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  1. Talk info Jin Huang <> • Main focus • Instrumentation talk on FVTX • FVTX commissioning and analysis update in Run12/13 • New functionality • Relative Lumi monitor, reaction plane detector and trigger options • Schedule • Saturday, April 13, 2013, 2:42 PM–2:54 PM • 10 page for 10 min talk • Session C9: Ultrarelativistic Heavy Ions: Quarkonia, Heavy Flavor, Chair: Richard Seto • Related talks • Same session - Yaping Wang - Intermediate Silicon Tracker for STAR HFT Upgrade • Sunday -   Abraham Meles – FVTX for W • Sunday – Darshana Perera – FVTX for DY

  2. Recent Update for Forward Silicon Detector of the PHENIX Experiment Jin HuangLos Alamos National Lab For the PHENIX Collaboration

  3. Forward vertex detector (FVTX) = 1.2 VTX  = 2.4 FVTX (S) FVTX (N) VTX (DCA) Jin Huang <> FVTX – forward silicon vertex detector with 1M strips along azimuthal direction, 75 μm pitch in R, 96 azimuthal seg. Differentiate primary vertex / secondary decay using DCA Precisely measure di-muon opening angle Joint tracking with Muon Tracker : suppress decay-in-flight and mis-reconstruction Track isolation : suppress hadrons from jet for W measurement New function development (Reaction plane, rel. lumi., triggers, …)

  4. FVTX Commissioning and operation FVTX → IR Run12 Run13 Jin Huang <> Oct-Dec 2011 – Detector final assembly and test Quality check on all wedges Late Dec 2011 – First data from PHENIX IR Late Jan 2012 – First full detector readout from IR Feb 24 2012 – First physics data with 1/6 acceptance Mid March 2012 – Detector operational for p-p with ~90% of acceptance ONLogged all √S = 510 GeV p-p data Late March 2012 – Detector operation by shift workers Mid Apr 2012 – Commissioning for Heavy ion running End May 2012 – Production for √SNN = 200 GeV Cu+AuLogged all Cu+Au physics data Early Mar 2013– Physics production for 510GeV p+p Mid Mar 2013–New in production: rel. lumi monitoring

  5. Recent software development FVTX FVTX FVTX-VTX Event Display510 GeV p-p VTX VTX Clusters FVTX Event Display200 GeV U-U One of two arms shown FVTX-VTX Track Further matching to Muon Tracker Plot by Aaron Key (UNM) Jin Huang <> • Hough transformation based tracking • Compare with progressive tracking, improved tracking speed by 20x for heavy ion analysis • <1s per CuAu central event • Multi-vertex finder which cover full PHENIX vertex range • Tracklet-based isolation cone cuts: extract DY and W signal in pp

  6. Detector alignment Align Station Align Wedges Residual (μm) FVTX sectors Δφ~7.5º per sector Jin Huang <> Run13: FVTX self-alignment finished within few day of data taking Based the MELLEPED-II packet (refit 1M track and FVTX geometry simultaneously) Using a φ-constraint fit designed for alignment purpose First align stations then wedges Overall deviation from ideal ≲100 um

  7. Recent Analysis 1 – DCA measurement Run12 √S = 510 GeV p-p Data DCAR (cm) Jin Huang <> DCA provide powerful tool to separate prompt and heavy flavor component of charged particle production Illustrated σ~350um DCA resolution for Run12 √S = 510 GeV p-p Data Will be improved after evolving of vertex finding (software improvement, or in heavy ion collision)

  8. Recent Analysis 2 improved dimuon measurement μ+ μ- Muon tracks through ~1m of iron Dimuon spectrum of Run13 510 p-p data A. U. South arm Like-sign subtracted • PHENIX muon track reconstructed after hadron absorber (1.1m Fe+0.2m Cu) • Track angle smeared due to multiple scattering • δθRMS ≈ 20mrad @ 10 GeV/c • FVTX contributes tracklet before the absorber • Precisely determine the of dimuon opening angle • Significantly improved invariant mass resolution Plot by Matt Durham (LANL) μ+μ- Invariant Mass (GeV)

