S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK1 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 sPHENIX upgrade for a next US-J project ShinIchi Esumi, Univ. of Tsukuba for the PHENIX/US-J collaboration

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK2 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, KEK3 current PHENIXfuture sPHENIX

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK4

5 hydro expansion quark coalescence energy loss thermal photon (low p T ) surprisingly large v2 prompt photons (high p T ) reasonably small v 2 of hadrons v 2 of direct photons Collective expansion and freeze-out v2v2 photons hadrons

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK6 PRL107, , (2011) PHENIX Initial density distribution Initial fluctuation followed by collective expansion WMAP central peripheral

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK7 higher moments of p-pbar distribution Fluctuations close to the Critical Point S. Gupta, QM2011

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK8  0 (hadron) trig. Jet (small R) trig. Jet (large R) trig. Gamma trig. Closer and closer to the initial parton energy more and more surface bias given by energy loss Jet quenching with reconstructed jets

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK9 rare probe scan 50 < √s NN < 200 GeV asymmetric systems Au+Au, Cu+Au, U+U asymmetric energies Energy dependence is a key tool for understanding RHIC provides a sweet spot Lattice calc.

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK10 Charged hadrons, photons and electrons tracking under high-multiplicity Direct photon flow e+e-, J/psi Si + cylindrical GEM

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK11 Capable with inclusive jets of E T =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 jet-reconstruction study Jets in medium

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK12 fast MRPC for Jet chemistry and wide coverage PID TOF vs 1/p (with Aerogel Cherenkov veto)  K p PID with current system Jet chemistry particle composition within a jet cone wide coverage PID for e-by-e study MRPC TOF

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK13 * 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 VTX EMC options Y. Arai, KEK, yesterday afternoon R&D session III Existing detectors and R&D’s

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK14 Plans

Jets in medium Direct photon flow Jet chemistry e+e-, J/psi S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK15 EMCAL7.5 M HCAL3.9 M Magnet3.5 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) % of total 20M$ US-J investment would be $3~4M$  48~64 MY/year for 5 years Cost estimate for Strawman: initial implementation Magnet EMCAL HCAL VTX (w/o pre-shower) (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) Tungsten + Scintillator EMCAL |  |<1, 2   x  = x 0.024) Fe + Scintillator HCAL |  |<1, 2   x  = 0.1 x 0.1)

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK16 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, KEK17 Thermalization mechanism  dir 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,  -jet E jet, l, q mass,  jet dep. of dE/dx Jet virtuality ~ medium scale Screening length study as function of √s, p T QCD in cold, dense (initial) state y dependence in d+Au Gluon saturation scale, EIC Backup --- answers to the earlier questions

S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK18 p+p (fit to ATLAS data) Pb+Pb E1 > 100 GeV dash includes E2 > 25 GeV qhat = 30 GeV/fm 2 p+p (fit to PYTHIA) Pb+Pb E1 > 30 GeV dash includes E2 > 5 GeV qhat = 10 GeV/fm 2 J. Nagle B. Mueller