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The W program at PHENIX R. Seidl (University of Illinois and RBRC) for the PHENIX Collaboration Workshop on Parity Violating Spin Asymmetries BNL, April.

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Presentation on theme: "The W program at PHENIX R. Seidl (University of Illinois and RBRC) for the PHENIX Collaboration Workshop on Parity Violating Spin Asymmetries BNL, April."— Presentation transcript:

1 The W program at PHENIX R. Seidl (University of Illinois and RBRC) for the PHENIX Collaboration Workshop on Parity Violating Spin Asymmetries BNL, April 26-27 th

2 R.Seidl:The W physics program at PHENIX 2 PVSA, BNL April 27 th Motivation for W physics I: sea polarization Parity violating decay selects quark flavor: Forward/backward region selects valence/sea quark helicity contribution High luminosity and high √s=500 GeV needed Only  ± detected  control of backgrounds important High energy muon trigger necessary Advantages of W as probe: Large Scale ( ~m W ) no Fragmentation functions required

3 R.Seidl:The W physics program at PHENIX 3 PVSA, BNL April 27 th Motivation for W physics II: asymmetric (unpolarized) sea? Asymmetry between d(x) and u(x) seen at E866, HERMES and NA51 Test asymmetry in W production w/o possible nuclear effects Also high-x behavior of u(x)/d(x) can be tested

4 R.Seidl:The W physics program at PHENIX 4 PVSA, BNL April 27 th Philosophy (initial design): Philosophy (initial design): High rate capability & granularity High rate capability & granularity Good mass resolution & particle ID Good mass resolution & particle ID  Sacrifice acceptance The PHENIX Detector     detection Electromagnetic Calorimeter      Drift Chamber Ring Imaging Čerenkov Counter Heavy quarks Muon Id/Muon Tracker Relative Luminosity Beam Beam Counter (BBC) Zero Degree Calorimeter(ZDC) Local Polarimetry - ZDC

5 R.Seidl:The W physics program at PHENIX 5 PVSA, BNL April 27 th Necessity of muon trigger upgrade Hadronic decays dominate muon rates W dominate only above 20-25 GeV DAQ cannot take full rate @500GeV Current muon trigger momentum “blind”  Need for a momentum sensitive muon trigger  Add Resistive Plate Counters(RPCs)  Add fast readout electronics for Muon tracker

6 R.Seidl:The W physics program at PHENIX 6 PVSA, BNL April 27 th PHENIX muon trigger upgrade RPC1(a+b) RPC2 RPC3 r=3.40m MuTr (I)Three dedicated trigger RPC stations (CMS design): RPC1(a,b): ~180 segments in , 2 in θ RPC2: ~360 segments in , 2 in θ RPC3: ~360 segments in , 2 inθ (Trigger only – offline segmentation higher) NSF (Funded) JSPS (Funded) (II)MuTr front end electronics Upgrade to allow LL1 information

7 R.Seidl:The W physics program at PHENIX 7 PVSA, BNL April 27 th Resistive Plate Counters Challenges: Equip large areas (RPC2 ~22 m 2 ) Limited space (smallest ~30cm) Varying rates from pp to Heavy Ion  Bakkelite RPCs: Modules can cover larger area Lower resistivity than glass  higher rate capability Thickness of a module only ~3cm -HV GND Read out Collaborative effort between groups in Korea, China, several American universities and BNL

8 R.Seidl:The W physics program at PHENIX 8 PVSA, BNL April 27 th Limited space for installation RPC2

9 R.Seidl:The W physics program at PHENIX 9 PVSA, BNL April 27 th Sideview of PHENIX with RPCs RPC3 South RPC2 South RPC2 North RPC3 North

10 R.Seidl:The W physics program at PHENIX 10 PVSA, BNL April 27 th New MuTRG Front End Electronics(FEE) MuTRG-TX Current FEE MuTRG-AD MuTr Chamber

