PHENIX Charge to the commitee The P-25 PHENIX team wishes to formally join the Silicon Upgrade Project, whose purpose is to allow detached-vertex determination in collisions that will result in the identification of open charm. P-25 group management and nuclear-physics program management requests the review committee to evaluate the following issues: 1) The resource level, both staff and financial, required to carry out the proposed commitment in each of the fiscal years from FY'04-FY'08. 2) The most likely technical challenges to be faced by the team, either mechanically or electronically, and the associated risk to the program. 3) The quality of the physics opportunities opened by the upgrade. 4) The impact on the team's ability to carry on D M Lee 6-17-2003
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PHENIX Charge to the commitee The P-25 PHENIX team wishes to formally join the Silicon Upgrade Project, whose purpose is to allow detached-vertex determination.
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PHENIXCharge to the commitee
The P-25 PHENIX team wishes to formally join the Silicon UpgradeProject, whose purpose is to allow detached-vertex determination incollisions that will result in the identification of open charm.
P-25 group management and nuclear-physics program managementrequests the review committee to evaluate the following issues:1) The resource level, both staff and financial, required to carry outthe proposed commitment in each of the fiscal years from FY'04-FY'08.2) The most likely technical challenges to be faced by the team, eithermechanically or electronically, and the associated risk to the program.3) The quality of the physics opportunities opened by the upgrade.4) The impact on the team's ability to carry on world class researchusing the muon arms and the MVD during the construction period of theupgrade. Thank you for agreeing to help us evaluate this exciting newdirection at RHIC.
D M Lee 6-17-2003
PHENIXD M Lee 6-17-2003
CDR Muon Physics Program
PHENIX
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Muon Spin Physics Program
Quark Polarization / Flavor Decomposition via Parity Violating W+ -> μ+ or μ + X
Gluon Polarization via J/ -> μ+ μ or D or B -> μ+ or μ + X
TransversityProgram requires high luminosity, good polarization, 500 GeV, and
identification of heavy quark decays!
Polarized p-p collisions at 200, 500 GeV
PHENIXD M Lee 6-17-2003
Physics Program - Vector Meson suppression
PHENIXsimulated +- mass spectrum
NA50 -- Anomalous J/ suppression. Evidence for QGP??
But J/’s are also suppressed by non-QGP effects such as absorption, shadowing, etc; as seen in the results from our E866/NuSea measurements at Fermilab.
A signature of Quark-gluon plasma (QGP) is the suppression of J/ production. The formation of J/’s in a QGP is predicted to be inhibited by color-screening.
A = pA
PHENIX
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Parton structure, modification in nuclei, spin-dependence and the Quark Gluon Plasma(QGP):
• Flavor asymmetry of the nucleon sea and its spin-dependence; origins from meson-cloud of the nucleon
• Gluon structure functions, their shadowing in nuclei and spin-dependence
• Energy loss & fragmentation of partons (light & heavy) in nuclei to elucidate the parton dynamics of these processes. Contrast with same in hot/high-density matter.
• Heavy-quark (open and closed-c,b) production and suppression in cold nuclei & in QGP.
• Characteristics of heavy-ion collisions through charged particle multiplicities, reaction plane measurements, etc.
RHIC is first dedicated heavy ion collider10 times the energy previously available!
PHENIX
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South Muon Arm - 2001
North Muon Arm - 2002
MVD 2002
FCAL 2002
PHENIXD M Lee 6-17-2003
South Muon Arm North Muon Arm
It only took 9 years
PHENIXD M Lee 6-17-2003
230 cm
330 cm
Station 2 Station 3
PHENIXD M Lee 6-17-2003
South- FEE
Station-3
Chassis
CROC board
PHENIXD M Lee 6-17-2003
PHENIXMVD half cylinder before run 3
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PHENIXfuture goals
•Continue to provide leadership in the analysis of muon arms data
•Concentrate on J/psi, hi-pt, spin (original goals), requires high L
•Prepare for the upcoming AuAu run ( run 4)
•Prepare for the upcoming pp spin run (run 5)
•Continue to provide leadership in the silicon vertex endcaps
•Develop physics capabilities of silicon/muon match
•Routine maintenance
Silicon Tracker Upgrade
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PHENIXWhat the PHENIX team wants from this committee
•Recognize the first rate nature of the physics program, current and new physics with the silicon upgrade
•Acknowledge the contributions made by the PHENIX group
•Agree that current physics and future upgrades for new physics reach are necessary for a viable group
•Recommend that the PHENIX team should proceed with its long range goals and that the silsion tracker upgrade should proceed with LANL playing a major role.
PHENIXD M Lee 6-17-2003
I will show 3 slides from Barbara Jacak’s talk at the Intersersections Meeting in May 2003.
0 RAA vs. predictions
PHENIX Preliminary
shadowing
anti-shadowing
Theoretical predictions:
d+Au: I. Vitev, nucl-th/0302002 and private communication.
Au+Au: I. Vitev and M. Gyulassy, hep-ph/0208108, to appear in Nucl. Phys. A; M. Gyulassy, P. Levai and I. Vitev, Nucl. Phys. B 594, p. 371 (2001).
Initial state: mult. scatt.,shadowing + final state dE/dx (Au+Au)
Also: Kopeliovich, et al (PRL88, 232303,2002)
predict RpA~1.1 max at pT=2.5 GeV projectile as color dipole
PHENIX preliminary
conclusions• Rapid equilibration!
– Strong pressure gradients, hydrodynamics works
• EOS is not hadronic
• The hot matter is “sticky” – it absorbs energy
– See energy loss, disappearance of back-to-back jets
– d+Au data says: final state, not initial state effect
• So, the stuff is dense, hot, and ~ equilibrated
– Is it quark gluon plasma? Sure looks like it to me…
• OK, then where’s the New York Times?
– J/Y suppression or not? Next run
– Tinitial? direct photon analysis underway by PHENIX