Dileptons and Photons K. Dusling and I. Z. BNL 09.

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Presentation transcript:

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-

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

Many Feyman Graphs: + + …

How to reduce

Asymptotics: Broken CS

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

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

Expansion Parameter:  = 0 Dilute!

2-pion Final state:

ΠV and ΠA

Data :  e+e-   Decay.

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

Input at the Photon Point   N background

VA Mixing in T=180 MeV

VA Mixing in a 1 a 1 T=150 MeV μb=225 MeV

QGP Rates

wQGP: l+ l-l- l-

wQGP: LPM Effect: Aurenche et al 02

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

sQGP: OPE Hansson and Zahed 91

Hydro Evolution

Hydro Parameters SPS, RHIC and LHC

Fireball: NA60

Thermal Freeze-out Cooper-Frye

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

NA60

NA60 : dN/dη=140

Pt Spectra: Intermediate

NA60 dimuons : Upshots 1.Hadronic emission dominant: VA mixing 2.Partonic emission small: tiny QGP 3.Blue shifted spectra (M=rho): small Lh? 1.Hadronic emission dominant: VA mixing 2.Partonic emission small: tiny QGP 3.Blue shifted spectra (M=rho): small Lh?

Phenix: Dileptons

pT spectra: Wπ+Wππ

MIGHTY FILTER!

PHENIX Dusling+Z 07 Dusling+Z 09

PHENIX DI-electrons : Upshots 1.Hadronic large but Filtered: M<500 MeV 2.Partonic large and dominant: 100<M<250 !! 3.Hadronic large and dominant: M=ρ-ω-φ 4.Non-thermal emission: 300<M<500 MeV. Another DLS-like puzzle? 1.Hadronic large but Filtered: M<500 MeV 2.Partonic large and dominant: 100<M<250 !! 3.Hadronic large and dominant: M=ρ-ω-φ 4.Non-thermal emission: 300<M<500 MeV. Another DLS-like puzzle?

Phenix: Photons

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

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

Rates at RHIC RHIC1 RHIC2

PHENIX RHIC1 RHIC2

PHENIX extrapolation

Systematics of the Extrapolation 15% Systematics!

LHC: √s=5.5 TeV 0<qT(GeV)<2 1<qT (GeV)<5

WA98 and PHENIX Photons : Upshots 1.WA98: Hadronic emission of photons dominated by hadrons: M<2 GeV 2.PHENIX, LHC: Hadrons dominant for M<1GeV. QGP ‘visible’ around 1.5GeV. 1.WA98: Hadronic emission of photons dominated by hadrons: M<2 GeV 2.PHENIX, LHC: Hadrons dominant for M<1GeV. QGP ‘visible’ around 1.5GeV.