  9. Reaction plane detection Run12 Data Cu+Au √SNN = 200 GeV Plot by Shengli Huang (Vanderbilt U.) • Reaction plane in heavy ion collision • Important for studying the collective geometry of participating nucleons • Defined by beam direction and impact distance • Measured by azimuthal asymmetry of particle production • FVTX for RP measurement • Full azimuthal coverage and 96 azimuthal segments • Unique eta range in PHENIX RP measurement • High channel segmentation and statistics • Factor of two improvement w.r.t. BBC observed

  10. New functionality allowed by DAQ design Exp Hall DAQ Room Hit Driven Interface 17k LVDS 3.2 Tb/s 768 fibers 1.9 Tb/s Readout Chip Sensor Hit Driven 24 Readout cards 384 Silicon Detectors 1M channel 48 Front End Modules Jin Huang <> FVTX DAQ design : all hit info stream to DAQ room, which allow building new functionalities based on this rich information FVTX Trigger (proposed): trigger on high multiplicity events or tracks using FPGA-based lookup tables, to filter rare events Measure bunch-bunch relative luminosity (implemented, next page)

  11. New functionality – Relative Luminosity Monitor for high precision spin asymmetry measurement RHIC abort gap RHIC abort gap Empty bunches Run13 √S = 510 GeV p-p Data Hit-scaled scalars Run13 √S = 510 GeV p-p Data Two station coincidental scalars • Relative lumi important for PHENIX forward spin program. High statistic precision in run13 (10-4) call for new method to cross check and confirm measurement (BBC & ZDC) • FPGA-based scalar implemented to count FVTX hits without prescale • Very high statistics (δAStat<10-4 per 1hour run) • Proportional to luminosity in each beam bucket (120 in RHIC) • 192 segmentation in scalar configuration and two flavors of scaling to provide systematics check Plot by Aaron Key (UNM)

  12. Conclusion Jin Huang <> • Forward Silicon Detector (FVTX) provide new detection capability for the PHENIX experiment • Including Vertex finding/DCA/joint tracking/opening angle/Background rejection • Successfully commissioned at early part of the 2012 run • Production data on tape • Run12 √S = 510 GeV p-p • Run12 √SNN = 200 GeV Cu+Au • Run13 √S = 510 GeV p-p on-going as we speak • Analysis on-going, stay tuned for physics results • Physics progress update : Session L9 Abraham Meles (pp→W) and Darshana Perera (pp→γ* →μ+μ-) • New capability implemented or coming • Reaction plane, relative lumi, trigger

  13. Backup Jin Huang <>

  14. Scalar reading for run 387292 Jin Huang <>

  15. DY longitudinal DSA (ALL) Run12+13 projection Δ u / u ~0.2 for our x1~0.06 HERMES and JLab data Jin Huang <> Drell-Yan ALL can cleanly access Δ ū / ū Compared with RHIC-W, access smaller x2 Comparing with previous measurement (DIS), no fragmentation process is involved, high Q2 provides unique check on global fits

  16. lepton lepton proton μ- μ+ pion proton DY Transverse SSA (AN) 3-year running projection proton Semi-inclusive DIS (SIDIS) Drell-Yan Courtesy to M. Burkardt Jin Huang <> DY SSA (AN) gives access to quark Sivers effect (f1T⊥) in proton Good handle on background f1T⊥ expected to reverse in sign from SIDIS to DY measurementAn important test for TMD framework

  17. J/Ψ Drell Yan ϒ-states beauty charm Measuring forward di-muon pairs p-p √s = 510 GeV Run12 data J/Ψ Low-mass DY High-mass DY S/B contributionsw/o vertex detector High-mass DY Low-mass DY Ψ’ Invariant mass (GeV) Jin Huang <> • Signal divided into three regions • High-mass DY • 4 GeV < M < 8 GeV • Dominated by beauty decay background if w/o FVTX • J/Ψ • Mass resolution ~ 150 MeV • Relatively clean signal ~10:1 s/b • Low-mass DY • M < 2.5 GeV • Dominated by combinatorial and charm background if w/o FVTX

  18. Drell Yan Charm (much lower yield) beauty combinatorial background Extracting DY signal with FVTX-DCA cuts (DCA) DCA < 1 σ cut: Increase DY/bgd~ 5:1 Jin Huang <> DCA cuts improve DY signal-to-background (dominated by beauty) ratio from 1:1 to 5:1 for high mass region Expect first polarized DY measurement! Studies on low-mass DY also suggest promising signal More discussion on FVTX-DCA: J. Bok’s talk – Instrumentation VI