.5 M2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海STAR TOFr and Physics Results2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海PID TPC alone PID range: pi/k 0.6 GeV/c, (pi,k)/p 1.5GeV/c;TOF “alone” PID range: pi/k 1.6GeV/c, (pi,k)/p 3.0GeV/cm2m2 TOF=110ps kpTPC aloneTOF “alone”2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海

18、Preliminary pion spectra till high pTFTPC: Pion: 0-0.6GeV/c Kaon: 0.2-0.6GeV/c Proton: 0.2-1 GeV/cTOF: Pion: 0.2-1.6GeV/cKaon: 0.2-1.6GeV/cProton: 0.2-3 GeV/c TPC+TOF: Pion: 0.-10 GeV/cKaon: 0.2-3GeV/cProton: 0.2-5 GeV/cTPC+TOF:2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Electron

19、 identificationCombined with TOF，electrons can be separated from pions cleanlyElectorns mixed with pions if only dE/dx of TPC is used to identify particlesX. Dong, Z.B. Xu, LJ Ruan, J Wu et al2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海RAuAu and Rd

20、Au of f0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.01.62.0 Phi kaon pion Proton RdAuPT (GeV/c2)0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.00.00.51.01.52.02.5STAR Preliminary RdAu RAA(6080/pp) RAA(05/pp) RdAu or RAAPT (GeV/c2)RdAu of f is closer to that of p and k than that of pParticle production at intermedi

21、ate pT region is sorted by the particles type, not the massppinelbindAuTTppineldAuTTdAuNTdydppdTdydppNdR/,)2/()2/(22_2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Preliminary results v21. the elliptic flow of -meson gives similar behavior of Ks but distinguish from 2. a NCQ-scaling has been observed in -meson3. e

22、rror bars in higt pt range (2.5GeV,5.0GeV) are still large 0-80% AMPT calc.2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Impact of Chinese RHIC-STAR Collaboration2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Organizing International workshopHost:FAug 2002: 1st International CCAST Summer School and Workshop on “QCD and RHIC Phy

23、sics” in CCAST-WL, Beijing. Organized by Profs. X.L. Wang and P. F. Zhuang. There were 15 foreign speakers invited, 100 participantsFOct 2003, 1st STAR Regional Collaboration Meeting, USTC; 10 STAR speakers invitedFAug 2004: 2nd International CCAST Summer School and Workshop on “QCD and RHIC Physics

24、” in CCAST-WL, Beijing. Organized by Profs. Y.G. Ma, E.K. Wang and J.H. Fu. There were 19 foreign speakers and 22 domestic speakers, 140 participants.FOct 2004: International Workshop on “Collective Dynamics in Relativistic Heavy Ion Collisions” USTC, Organized by X.L. Wang and Nu XuF1924 June 2005:

25、 3rd International Workshop on “QCD and RICH Physics” was organized by CCNU and CCAST et al., Wuhan; 20 foreign speakers, 140 participants2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Talk Int. ConferenceQM2006 in Shanghai:FThe proposal to host “Quark Matter 2006” in Shanghai was accepted during QM2004 in Oakland

26、. Shanghai Institute of Applied Physics and Central China Normal University will co-organize the QM2006 in Shanghai, preliminary date Nov 16-22, 2006 Co-chairs: Zhiyuan Zhu (SINAP) & Xu Cai (CCNU) Honor Chair: T. D. LeeTaks in some international conferences: Conference Talks: QM2004: one oral pr

27、esentation (Ruan) SQM2004: three oral presentations (Cai, Ruan, Ma) ICEHP2004: one oral presentation (Wu) QM2005: one Plenary Talk (Dong, from TOF phys results) one parallel talk (Cai) 2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Our excellent studentsPhD Dissertations (incomplete statistics) : Jinghua FU (CCNU)

28、: 獲獲二二五年全國優(yōu)秀博士學(xué)位論文五年全國優(yōu)秀博士學(xué)位論文 Shengli HHUANG (USTC), Lijuan RUAN (USTC)，Zhixi LIU (CCNU) Xing DONG (USTC):獲獲二二四年中國科學(xué)院院長獎學(xué)金特別獎四年中國科學(xué)院院長獎學(xué)金特別獎 Chinese Principal authors of STAR Publications or works: Jinghua Fu et al.: Flow of Ks and for 130GeV/c Au+Au (Phys. Rev. Lett. 89, 132301 (2002).) Xin Dong e

