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Collider Energies Dileptons and Photons

Study of rates, evolution, and experiments on dileptons and photons at high collider energies, highlighting resonance gases, chiral reduction, and electric conductivity rates. Observations from NA60, PHENIX, and STAR experiments.

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Collider Energies Dileptons and Photons

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  1. Dileptons and Photons at Collider Energies K. Dusling, C.H. Lee and I. Zahed. QM14

  2. Outline • Set up • Rates, • Evolution • Experiments

  3. Formally acceptance evolution rate time

  4. Rates: Hadrons

  5. Equilibrium averaging l+ l+ l- l-

  6. Resonance Gas + … 1,2,3, …-Pi, 1,2,3-N + … Chiral Reduction

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

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

  9. Rates

  10. Electric Conductivity:

  11. Flavour Susceptibility:

  12. Rates: sQGP

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

  14. sQGP Rates

  15. Evolution

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

  17. V2 Flow @ 2.76 TeV

  18. Dileptons: NA60, Phenix, Star

  19. NA60 : dN/dη=140 95’

  20. PHENIX: 07’ Only!

  21. Beam Energy Scan: STAR 13’

  22. Photons: WA90, PHENIX

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

  24. PHENIX RHIC1 RHIC2

  25. V2 PHENIX

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

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

  28. Vector Spectral Function

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

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