1.  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 APS Physics April Meeting 2013 Jin Huang 1

2. Jin Huang Los Alamos National Lab For the PHENIX Collaboration

3. APS Physics April Meeting 2013 Jin Huang 3  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, …) (DCA)

4. Run13 Run12 FVTX → IR  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 ON Logged 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 √S NN = 200 GeV Cu+Au Logged all Cu+Au physics data  Early Mar 2013– Physics production for 510GeV p+p  Mid Mar 2013– New in production: rel. lumi monitoring APS Physics April Meeting 2013 Jin Huang 4

5.  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 APS Physics April Meeting 2013 Jin Huang 5 FVTX-VTX Event Display 510 GeV p-p Further matching to Muon Tracker Clusters Event Display 200 GeV U-U One of two arms shown Plot by Aaron Key (UNM) FVTX-VTX Track

6. 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 APS Physics April Meeting 2013 Jin Huang 6 Align Station Align Wedges Residual (μm) FVTX sectors Δφ~7.5 º per sector

7.  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) APS Physics April Meeting 2013 Jin Huang 7 Run12 √S = 510 GeV p-p Data DCA R (cm)

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

9.  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 Run12 Data Cu+Au √S NN = 200 GeV Plot by Shengli Huang (Vanderbilt U.)

10. APS Physics April Meeting 2013 Jin Huang 10 Readout Chip Sensor Exp Hall DAQ Room Hit Driven  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) Interface

11.  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 (δA Stat <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) Run13 √S = 510 GeV p-p Data Hit-scaled scalars Run13 √S = 510 GeV p-p Data Two station coincidental scalars RHIC abort gap Empty bunches

12.  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 √S NN = 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 APS Physics April Meeting 2013 Jin Huang 12

13. APS Physics April Meeting 2013 Jin Huang 13

14. APS Physics April Meeting 2013 Jin Huang 14

15.  Drell-Yan A LL can cleanly access Δ ū / ū  Compared with RHIC-W, access smaller x 2  Comparing with previous measurement (DIS), no fragmentation process is involved, high Q 2  provides unique check on global fits APS Physics April Meeting 2013 Jin Huang 15 Run12+13 projection

16.  DY SSA (A N ) gives access to quark Sivers effect (f 1T ⊥ ) in proton  Good handle on background  f 1T ⊥ expected to reverse in sign from SIDIS to DY measurement An important test for TMD framework APS Physics April Meeting 2013 Jin Huang 16 3-year running projection proton μ-μ- μ+μ+ lepton pion Semi-inclusive DIS (SIDIS) Drell-Yan Courtesy to M. Burkardt

17. APS Physics April Meeting 2013 Jin Huang 17 p-p √s = 510 GeV Run12 data J/Ψ High-mass DY ϒ-states J/Ψ Drell Yan charm beauty Invariant mass (GeV) S/B contributions w/o vertex detector High-mass DY Ψ’Ψ’

18. (DCA)  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 APS Physics April Meeting 2013 Jin Huang 18 DCA < 1 σ cut: Increase DY/bgd ~ 5:1 More discussion on FVTX-DCA: J. Bok’s talk – Instrumentation VI Drell Yan beauty Charm (much lower yield) combinatorial background