 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

Jin Huang Los Alamos National Lab For the PHENIX Collaboration

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)

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 – 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

 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

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

 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)

 PHENIX muon track reconstructed after hadron absorber (1.1m Fe+0.2m Cu) ◦ Track angle smeared due to multiple scattering ◦ δθ RMS ≈ 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 Run p-p data μ + μ - Invariant Mass (GeV) Plot by Matt Durham (LANL) South arm Like-sign subtracted A. 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 Run12 Data Cu+Au √S NN = 200 GeV Plot by Shengli Huang (Vanderbilt U.)

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

 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

 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

APS Physics April Meeting 2013 Jin Huang 13

APS Physics April Meeting 2013 Jin Huang 14

 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

 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

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’

(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