1. New questions and needs 2. sPHENIX concept and acceptance 3. soft physics and thermal photons

1. sPHENIX upgrade for a next US-J project ShinIchi Esumi, Univ. of Tsukuba for the PHENIX/US-J collaboration 1. New questions and needs 2. sPHENIX concept and acceptance 3. soft physics and thermal photons 4. critical point and fluctuation 5. jets and hard probes 6. detector R&D, schedule and plan S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

2. New questions from RHIC & LHC data! • How is thermalization achieved so rapidly? • Are there quasiparticles in the quark gluon plasma? If so, when and what are they? • What is the mechanism for quark/gluon-plasma interactions? Plasma response? • Nature of QCD matter at low T but high ? • At what scales is the coupling strong? • Is there a relevant (color) screening length? • Are there novel symmetry properties? To answer these questions S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

3. current PHENIX future sPHENIX S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

4. S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

5. Collective expansion and freeze-out photons hadrons v2 v2 of hadrons thermal photon (low pT) surprisingly large v2 prompt photons (high pT) reasonably small energy loss quark coalescence v2 of direct photons hydro expansion S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

6. Initial fluctuation followed by collective expansion WMAP peripheral central Initial density distribution PHENIX PRL107, 252301, (2011) S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

7. Fluctuations close to the Critical Point higher moments of p-pbar distribution S. Gupta, QM2011 S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

8. Jet quenching with reconstructed jets Closer and closer to the initial parton energy Gamma trig. Jet (large R) trig. Jet (small R) trig. 0(hadron) trig. more and more surface bias given by energy loss S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

9. Energy dependence is a key tool for understanding RHIC provides a sweet spot Lattice calc. rare probe scan 50 < √sNN < 200 GeV asymmetric systems Au+Au , Cu+Au , U+U asymmetric energies S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

10. Direct photon flow Charged hadrons, photons and electrons e+e-, J/psi Si + cylindrical GEM tracking under high-multiplicity S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

11. Jets in medium jet-reconstruction study • Capable with inclusive jets of ET=20~65 GeV and R=0.2~0.3 in central Au-Au • Lower energy and/or larger R jets for non-central Au-Au and light ions S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

12. Jet chemistry particle composition within a jet cone wide coverage PID for e-by-e study fast MRPC for Jet chemistry and wide coverage PID PID with current system p TOF vs 1/p (with Aerogel Cherenkov veto) K  MRPC TOF S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

13. Existing detectors and R&D’s VTX EMC options VTX * possible new technologies from yesterday afternoon R&D session ! (advanced pixel sensor, TPC, PID,,,) * re-use the CDF (or other old) solenoid or a new magnet construction Y. Arai, KEK, yesterday afternoon R&D session III S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

14. Plans S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

15. Cost estimate for Strawman: initial implementation Tungsten + Scintillator EMCAL |h|<1, 2p (Dh x Df = 0.024 x 0.024) HCAL Magnet EMCAL Fe + Scintillator HCAL |h|<1, 2p (Dh x Df = 0.1 x 0.1) (w/o pre-shower) VTX EMCAL 7.5 M HCAL 3.9 M Magnet 3.5 M  US-J ?! ------------------------------------------------------------------------------------------------------------------ + Si-W pre-shower ~4.5 M US-J or MEXT ? or PID (cost estim. underway) or tracking (cost estim. underway) ------------------------------------------------------------------------------------------------------------------ DOE to provide initial 20.0 M$ (including overhead + contingency) ------------------------------------------------------------------------------------------------------------------ 15-20% of total 20M$ US-J investment would be $3~4M$  48~64 MY/year for 5 years Jets in medium (existing) • Magnet: • * Existing • CLEO II: R=1.55 m, L=3.8 m, B=1.5T • CDF: R=1.5 m, L = 5.07 m, B=1.5T • D0: R= 0.6 m, L= 2.73 m, B= 2T • * New • R= 1.0 m (this estimation) • R= 0.6 m (Decadal Plan) Direct photon flow Jet chemistry e+e-, J/psi S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

16. Summary New questions and needs sPHENIX concept QGP physics at RHIC detector R&D, schedule and plan S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

17. Backup --- answers to the earlier questions • Thermalization mechanism • gdir yield, spectra & flow • Coupling scale & quasiparticle search • charm hard (not thermal) probe • c vs. b in QGP • Critical point & energy scan • Non-monotonic behavior • parton-plasma interaction • Jets ≤ 50 GeV, g-jet • Ejet, l, qmass, Fjet dep. of dE/dx • Jet virtuality ~ medium scale • Screening length • study as function of √s, pT • QCD in cold, dense (initial) state • y dependence in d+Au • Gluon saturation scale, EIC S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK

18. J. Nagle p+p (fit to ATLAS data) Pb+Pb E1 > 100 GeV dash includes E2 > 25 GeV qhat = 30 GeV/fm2 B. Mueller p+p (fit to PYTHIA) Pb+Pb E1 > 30 GeV dash includes E2 > 5 GeV qhat = 10 GeV/fm2 S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK