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STAR-TOF and Related Physics

STAR-TOF and Related Physics. Jian WU for the STAR Collaboration Department of Modern Physics, USTC. Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlook. Introduction S olenoidal T racker A t R HIC ( STAR ).

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STAR-TOF and Related Physics

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  1. STAR-TOF and Related Physics Jian WU for the STAR Collaboration Department of Modern Physics, USTC Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlook J.WU USTC

  2. IntroductionSolenoidalTrackerAtRHIC(STAR) J.WU USTC

  3. IntroductionWhy STAR-TOF ? TPC dE/dxfor low momentum range: π/K 0.6 GeV/c proton/meson 1.0GeV/c • Identified hadron spectra • freeze-out dynamics • hadronization mechanism • Identified particle correlations • Chemical and kinetic properties of in-medium jet associated spectra • Fluctuations and correlations • Lepton program • In-medium vector meson properties • Heavy flavor • Baseline detector for future upgrades TOF will extend momentum range of PID ! J.WU USTC

  4. IntroductionSTAR-TOF requirement • Good overall timing resolution: < 100 ps in Au+Au collisions. • Small occupancy per channel: < 10%. • Rate capability: 200 Hz/cm2. • High efficiency: > 90%. • Fit into CTB. • Safe and not impair the performance of other STAR detectors J.WU USTC

  5. IntroductionSTAR TOF group BNL, LBL, MEPI, NASA, UNAM, RICE, UCLA, UT-Austin, U. Washington, Yale Electronics, tray assembly, andintegration & Huazhong Normal University, IHEP(Beijing), IMP(Lanzhou), SINAP, Tsinghua, USTC Module construction andQA Project supported by DOE & NSFC J.WU USTC

  6. Performance of STAR-TOF prototypesDesign of Multi-gap Resistive Plate Chamber for TOFr Technology First developed by ALICE-TOF group E. Cerron Zeballos et al. Nucl. Instr. Meth. A 374, 132(1996) M.C.S. Williams et al. Nucl. Instr. Meth. A 478, 183(2002) MRPC Strip size： 3.15cm×6.30cm Gas gap： 6×0.22mm J.WU USTC

  7. Performance of STAR-TOF prototypesTOFr1 Tray Configuration Cover 6 in azimuth and 1 in pseudo-rapidity at radius ~ 2.2m J.WU USTC

  8. Performance of STAR-TOF prototypesTray LevelTOFElectronics (Final) J. Schambach ， DOE TOF Review J.WU USTC

  9. Performance of STAR-TOF prototypesTOFr1 Tray in STAR J.WU USTC

  10. Performance of STAR-TOF prototypesTOF Starter:pseudo-VertexPositionDetector ±5.4m , 4.43<||<4.94, ~19% (But major upgrade since 2006) J.WU USTC

  11. Performance of STAR-TOF prototypesAchievements from the prototype • 86 ps overall timing resolution achieved in 200GeV Au+Au collisions. • 3.15 cm  6.30 cm, small granularity • Rate capability: ~300 Hz/cm2 (test beam, CERN) • High efficiency: > 95% • Will benefit from or enhance the performance of other STAR detectors J.WU USTC

  12. Performance of STAR-TOF prototypesTime resolutions in Runs J.WU USTC

  13. |1/β-1|<0.03 Performance of STAR-TOF prototypesHadron/Electron PID capability Hadron PID: (, K) ~1.6 GeV/c p ~ 3 GeV/c. STAR Collaboration, PLB616(2005)8 Clean electron PID can be obtained up to PT< 3 GeV/c.  This has been used to measure the semi-leptonic decay of open charm.STAR Collaboration, PRL94(2005)062301 J.WU USTC

  14. e π μ Performance of STAR-TOF prototypesMuon identification at low pT 0.15<pT<0.25 GeV/c, DCA<3cm Chen ZHONG (SINAP) J.WU USTC

  15. Performance of STAR-TOF prototypesΦ identification power STAR Preliminary TOF+TPC : the 2 kaons from Φare identified using TOF & TPC respectively TPC+TPC : the 2 kaons from Φ are identified using only TPC J.WU USTC

  16. TPC Performance of STAR-TOF prototypesPID by combining TOF+TPC TOF alone, (, K) ~1.6 GeV/c , p ~ 3 GeV/c. TOF+dE/dx+rdE/dx ( ,p) 0.3~12 GeV/c M. Shao et al., NIMA 558, (419) 2006 J.WU USTC

  17. Physics results achieved Phys. Rev. Lett. 97 152301(2006) J.WU USTC

  18. Physics results achieved • Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at 200 GeV, Phys. Rev. Lett. 97 152301(2006) • PID Cronin Effect in d+Au, Phys. Lett. B 616 (2005) 8 • Charm Cross section and spectra in p+p, d+Au, Phys. Rev. Lett. 94 (2005) 062301 • A lot of conference proceedings, QM04, SQM04, QM05, SQM06 talks. • Two Ph. D theses. • 9 NIMA publications:Nucl.Instrum.Meth.A 478:176-179, 2002 (B. Bonner et al) Nucl.Instrum.Meth.A 492:344-350, 2002 (SHao Ming et al)Nucl.Instrum.Meth.A 508:181-184, 2003 (B. Bonner et al) Nucl.Instrum.Meth.A 533:60-64, 2004 (F.Geurts et al) Nucl.Instrum.Meth.A 537:698-702, 2005 (Wang Yi et al) Nucl.Instrum.Meth.A 538:243-248, 2005 (Wu Jian et al)Nucl.Instrum.Meth.A 538:425-430, 2005 (Wang Yi et al) Nucl.Instrum.Meth.A 547:334-341, 2005 (Zhao Yan e et al) Nucl.Instrum.Meth.A 558:419, 2006 (Shao Ming et al) • More to come from prototype TOFr Imagine what we can accomplish with Full TOF (120 trays) J.WU USTC

  19. Physics results expectedPhysics with Full Barrel TOF - I Event reduction factor (achieving the same signal statistical significance) J.WU USTC

  20. Physics results expected Physics with Full Barrel TOF - II TPC+TOF+SSD+HFT ~ 200M Central AuAu events : 22Kand 6K vector meson pairs for one year RHIC running J.WU USTC

  21. Physics results expectedPhysics with Full Barrel TOF - III J.WU USTC

  22. Summary and outlookStatus & Plans • Status • MRPC Standard production procedure setup • Quality check measurements defined • Web Parameter Database installed • 132 MRPCs sent to US already for 4 tray run J.WU USTC

  23. Summary and outlookStatus & plans Production Facility at Tsinghua (Left) & USTC (Right) J.WU USTC

  24. Summary and outlookStatus & plans Tray assembly instruments at UT-Austin G. W. Hoffmann，DOE TOF Review J.WU USTC

  25. Summary and outlookStatus & plans TOFr5 for Runs 5 & 6 W.J. Llope， DOE TOF Review J.WU USTC

  26. Summary and outlook • The advantages of new technology – MRPC: good timing resolution, high efficiency , low cost to enable large acceptance etc. • The prototype of TOF detectors in STAR work well, and satisfy the requirements proposed. σt ~ 86 ps , efficiency ~ 95% • TOF prototype detectors have already provided important physics results and a full TOF will provide more ! J.WU USTC

  27. The End Thanks! J.WU USTC

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