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Dileptons and Photons at Collider Energies

Dileptons and Photons at Collider Energies. K. Dusling , C.H. Lee and I . Zahed. BNL14. Outline. Motivation Rates, Evolution Experiments. Na45: 95’. Phenix : 07’. Na60:03’. Star: 13’. Formally. acceptance. evolution. rate. time. Rates: Hadrons. Equilibrium averaging.

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Dileptons and Photons at Collider Energies

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  1. Dileptons and Photons at Collider Energies K. Dusling, C.H. Lee and I. Zahed. BNL14

  2. Outline • Motivation • Rates, • Evolution • Experiments

  3. Na45: 95’ Phenix: 07’ Na60:03’ Star: 13’

  4. Formally acceptance evolution rate time

  5. Rates: Hadrons

  6. Equilibrium averaging

  7. Hadronic Expansion

  8. Resonance Gas + … 1,2,3, …-Pi, 1,2,3-N + … In Diagrams

  9. Vector-Axial Mixing: κ κ Chiral Limit and zero-mtm pion:

  10. Data :  e+e-   Decay .

  11. VA-Mixing explicitly Dey, Eletsky, Ioffe 96

  12. Vector Spectral Function

  13. 2-pion Final state:

  14. Electric Conductivity:

  15. Hadronicvs Lattice:

  16. Flavour Susceptibility:

  17. in details:

  18. Flavour Susceptibility:

  19. Rates

  20. Rates: 1 Nucleon = + 1 Loop ChPT N- Transition

  21. Input at the Photon Point N background 

  22. a1a1 Typical Mixing in T=150 MeVμb=225 MeV

  23. Rates: sQGP

  24. sQGP: l+ l+ l- l- Hansson and Zahed 91’

  25. Electric Conductivity

  26. sQGP Rates

  27. Evolution

  28. Sample hydro evolution Faster cooling x higher rates: same

  29. V2 Flow @ 2.76 TeV

  30. Dileptons: NA60, Phenix, Star

  31. NA60 : dN/dη=140 95’

  32. Pt Spectra: low

  33. Pt Spectra: High

  34. PHENIX

  35. Beam Energy Scan: STAR 13’

  36. Photons: WA90, PHENIX

  37. WA98 0<qT (GeV) <4 0<qT (GeV)<0.8

  38. PHENIX RHIC1 RHIC2

  39. PHENIX extrapolation: γ PHENIX: M<<qv 1 15% Systematics!

  40. V2 PHENIX

  41. Achievements • EM “OK”* • LxR “restored” • QGP “visible” • V2 “low” (* π < < ρ)

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