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Dileptons and Photons

Dileptons and Photons . K. Dusling and I . Z. BNL 09. Outline. Motivation Rates Evolution Experiments. NA45: 95. NA60: 03 . Phenix: 07 . Rate: Formally . Acceptance: NA60 vs PHENIX. Hadronic Rates. Dilepton Production. l +. l +. l -. l -. Resonance Gas: J= ρ+ρ ’+.

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Dileptons and Photons

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  1. Dileptons and Photons K. Duslingand I. Z. BNL 09

  2. Outline • Motivation • Rates • Evolution • Experiments

  3. NA45: 95

  4. NA60: 03

  5. Phenix: 07

  6. Rate: Formally

  7. Acceptance: NA60 vs PHENIX

  8. HadronicRates

  9. Dilepton Production l+ l+ l- l-

  10. Resonance Gas: J=ρ+ρ’+.. +2+3, …-Pi, +2+3, …-K +2+3, …-N Expand in Stable Hadrons

  11. + … + … Many Feyman Graphs: + … +

  12. How to reduce

  13. Asymptotics: Broken CS

  14. In Practice: NF=2 Chiral Limit and zero-mtm pion:

  15. VA Mixing=LxR Restoration? Dey, Eletsky, Ioffe 96

  16. Expansion Parameter:  = 0 Dilute!

  17. 2-pion Final state:

  18. 2-pion Final state:

  19. ΠV and ΠA

  20. Data :  e+e-   Decay .

  21. 1 Nucleon Final State = + 1 Loop ChPT N- Transition

  22. Input at the Photon Point N background 

  23. VA Mixing in T=180 MeV

  24. a1a1 VA Mixing in T=150 MeVμb=225 MeV

  25. QGP Rates

  26. wQGP: l+ l+ l- l-

  27. wQGP: LPM Effect: Aurenche et al 02

  28. wQGP: γ Collinear Enhancement+ LPM Effect : Arnold, Moore, Yaffe 01

  29. sQGP: OPE Hansson and Zahed 91

  30. Hydro Evolution

  31. Hydro Parameters SPS, RHIC and LHC

  32. Fireball: NA60

  33. Thermal Freeze-out Cooper-Frye

  34. Chemical Freezeout: Fireball cools faster x Rates higher = w/μπ !

  35. NA60

  36. NA60 : dN/dη=140

  37. Pt Spectra: Intermediate

  38. NA60 dimuons : Upshots • Hadronic emission dominant: VA mixing • Partonic emission small: tiny QGP • Blue shifted spectra (M=rho): small Lh?

  39. Phenix: Dileptons

  40. pT spectra: Wπ+Wππ

  41. MIGHTY FILTER!

  42. PHENIX Dusling+Z 07 Dusling+Z 09

  43. PHENIX DI-electrons : Upshots • Hadronic large but Filtered: M<500 MeV • Partonic large and dominant: 100<M<250 !! • Hadronic large and dominant: M=ρ-ω-φ • Non-thermal emission: 300<M<500 MeV. Another DLS-like puzzle?

  44. Phenix: Photons

  45. Versus Kinetic Turbide, Rapp, Gale 04; Liu, Rapp 07

  46. WA98 0<qT (GeV) <4 0<qT (GeV)<0.8 N:x2

  47. Rates at RHIC RHIC1 RHIC2

  48. PHENIX RHIC1 RHIC2

  49. PHENIX extrapolation

  50. Systematics of the Extrapolation 15% Systematics!

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