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PHENIX VTX Upgade

Summary of the PHENIX VTX upgrade and its impact on physics research discussed at the meeting, including development status, schedule, and collaboration details. Exciting upgrades to improve studies on gluon polarization, photon-jet correlations, and more. Key insights shared by Yuji Goto from RIKEN/RBRC.

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PHENIX VTX Upgade

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  1. PHENIX VTX Upgade RHIC Spin Collaboration Meeting in Torino October 9, 2004 Yuji Goto (RIKEN/RBRC) for the PHENIX Collaboration

  2. Outline • Review of physics with PHENIX baseline system • achieved • to be achieved • Physics with PHENIX VTX upgrade • more in Manabu Togawa’s talk in Spin 2004 • status of the VTX development and construction • schedule • collaboration Yuji Goto (RIKEN/RBRC)

  3. 0 5 10 pT (GeV/c) Phys.Rev.Lett. 91 (2003) 241803 Physics with the baseline system Bazilevsky’s talk in this meeting and Fukao’s talk in Spin2004 • 0 PHENIX preliminary 0ALL p polarization scaling error 35% not included 0AN PHENIX preliminary Makdisi’s talk in this meeting and Spin2004 Yuji Goto (RIKEN/RBRC)

  4. polarization scaling error 35% not included h- PHENIX preliminary polarization scaling error 35% not included h+ PHENIX preliminary Physics with the baseline system • Charged hadron PHENIX preliminary Makdisi’s talk in this meeting and Spin2004 Yuji Goto (RIKEN/RBRC)

  5. Prompt photon Single electron Physics with the baseline system Okada’s talk in this meeting and Spin2004 Togawa’s talk in Spin2004 Yuji Goto (RIKEN/RBRC)

  6. Physics with the baseline system • J/ Phys.Rev.Lett. 92 (2004) 051802 Yuji Goto (RIKEN/RBRC)

  7. Physics with the baseline system • Gluon polarization • ALLof prompt photon • ALL of single electron • Quark polarization flavor decomposition • AL of weak boson • Transversity • with +- interference fragmentation function • with Collins effect in jet • at s = 200 GeV and 500 GeV xG(x) baseline detector GS95 prompt photon cceX bbeX J/ Yuji Goto (RIKEN/RBRC)

  8. VTX upgrade Yuji Goto (RIKEN/RBRC)

  9. R = 2.5 cm pixel detector R = 5 cm R = 10 cm strip detector R = 14 cm VTX upgrade • Barrel silicon vertex tracker • jet axis measurement and isolation cut by charged particle detection with wider acceptance • displaced vertex measurement for heavy flavor tagging Yuji Goto (RIKEN/RBRC)

  10. VTX upgrade pixel strip Yuji Goto (RIKEN/RBRC)

  11. xG(x) silicon upgraded GS95 photon+jet cce(displaced)X ccDX BJ/X bbe/+displaced J/ Physics with VTX upgrade • Gluon polarization • photon + jet • charm and bottom tagging • Quark polarization flavor decomposition • W with improved isolation cut • Transversity • improved correlation study (near side and far side) • with wider acceptance Yuji Goto (RIKEN/RBRC)

  12. Physics with VTX upgrade Yuji Goto (RIKEN/RBRC)

  13. xG(x) silicon upgraded GS95 photon+jet cce(displaced)X ccDX BJ/X bbe/+displaced J/ Physics with VTX upgrade • Gluon polarization • photon + jet • jet axis measurement • charm and bottom tagging • with single electron measurement Yuji Goto (RIKEN/RBRC)

  14. No VTX With VTX xg(true) vs. xg(reconstruct) Physics with VTX upgrade • Gluon polarization • photon + jet • improved gluon’s x evaluation by kinematic reconstruction with jet axis • correlation study: “kT” issue in inclusive photon measurement Togawa’s talk in Spin2004 Yuji Goto (RIKEN/RBRC)

  15. Gluon polarization charm and bottom tagging with displaced vertex measurement charm D  single electron D   K J/  e+e- bottom B  single electron B  J/ single electron with displaced vertex measurement Physics with VTX upgrade DCA = Distance of Closest Approach (m) Yuji Goto (RIKEN/RBRC)

  16. Green : Charm Blue : Beauty Physics with VTX upgrade • Gluon polarization • single electron with displaced vertex measurement • Dalitz + conversion suppressed • ALLDalitz+Conversion to be known from ALL0 • bottom enhanced • ALLcharm and ALLbottom decomposed Togawa’s talk in Spin2004 no DCA cut with DCA cut Red : Dalitz+Convesion Green : Charm Blue : Beauty Yuji Goto (RIKEN/RBRC)

  17. VTX upgrade • Silicon strip detector • final test sensor design (Hamamatsu) + test hybrid module design (ORNL) with SVX4 readout chip (Fermilab) • to be built and tested early next year • final hybrid module will be packaged on the sensor … Yuji Goto (RIKEN/RBRC)

  18. VTX upgrade • Silicon pixel detector • ALICE hybrid • PHENIX sensor delivered in this month • electronics QA done • to be bump-bonded in a month or so Yuji Goto (RIKEN/RBRC)

  19. VTX upgrade • probe station and quality assurance test of pixel readout chips in a clean room laboratory at CERN Yuji Goto (RIKEN/RBRC)

  20. VTX upgrade • wire bonding facility in a clean room at RIKEN Yuji Goto (RIKEN/RBRC)

  21. VTX upgrade • Schedule • March 03 • approved by PHENIX+BNL management • endorsed by NSAC sub-committee for RHI • September 04 • proposal submitted to DOE • being reviewed … • partially funded by RIKEN • development and construction underway … • summer 06 • inner pixel layer + part of strip layers installed • summer 07 • full VTX detector completed • to be ready for RHIC 2007-2008 run Yuji Goto (RIKEN/RBRC)

  22. VTX upgrade • Collaboration • more than 70 people, 14 universities/institutes • BNL, Chemistry Department • BNL, Instrumentation Division • BNL, Physics Division • Florida State University • Iowa State University • KEK • Kyoto University • LANL • Niigata University • ORNL • RIKEN • RIKEN BNL Research Center • Stony Brook University • University of New Mexico • lots of more opportunity for new groups Yuji Goto (RIKEN/RBRC)

  23. Summary • Many measurements have been achieved and will be done with the PHENIX baseline system • gluon polarization • quark polarization flavor decomposition • transversity • PHENIX VTX will improve those measurements • with jet axis measurement: e.g. photon + jet • with displaced vertex measurement: e.g. single electron from charm and bottom • Completion in summer 2007 to be ready for RHIC 2007-2008 run • development and construction underway … • lots of more opportunity for new groups … Yuji Goto (RIKEN/RBRC)

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