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QGP’2000 at CERN

“Polarization studies as additional tool to search and study of the quark-gluon plasma” S.S. Shimanskiy (VBLHE, JINR). QGP’2000 at CERN.

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QGP’2000 at CERN

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  1. “Polarization studies as additional tool to search and study of the quark-gluon plasma”S.S. Shimanskiy (VBLHE, JINR) QGP’2000 at CERN A common assessment of the collected data leads us to conclude that we now have compelling evidence that a new state of matter has indeed been created, at energy densities which had never been reached over appreciable volumes in laboratory experiments before and which exceed by more than a factor 20 that of normal nuclear matter. The new state of matter found in heavy ion collisions at the SPS features many of the characteristics of the theoretically predicted quark-gluon plasma.

  2. QGP’2003 at BNL TJH RHIC PAC 9/29-30, 2003 TJH RHIC PAC 9/29-30, 2003 • Conclusions About Matter at RHIC: • The data on high pt suppression and correlations support the conclusion that we have produced a medium that: • - is dense; (pQCDtheory →many times cold nuclear matter density) • - is dissipative( very strongly interacting) • We need to show that: • - dissipation and collective behavior occur at the partonicstage • - the system is deconfinedand thermalized • - a transition occurs: can we turn the effects off ? • We need: • -extended AuAurun needed to address several important probes that need large data sets ( e.g., pT-dependence of suppression;J/ψ, ϒ, open charm, heavy baryon / meson flow); also, species andenergy scans to map the evolution of key observables • - more guidance from theory (!) particularly on what to expect from hadronicscenarios

  3. QGP + SPIN How we can use SPIN to find thermalization? the system isthermalized in the plasma rest frame there is no preferred direction, no polarization 

  4. Paul Hoyer, Physics Letters B,v.187 (1987)162Particle polarization as a signal of plasma formation “Heavy ion collisions leading to the formation of quark-gluon plasma are characterized by an isotropic distribution of the parton momenta in the plasma rest frame. We discuss the restrictions that this isotropy imposees on the polarizations of plasma-produced virtual photons, hyperons and hadronic resonances. “

  5. Dileptons as an unique probes for QGP • Haven’t strong interaction. • Come out from all evolution stages.

  6. CERES/NA45 data

  7. Dileptons Anisotropies. How we can resolve sub processes using its?

  8. NN-reactions TRANSPARENCES

  9. e+e- anisotropy (theory) E.L. Bratkovskaya, O.V. Teryaev, V.D. Toneev from JINR Phys. Lett. B 348 (1995) 283. E.L. Bratkovskaya, O.V. Teryaev, V.D. Toneev + W. Cassing, U. Mosel, M. Schafer from Giessen Phys. Lett. B 348 (1995) 325. W. Cassing, E.L. Bratkovskaya Physics Reports 308 (1999) 65-233.

  10. Bratkovskaya E.L. et al., Z. Phys. C 75, 119.126 (1997) GSI and more energies

  11. Bratkovskaya E.L. et al., Z. Phys. C 75, 119.126 (1997) SPS energy

  12. Rapp R., hep-ph/0201101 SPS energy II

  13. The STAR Barrel TOF MRPC Prototype Prototype Tray Construction at Rice University MRPC design developed at CERN, built in China 28 MRPC Detectors; 24 made at USTC FEE Neighbor CTB Tray EMC Rails   70 ps, 2 meter path Strong team including 6 Chinese Institutions in place Completed Prototype 28 module MRPC TOF Tray installed in STAR Oct. ‘ 02 in place of existing central trigger barrel tray

  14. Examples of Benefit of TOF Open Charm and Resonances in central Au-Au collisions FOM (figure of merit) = reduction in required data set by using TOF PID TOF PID also reduces systematic errors from correlated back-ground due to misidentified particles Certain measurements are impossible without TOF – unlike particle correlations (X-p), scale dependent correlation studies (velocity vs momentum correlations), exotic searches…

  15. TOF + TPC electron Tag • Works well at low energy – complements calorimeter • Gives access to vector meson (,,,J/) e+e- decays • Thermal dileptons • Single electron spectrum • D meson yield, flow

  16. Rapp R., hep-ph/0201101 RHIC energy

  17. Ioffe B.L., hep-ph/0310343 Dubna, SPIN 2003 J/ polarization

  18. What will be interesting for investigations ?(Will need to compare pp and AA data, energy and impact parameter dependences)

  19. Thank you!

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