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S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 1
1. New questions and needs2. sPHENIX concept and acceptance3. soft physics and thermal photons4. critical point and fluctuation5. jets and hard probes6. detector R&D, schedule and plan
sPHENIX upgrade for a next US-J projectShinIchi Esumi, Univ. of Tsukubafor the PHENIX/US-J collaboration
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
hydroexpansion
quarkcoalescence
energyloss
thermal photon (low pT) surprisingly large v2prompt photons (high pT) reasonably small
v2 of hadrons
v2 of direct photons
Collective expansion and freeze-out
v2
photons
hadrons
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 6
PRL107, 252301, (2011)
PHENIXInitial density distribution
Initial fluctuation followed by collective expansion
WMAP
central peripheral
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 7
higher moments of p-pbar distribution
Fluctuations close to the Critical Point
S. Gupta, QM2011
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 8
0 (hadron) trig.Jet (s
mall R) tr
ig.Jet (large R) tr
ig.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, KEK 9
rare probe scan 50 < √sNN < 200 GeV asymmetric systems Au+Au , Cu+Au , U+Uasymmetric energies
Energy dependence is a key tool for understanding
RHIC provides a sweet spotLattice calc.
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 10
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, KEK 11
• 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
jet-reconstruction study Jets in medium
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 12
fast MRPC for Jet chemistry and wide coverage PID
TOF vs 1/p (with Aerogel Cherenkov veto)
KpPID with current system
Jet chemistryparticle composition within a jet conewide coverage PID for e-by-e study
MRPC TOF
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 13
* 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
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, KEK 14
Plans
Jets in medium
Direct photon flow
Jet chemistry
e+e-, J/psi
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 15
EMCAL 7.5 MHCAL 3.9 MMagnet 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
Cost estimate for Strawman: initial implementation
MagnetEMCAL
HCAL
VTX
(w/o pre-shower)
(existing)
Magnet: * Existing
CLEO II: R=1.55 m, L=3.8 m, B=1.5TCDF: R=1.5 m, L = 5.07 m, B=1.5TD0: R= 0.6 m, L= 2.73 m, B= 2T
* NewR= 1.0 m (this estimation)R= 0.6 m (Decadal Plan)
Tungsten + Scintillator EMCAL ||<1, 2x = 0.024 x 0.024)
Fe + Scintillator HCAL ||<1, 2x = 0.1 x 0.1)
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 16
Summary
New questions and needssPHENIX conceptQGP physics at RHICdetector R&D, schedule and plan
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 17
Thermalization mechanismdir yield, spectra & flow
Coupling scale & quasiparticle searchcharm hard (not thermal) probec vs. b in QGP
Critical point & energy scanNon-monotonic behavior
parton-plasma interactionJets ≤ 50 GeV, -jetEjet, l, qmass, jet dep. of dE/dxJet virtuality ~ medium scale
Screening lengthstudy as function of √s, pT
QCD in cold, dense (initial) statey dependence in d+Au Gluon saturation scale, EIC
Backup --- answers to the earlier questions
S. Esumi, sPHNIX for US-J, 21/Dec/2011, KEK 18
p+p (fit to ATLAS data)Pb+Pb E1 > 100 GeVdash includes E2 > 25 GeVqhat = 30 GeV/fm2
p+p (fit to PYTHIA)Pb+Pb E1 > 30 GeVdash includes E2 > 5 GeVqhat = 10 GeV/fm2
J. Nagle
B. Mueller