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The overview of Muon Telescope Detector project: physics and current status

The overview of Muon Telescope Detector project: physics and current status. L ijuan Ruan for STAR-MTD group ( Brookhaven National Laboratory ). Outline: Physics motivation with the STAR-MTD Simulation, R&D results, trigger details MTD status Conclusions.

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The overview of Muon Telescope Detector project: physics and current status

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  1. The overview of Muon Telescope Detector project: physics and current status LijuanRuan for STAR-MTD group (Brookhaven National Laboratory) Outline: • Physics motivation with the STAR-MTD • Simulation, R&D results, trigger details • MTD status • Conclusions http://www.star.bnl.gov/~ruanlj/MTDreview2010/mtd.htm http://drupal.star.bnl.gov/STAR/system/files/MTD_proposal_v14.pdf MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  2. STAR-MTD Physics Motivation • A large area of muon telescope detector • (MTD) at mid-rapidity, allows forthe • detection of • di-muon pairs from QGP thermal radiation,quarkonia, light vector mesons, resonances in QGP, and Drell-Yan production • single muons from thesemi-leptonic decays of heavy flavor • hadrons • advantages over electrons: no  conversion, much less Dalitz decay contribution, less affected by radiative losses in the detector • materials, trigger capability in Au+Au • trigger capability for low to high pT J/ in central Au+Au collsions • excellent mass resolution, separate different upsilon states • e-muon correlation to distinguish heavy flavor production from initial lepton pair production MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  3. Concept of Design of the STAR-MTD Multi-gap Resistive Plate Chamber (MRPC): gas detector, avalanche mode A detectorwith long-MRPCs covers the whole iron bars and leave the gaps in- between uncovered. Acceptance: 45% at ||<0.5 118 modules, 1416 readout strips, 2832 readout channels Long-MRPC detector technology, electronics same as used in STAR-TOF MTD MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  4. Single Muon and J/ Efficiency G. Lin, Yale Univ. J/ efficiency • muon efficiency at |η|<0.5: 36%, pion efficiency: 0.5-1% at pT>2 GeV/c • muon-to-pion enhancement factor: 50-100 • muon-to-hadron enhancement factor: 100-1000 including track matching, tof and dE/dx • dimuon trigger enhancement factor from online trigger: 40-200 in central Au+Au collisions MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  5. High Mass Di-muon Capabilities Quarkonium dissociation temperatures – Digal, Karsch, Satz Z. Xu, BNL LDRD 07-007; L. Ruan et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001 • J/: S/B=6 in d+Au and S/B=2 in central Au+Au • With HFT, study BJ/ X; J/ using displaced vertices • Excellent mass resolution: separate different upsilon states • Heavy flavor collectivity and color • screening, quarkonia production • mechanisms: • J/ RAA and v2; upsilon RAA … MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  6. Measure J/ψ from B Decay Y. Mohammed fromTAMU • With HFT+MTD, study BJ/ X; J/ using displaced vertices • The prompt J/ and non-prompt J/ (from B decay) can be distinguished using decay length distribution MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  7. Future Measurement Projection J/ Υ J/ J/ RAA and v2; Υ(1S+2S+3S) RAA versus Npart… 300 pb-1 200 GeV p+p (~24 weeks RHIC run) 20 nb-1 200 GeV Au+Au (~12 weeks) Different Upsilon states in 500 GeV p+p collisions can be measured with good precision from 12 weeks run. Z. Tang, USTC MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  8. Upsilon Statistics Using MTD at |y|<0.5 Delivered luminosity: 2013 projected; Sampled luminosity: from STAR operation performance Upsilon in 500 GeV p+p collisions can also be measured with good precision. