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

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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

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PRL107, 252301, (2011)

PHENIXInitial density distribution

Initial fluctuation followed by collective expansion

WMAP

central peripheral

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higher moments of p-pbar distribution

Fluctuations close to the Critical Point

S. Gupta, QM2011

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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

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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.

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Charged hadrons, photons and electrons

tracking under high-multiplicity

Direct photon flow

e+e-, J/psi

Si + cylindrical GEM

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• 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

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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

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* 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

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Plans

Jets in medium

Direct photon flow

Jet chemistry

e+e-, J/psi

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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)

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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

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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