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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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slide1

Dileptons and Photons

K. Duslingand I. Z.

BNL 09

outline
Outline
  • Motivation
  • Rates
  • Evolution
  • Experiments
expand in stable hadrons

Resonance Gas: J=ρ+ρ’+..

+2+3, …-Pi, +2+3, …-K

+2+3, …-N

Expand in Stable Hadrons
in practice nf 2
In Practice: NF=2

Chiral Limit and zero-mtm pion:

va mixing lxr restoration
VA Mixing=LxR Restoration?

Dey, Eletsky, Ioffe 96

expansion parameter
Expansion Parameter:

 = 0

Dilute!

slide20
Data :

 e+e-

  Decay

.

1 nucleon final state
1 Nucleon Final State

=

+

1 Loop ChPT

N- Transition

input at the photon point
Input at the Photon Point

N background

va mixing in
VA Mixing in

T=180 MeV

va mixing in1

a1a1

VA Mixing in

T=150 MeVμb=225 MeV

slide26
wQGP:

l+

l+

l-

l-

slide27
wQGP:

LPM Effect: Aurenche et al 02

slide28
wQGP: γ

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

sqgp ope
sQGP: OPE

Hansson and Zahed 91

hydro parameters

Hydro Parameters

SPS, RHIC and LHC

chemical freezeout
Chemical Freezeout:

Fireball cools faster x Rates higher = w/μπ !

na60 dimuons upshots
NA60 dimuons : Upshots
  • Hadronic emission dominant: VA mixing
  • Partonic emission small: tiny QGP
  • Blue shifted spectra (M=rho): small Lh?
phenix

PHENIX

Dusling+Z 07

Dusling+Z 09

phenix di electrons upshots
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?
versus kinetic

Versus Kinetic

Turbide, Rapp, Gale 04; Liu, Rapp 07

slide46

WA98

0<qT (GeV) <4

0<qT (GeV)<0.8

N:x2

rates at rhic

Rates at RHIC

RHIC1

RHIC2

phenix1

PHENIX

RHIC1

RHIC2

lhc s 5 5 tev

LHC: √s=5.5 TeV

0<qT(GeV)<2

1<qT (GeV)<5

wa98 and phenix photons upshots
WA98 and PHENIX Photons : Upshots
  • WA98: Hadronic emission of photons dominated by hadrons: M<2 GeV
  • PHENIX, LHC: Hadrons dominant for M<1GeV. QGP ‘visible’ around 1.5GeV.