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PHENIX in the next decade

E.Kistenev, BNL. PHENIX in the next decade. Erice, September 17, 2012. Slides contributed by J.Nagle, W.Zajc, D.Morrison, D.Karzeev, V.Pantuev. 2002: discovery of high p T suppression at RHIC.

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PHENIX in the next decade

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  1. E.Kistenev, BNL PHENIX in the next decade Erice, September 17, 2012 Slides contributed by J.Nagle, W.Zajc, D.Morrison, D.Karzeev, V.Pantuev

  2. 2002: discovery of high pT suppression at RHIC • Suppression of hadrons with large transverse momentum in central Au+Au collisions at √sNN = 130 GeV, PHENIX Collaboration (K. Adcox et al.), Phys.Rev.Lett.88:022301,2002 • 664 citations D.Karzeev, 2004 RHIC II and dedicated program at RHICII are necessary to extend our understanding of collective QCD phenomena discovered at RHIC

  3. Since 2002 the goal was to confirm that the observed high pT suppression is indeed due to the parton energy loss in the media: Search for fluctuations –> transport coefficients; Energy scan -> search for critical point; Studies of the suppression dependence on the quark mass; Studies of the suppression dependence on collision energy (RHIC vs LHC); CMS, PbPb, Isolated photons, 2.76 TeV

  4. Systematic investigation of variations with s 2.76 TeV at LHC very similar to 200 GeV at RHIC!

  5. The Intellectual Challenges and Rewards • Challenge: Solving a multi-scale, highly dynamic transport problem in an intrinsically quantum system. • Rewards: • Possible resolution of quasiparticles • Measurement of shear viscosity to entropy ratio h/s • Measurement of transport coefficients • in a fundamental gauge theory W.Zajk, Tribble com. talk

  6. Mapping Out Media Coupling with Jet Probes In a weakly coupled turbulent plasma Key is independently measuring both sides of this equation! Scenario #1 (x10) reveals peak in q ! QCD Weak Case ^ RHIC Perfect Fluid • A. Majumder, B. Muller, X.N. Wang, PRL (2007). • “Small Shear Viscosity Implies Strong Jet Quenching” • Liao and Shuryak, PRL (2009) • “Jet Quenching is a few times stronger near Tc relative to the QGP at T > Tc.”

  7. Indirect “bounding” h/s at RHIC • Range of estimates: • (Compilation by A. Tang,R.J. Lacey) • Estimated “error band” PHENIX, PRL (2010) “Large v2 is striking in that it exceeds expectations of pQCD models even at 10 GeV/c” J.LiaoarXiv:1209.1052v1 [nucl-th] 5 Sep 2012 “AdS/CFT-motivated model with cubic path-length which enhances the late time quenching that mimics the near-Tc enhancementdescribes v2 at high pt for RHIC”

  8. Jet/photon tagging for q measurements Jet or photon

  9. Fractional momentum loss RHIC and LHC give a key lever arm in temperature dpT/pT LHC RHIC RAA pT Analogy: e - energy loss in electrical field arXiv:1208.2254 • Horowitz and Gyulassy, NPA (2011) • “The surprisingly transparent sQGP at the LHC [compared to RHIC]” Measure fractional momentum loss (dpT/pT) instead of RAA Different dpT/pT for same RAA

  10. Can RHIC precisely measure key observables Rates are huge. They will allow differential measurements with varying collision geometry (v2, v3, A+B, U+U, …) &precision control measurements (d+Au and p+p) !! Based on full stochastic cooling, no additional accelerator upgrades

  11. Further Leveling the playing field with LHC Use advantages of RHIC (machine is dedicated to HI physics); Vary the species (shape, isotopic content); Study threshold behavior varying collision energy; Do better measurements LHC comparable or increased coverage; comparable or better resolution; better hermeticity, uniformity

  12. sPHENIX Decadal Plan ambitious upgrade to study the sQGP with a new compact, hermetic, large acceptance and high rate calorimetry based detector High statistics Upsilons , large Dijet and g-jet rates with full calorimetry, photon/charm/beauty tagging of jets with PreShower/VTX, low-x jet, g, quarkonia, transverse spin probes, staged into ePHENIX detector.

  13. Specs for NEW sPHENIX Central Detector

  14. sPHENIX MIE Project (major item of equipment) • Magnet • Solenoid 2 Tesla, Rinner = 70 cm • Accordion Tungsten-Fiber EMCal • Fe-Scintillator HCal • Also acts as flux return for magnetic field

  15. Full HIJING Event Analysis truth jets reconstructed jets 18GeV 16GeV 6GeV 19GeV Jet Transverse Energy (GeV) Very good jet finding efficiency even in the most central Au+Au events for ET > 20 GeV 15GeV 25-30 GeV reconstructed Jets are dominated by real jets (known from HIJING truth)

  16. sPHENIX Electromagnetic Calorimeter

  17. sPHENIX Hadron Calorimeter ~ 75%/√E Response Tilt tuneup (mip’s)

  18. First look on HC performance

  19. Summary • Heavy Ion Collisions produced major discoveries in “Physics in Collisions” in the last 10 years, jet quenching and unexpectedly strong elliptic flow are two examples. • In the era of LHC RHIC still offers unique opportunities for detailed studies of matter phase transition on a phase boundary close to critical temperature. We need the lever arm of RHIC and LHC together to find a fundamental explanation for how the perfect fluid emerges at strong coupling near Tc • from an asymptotically free theory of quarks and gluons. • Calorimetry based upgrade to PHENIX will create a tool to explore this opportunity with jets and direct photons being event observables and event tags of choice.

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