LANL - M. Leitch 1

New J/ suppression from 2008 d+Au datacompared to theory(Colorado, LANL, FSU)

J/ψ impact parameter dependence of suppression not linear with nuclear thickness(Colorado, LANL, FSU)

Recent Cold Nuclear Matter results from d+Au collisions

, and suppression for forward-rapidityd+Au (L. Guo – LANL)

Isolating & quantifying gluon saturation & CNM dE/dx

STAR (prelim)

Upsilon suppression in 2008 d+Au data(Korea U., LANL)

arXiv:1010.1246

arXiv:1010.1246

2/13/2011

LANL - M. Leitch 2

Plot by Leitch @ Seattle/INT Workshop – June 09

J/ψ

energy density

J/ψ Suppression in Au+Au Collisions

New Au+Au J/ suppression from 2007 compared to various theories(Colorado, LANL)

Recent attempt to extrapolate and divide out d+Au cold nuclear matter effects & show “anamolus” suppression in A+A from various experiments(Leitch)

versus centralityversus pT

PHENIX Internal

PHENIX Internal

2/13/2011

LANL - M. Leitch 3

Fixing cross-talk problems by terminating anodes in Muon Tracker – Important especially for W measurements in muon arms(LANL, RIKEN, Korea U.)

Manlift work on station-1 to put termination on

New capacitors that connect anodes to terminators

Terminators designed and installed in tight spaces

2/13/2011

LANL - M. Leitch 4

• replace central arms with solonoid magnet & compact EMCal & HCal• replace South muon arm with very-forward electron-capable spectrometer

(2016-2018)

Leitch (d+Au), Aidala (spin), van Hecke

2/13/2011

LANL - M. Leitch 52/13/2011

• Are quarks strongly coupled to the quark-gluon plasma at all interaction distance scales?• What are the detailed mechanisms for parton-QGP interactions and responses? Are the interactions coherent over the entire medium length scale, what are the dominant energy loss mechanisms?• Are there quasi-particles in the medium? What is their mass and width?• Is there a relevant color screening length in the quark-gluon plasma?• How is rapid equilibration and entropy production achieved?• What is the nature of color charge in large nuclei? What role does gluon saturation and the EMC effect play in nucleus-nucleus collisions? How do these modifications evolve?

• Dynamical Origins of Spin-Dependent Interactions• New Probes of Longitudinal Spin Effects• Measurements with Polarized He3 and Increased Energies

QGP and CNM Physics Spin Physics

EIC Physics• Inclusive e+p physics to measure polarized and unpolarized structure function and advance knowledge of quark and gluon contributions to proton spin.• Nuclear parton distribution fucntions (nPDFs), relevant to study of gluon saturation effecs.• Elastic diffractive physics to provide tomography of the nucleon and to help define the initial state for heavy-ion collisions

Physics of the PHENIX Decadal Plan