11 R.Seidl:The W physics program at PHENIX 11 PVSA, BNL April 27 th Offline backgrounds in W analysis Cosmic muons –Reliable rates not available –First tests suggest a small rate Muons from Z/  decays –Z have small x-section –Z sensitive to quark helicities Fake high P T muons from low P T hadron decays

12 R.Seidl:The W physics program at PHENIX 12 PVSA, BNL April 27 th How to address fake high P T hadrons I: Absorber At early stage (2009-2010) additional absorber instead of RPC1 to reduce rate Maybe already install Tungsten instead of Cu in the nosecone ( needed for Nose Cone Calorimeter )

13 R.Seidl:The W physics program at PHENIX 13 PVSA, BNL April 27 th How to address fake high PT hadronsII: The PHENIX NoseCone Calorimeter (NCC)  +e identification  –  0 separation e/  isolation jet identification dE/dx e/  /jet triggers NCC Hadronic Electromagnetic Preshower and Shower-Max Fake hadron reduction

14 R.Seidl:The W physics program at PHENIX 14 PVSA, BNL April 27 th How to address fake high P T hadrons III: The forward Vertex detector Baseline: –4 layers –Vertical planes –75  m radial pitch, 7.5° phi segmentation (2 – 13 mm) –Maximize z and r extent to give good resolution and ≥3 hits/track as much as possible –2*600K channels Scope –Recently favorably reviewed for FY08 start –Bootstrapped by LANL LDRD funds to construct one octant prototype –Submitted proposal to DOE for FY08 funding start New Idea on hadron suppression for W physics: –Average dE/dx in 3 planes can distinguish low energetic hadrons and high energetic muons

15 R.Seidl:The W physics program at PHENIX 15 PVSA, BNL April 27 th PHENIX A L W +/- Sensitivity :  Machine and detector requirements: – ∫Ldt=800pb -1, P=0.7 at √s=500 GeV – Muon trigger upgrade! Expected Sensitivity with W measurement 2009 to 2012 running at √s=500 GeV is projected to deliver ∫Ldt ~980pb -1

16 R.Seidl:The W physics program at PHENIX 16 PVSA, BNL April 27 th vs HERMES SIDIS: large x-coverage uncertainties from Fragmentation functions W-physics: limited x-coverage High Q 2  theoretically clean No FF-info needed

17 R.Seidl:The W physics program at PHENIX 17 PVSA, BNL April 27 th Upgrade Schedule 2002200320042005200620072008200920102011 MPC VTX (barrel) FVTX NCC MuTrigger R&D PhaseConstruction Phase Ready for Data

18 R.Seidl:The W physics program at PHENIX 18 PVSA, BNL April 27 th Physics Timeline 2005 2006 2007 2008 2009 …. 2012 (RHIC II) 10 pb -1 ……………………………………  275pb -1 …….. 980pb -1 √s= ……………………….. 200 GeV …………………......... 500 GeV| P= 0.5 0.6 0.7 …………………………………… Inclusive hadrons + Jets ~ 25% Transverse Physics Charm Physics direct photons bottom physics W-physics A LL (hadrons, Jets) A LL (charm) A LL (γ) AL(W)AL(W) L= 1x10 31 cm -2 s -1 6x10 31 cm -2 s -1 1.6x10 32 cm -2 s -1 see Spin report to DOE http://spin.riken.bnl.gov/rsc/ @ 200GeV @ 500GeV

19 R.Seidl:The W physics program at PHENIX 19 PVSA, BNL April 27 th Outlook: strange polarization with RHICII luminosities At high luminosities possibility to tag strangeness: –Detect muon from W decay (Muon Trigger) –Detect displaced vertex of D meson decay (VTX and FVTX detectors) Charge of  selects strange/antistrange More in Yokoya-san’s talk P 1 P 2

20 R.Seidl:The W physics program at PHENIX 20 PVSA, BNL April 27 th Summary Muon Trigger upgrade funded and progressing well First Test Octant of FEE upgrade will be ready for RUN8 First new muon Trigger available for run 10 Additional upgrades will improve offline W analysis

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