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Workshop on Quark-gluon Thermalization Vienna, August 10-12, 2005

Workshop on Quark-gluon Thermalization Vienna, August 10-12, 2005. Thermalization and Globally Polarized QGP in Non-central Heavy-ion Collisions. Instability and Cerenkov Radiation. Xin-Nian Wang/LBNL. In collaboration with Zuo-tang Liang. Phys. Rev. Lett. 94 (2005)102301.

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Workshop on Quark-gluon Thermalization Vienna, August 10-12, 2005

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  1. Workshop on Quark-gluon Thermalization Vienna, August 10-12, 2005 Thermalization and Globally Polarized QGP in Non-central Heavy-ion Collisions Instability and Cerenkov Radiation Xin-Nian Wang/LBNL In collaboration with Zuo-tang Liang Phys. Rev. Lett. 94 (2005)102301

  2. Direct Signs for Thermalization Leading hadrons Medium Fuqiang Wang <pT> from away jets <pT> from medium decay

  3. Global Orbital Angular Momentum y y Rotation and deformed nuclei z z x x Low-energy nuclear collisions: Stiff EOS P~ DE

  4. Global Orbital Angular Momentum A y y p z z x x h -4 -2 0 2 4 High-energy Nuclear Collisions

  5. Nuclei Are Spherical ! 3D distribution of multiplicity and Momentum Heinz & Kolb’04 Adil & Gyulassy’5

  6. Transverse Gradient of Shear Velocity x z b Collective longitudinal momentum per produced parton Distribution of number of participant projectile or target nucleons

  7. Local Orbital Angular Momentum (x-b/2)/RA Dx

  8. Quark Scattering with fixed Ly n p pf xT Screened static potential model:

  9. Quark Polarization n p pf xT Polarized cross section: Semi-central: b=RA Unpolarized cross section:

  10. Spin-orbital coupling n p pf xT A New Picture of A+A

  11. Consequences Directed flow? f Single-spin asymmetry: Enhanced r/p, D/p ratio Polarized thermal dilepton, J/Y Hyperons and vector mesons

  12. Constituent Quark Recombination Constituent quark model: (l=0, color anti-symmetric) Polarization of valence quarks + relative orbital angular momentum Polarization of constituent quarks

  13. Features of Global Hyperon Polarization • Hyperons & anti-hyperons are similarly polarized • PH=0 in central and increases with b • Pq 0 for pT>> Dp0z, PH finite for moderate pT due to hard-soft recombination • Contribution from directed flow at large y

  14. Other effects Hadronic scattering: L+p L p PL<0 PL>0

  15. Thoughts for the Brave… v2 in p+A collisions? N1 N2 N2> N1

  16. Summary • Shear velocity gradient leads to global polarization if there is interaction across transverse direction due to thermalization • A new picture of QGP structure in heavy-ion collisions: • Hyperon polarization, vector meson spin alignment, contribution to v2 • Future work: • Quantitative evaluation of hadronic interaction • Spin transport: spintronics of strong interaction

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