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  9. High luminosity for Υ & J/ from e+e- STAR high pT J/ MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  10. Compared to Υ e+e- with HFT Material budget with HFT similar to that at year 2004 With HFT, it’s hard to separate different upsilon states; e+e- channel samples collisions of |vz|<5 cm; can not sample full luminosity due to more material at |vz|>5 cm MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  11. Distinguish Heavy Flavor and Initial Lepton Pair Production: e-muon Correlation Z. Xu, BNL LDRD 07-007; L. Ruan et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001 NA60, PRL100,022302(2008) e correlation simulation with Muon Telescope Detector at STAR from ccbar: S/B=2 (Meu>3 GeV/c2 and pT(e)<2 GeV/c) S/B=8 with electron pairing and tof association MTD: construction starts in FY2011; project completion in FY2014 R. Rapp, hep-ph/0010101 MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  12. The Details for the R&D Modules R&D from 2007 to 2011 led to a final design. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  13. Run 10 Performance: Time and Spatial Resolution L. Li, UT Austin pure muons average pT: ~6 GeV/c σ: 109 ps Cosmic ray trigger (Z. Xu) Total resolution: 109 ps Start resolution (2 TOF hits): 46 ps Multiple scattering: 25 ps MTD intrinsic resolution: 96 ps System spatial resolution: 2.5 cm, dominated by multiple scattering σ: 2.5 cm MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  14. Run 11 Performance: Spatial Resolution C. Du from Institute of Modern Physics, Lan Zhou/BNL MTD software coordinator: F. Geurts Using cosmic ray triggered data: Spatial resolution versus p: intrinsic resolution 2.4 cm before any timing correction INL correction and slewing correction under investigation. See Xinjie Huang’s talk in detail. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  15. Trigger Capability with MTD Acceptance RHIC II lumonisity in terms of collision rate: 40 k Hz; Au+Au projection: based on Run 10 prototype performance. 1 ns trigger window: 80 Hz for dimuon trigger Run10 Au+Au B. Huang, USTC/BNL MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  16. MTD Trigger System • The primary physics goal requires triggering on di-muon events sampling full luminosity. • To select muons and reject hadronic showers that punch through the magnet steel, a timing cut will be applied to the MTD signals. • Since the MTD pickup strips are ~90 cm in length and readout from both ends, the sum (E+W)/2 will be calculated in the trigger and compared to the collision time. • The average arrival time at MTD boxes in different eta region is different due to difference in path length. • The occupancy in the MTD is very low, only one east and one west signal is sent to trigger from the 60 strips of 5 MTD boxes in the same eta region at 5 nearby backlegs. This allows for a correction on the arrival time in the high eta region at trigger level. The correction could be larger than 1 ns in the highest eta region. See Jo Schambach for electronics details. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  17. MTD Trigger Study in Run 12 Chi Yang, USTC/BNL MTD hits distribution of trigger data Red: MTD_VPD_TACdiff < 6600 2hits ~ at least 2hits 1hit ~ at least 1hit 2 hits/1 hit = 595/12757 = 4.66% 2 hits with cut/2hits : 114/595 = 19.16% 2hits with 6600cut / 1hit = 114/12757 =0.89% MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  18. Organization MTD group: • Brookhaven National Laboratory: L. Ruan, Z. Xu, K. Asselta, W. Christie, C. D’Agostino, J. Dunlop, J. Landgraf, T. Ljubicic, J. Scheblein, R. Soja, A.H. Tang, T. Ullrich • University of California, Berkeley: H.J. Crawford, J. Engelage • University of California, Davis: M. Calder′on de la Barca S′anchez, R. Reed, A. Kesich • Rice University: J. Butterworth, G. Eppley, F. Geurts, W.J. Llope, D. McDonald, T. Nussbaum, J. Roberts, K. Xin, L. Bridges • University of Science & Technology of China: H.F. Chen, B.C. Huang, C. Li, M. Shao, Y.J. Sun, Z.B. Tang, X.L. Wang, Y.C. Xu, Z.P. Zhang, H. Zeng, Y. Zhou • Texas A&M University: A. Hamed, Y. Mohammed, S. Mioduszewski • University of Texas, Austin: A. Davila, G.W. Hoffmann, L. Li, C. Markert, L. Ray, J. Schambach, D. Thein, M. Wada • Tsinghua University: J.P. Chen, K.J. Kang, Y.J. Li, Y. Wang, X.L. Zhu • Variable Energy Cyclotron Centre: Z. Ahammed, P.P. Bhaduri, S. Chattopadhyay, A.K. Dubey, M.R. Dutt-Mazumdar, P. Ghosh, S.A. Khan, S. Muhuri, B. Mohanty, T.K. Nayak, S. Pal, R. Singaraju, V. Singhal, P. Tribedy, Y.P. Viyogi MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  19. MTD Schedule Design Production Design Production Design Production 10% installation for Run12, 43% for Run13, 80% for Run 14. Finish the project by Mar, 2014 MTD proposal submitted to BNL in Feb. 2010;STAR-MTD review held in Sep. 2010. The project approved and funded in May 2011. US institutions: the electronics, the assembly of the trays and the operation of the detector Chinese and Indian institutions: the fabrication of the MRPC modules MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  20. MTD in Run12 Two-pack system for the installation, designed by B. Llope and J. Scheblein, proven to be successful. MRPC built at USTC and Tsinghua, trays assembled at UT-Austin. For Run 12, 13 trays on three backlegs installed by STSG. Fully integrated into STAR Data Acquisition system since Jan. 2012. Successfully took MTD triggered events since Feb. 2012. For Run 13, module production, tray assembly and test, and electronics purchase and test on track. 60% of the full system in total expected to be installed. See Bill Llope’s talk in detail. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  21. Di-lepton measurements at STAR MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  22. Summary • MTD will advance our knowledge of Quark Gluon Plasma: trigger capability for low to high pT J/ in central Au+Au collsions excellent mass resolution, separate different upsilon states e-muon correlation to distinguish heavy flavor production from initial lepton pair production rare decay and exotics … different background contribution provides complementary measurements for dileptons • The prototype of MTD works at STAR from Run 7 to Run 11. Results published at L. Ruan et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001; 0904.3774; Y. Sun et al., NIMA 593 (2008) 430; Y. Wang et al., NIMA 640 (2011) 85. • The MTD project is funded: the construction has started and will end in Mar. 2014:10% installation for Run 12, 43% (60%) for Run 13, 80% for Run 14. • Software wise: need more manpower on data QA, matching, calibration for physics output. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  23. Backup MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  24. Comments on Simulations MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  25. The R&D Results for the MTD Long MRPC Technology with double-end readout HV: 6.3 KV gas mixture: 95% Freon + 5% isobutane time resolution: ~60 ps spatial resolution: ~1cm efficiency: >95% 950 mm 25 mm 256 mm Y. Sun et al., nucl-ex/0805.2459; NIMA 593, 430 (2008) MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  26. Fermi Lab Beam Test Results (T963 May 2-15 2007) Y. Sun et al., NIMA 593, 430 (2008) T963 spokesperson: Z. Xu HV: 6.3 KV gas mixture: 95% Freon + 5% isobutane time resolution: ~60-70 ps spatial resolution: ~0.6-1cm efficiency: >95% consistent with cosmic test results MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  27. MTD System Requirement MTD requirements: • Time resolution less than 100 ps, spatial resolution ~ 1 cm. • The mechanics design must allow a convenient replacement of individual MTD box and access to the BEMC box. • The system must be able to operate in the fringe field from 0.5 Tesla STAR magnet field. • The system must operate at low noise rate. The total noise rate should be less than 0.5 M Hz, 1 Hz/cm2. • The system must be safe, meet all BNL safely requirements. • The system must not impair the performance of other STAR detectors. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

  28. MTD Trigger System • Each 12 strip MRPC is readout by 4 NINO frontend ASICs on a MINO card. Each NINO reads out 6 east ends or 6 west ends. The NINO produces a logic output signal if any of the 6 inputs is above threshold. • The 10 NINO signals and the corresponding east/west signals are logically combined by the MTRG card and a single east and west signal is sent to trigger from 5 MTD boxes in the same eta range at the 5 nearby backlegs. • Each QT can produce 8 (E+W)/2 sums. 4 QT boards required in all. • The QT is currently in use for the STAR trigger system. MTD workshop at Tsinghua Univ., Lijuan Ruan (BNL)

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