29、t al. : electron spectra fro open Charm (nucl-ex/0407006), PRL94, 062301 (2005) Lijuan Run et al.: Cronin Effect (nucl-ex /0309012 ), Phys Lett B 616, 8 (2005) Lijuan Ruan (for the STAR Collaboration), , K, p and production from Au+Au collisions at 62.4 GeV, J. Phys. G: Nucl. Part. Phys. 31 S1029-S1

30、033 (2005) Xiangzhou Cai (for the STAR Collaboration) Production of K0s, and from 200 GeV d+Au collisions at RHIC, J . Phys. G: Nucl. Part. Phys. 31 S1015-S1018 (2005) Ming Shao, Pion, Kaon, and (Anti-) Proton Production in Au+Au Collisions at srt = 62.4 GeV, J.Phys. G31 (2005) S85-S92 Shengli Huang

31、 et al.: azimuthal dependent fluctuation Zhixu Liu et al.: flow of Ks and for 63 GeV/c Au+Au Guoliang Ma et al. : flow and spectra of f f for 63 63 GeV/c Au+Au Jinhui Chen et al., phi flow Jiaxu Zuo et al., multi-strange partcile spactra, . 2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海2005/6/28-29第第59屆東方論壇，上海屆東方

32、論壇，上海Central (top 10%) collisionsacceptance with TPC: : 60% K: 60% p: 50%acceptance with TPC+TOF: 95% for all particlesS/N for f reconstruction willincrease by a factor of 5-10 v2 measurement possibleZ. Liu, F. Liu, et al.2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海1)TOF will increase V0 reconstruction efficien

33、cy. In the case of W W, a factor of 5 10 increase expected in the region pT 3-5 GeV/c!2)TOF will also help future D meson reconstruction increasing S/N ratios, same way for other resonances. 3) (D0 K+) (D0-bar K+)3) In the case for f f, a factor of 5-10 increase in S/N ratio is expected. f=K + + K -

34、 (49.1%)H. Long et al.2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海STAR TPC + TOF W v2 measurementsFor integrated W W v2 : needs few 106 MiniBias events. More events without TOF pT dependence W W v2: for 20% around pT 5 GeV/c, needs few 10th 106 MiniBias events with TOF almost impossible without TOF in middle Pt

35、 STAR 200 GeV results: T = 0.45 GeV dN/dy = 0.64, sum of W- and W+ 8% all are usable events (1.5 -3 factor)ideal With TOFw/o TOF2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海TOF and HyperonEmbedded Data: reconstruction with and without PID information!A Factor of 3 !TmmfttSB/exp Input spectrum:T = 350 MeV2005/6/2

36、8-29第第59屆東方論壇，上海屆東方論壇，上海Chinese interestsFCollective dynamics for rare particlesFHeavy flavor quarksFSearch for multi-quark state particlesFFluctuationsFCorrelation of rare particlesFHadronic evolution dynamics: resonance F.2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海how about flow of electron, f f, W W, D, J/

37、v2(p ) ? Need Full TOF for good efficiency and statistics2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Without TOFWith TOFAll pT12M2.6MpT2.59M23M2pT4.85M42M4pT6.115M115MD0 Sensitivity in pTImportant Measurement: Open CharmTOF helps by a factor of 5 (all PT)TOF + Active Pixel Sensitive: x8Other Open Charm States P

38、ossible only with TOFFull Coverage neededInitial condition J/ suppressionHeavy quark energy lossCharm quark mostly produced from the initial fusion of partons (mostly gluons)2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Time scale of resonance stateResonance K*(892) (770) f0(980) f f(1020) (1232) (1520) (1385)Dec

39、ay channel K K K ee p p K Branching Ratio % 100 100 dominant 49.2 0.3 99 22.5 88.2Width MeV 50.7 150 40 to 100 4.46 120 15.6 35.8Life time fm/c 4 1.3 40 1.6 13 5.6Resonance Parent PT(GeV/c) TPC+TOF K*0 0-1 2.0K*0 1-2 1.85K*0 2-3 1.74K*0 3-5 1.39 _f(1020) 0-2 5.0f(1020) 2-5 3.42 _(1520) 0-1.6 11.4Chemical Freeze-out - formation of hadronsKinetic Freeze-out - Interaction ceasesIncreasing factor for statistical significance of the signal2005/6/28-29第第59屆東方論壇，上海屆東方論壇，上海Discoveries from Unexpected Areas?!RHIC - Frontier for bulk partonic matter formation (quark clustering and