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Dileptons and Photons at Collider Energies. K. Dusling , C.H. Lee and I . Zahed. QM14. Outline. Set up Rates, Evolution Experiments. Formally. acceptance. evolution. rate. time. Rates: Hadrons. Equilibrium averaging. l +. l +. l -. l -. Resonance Gas. + …. 1,2,3, …-Pi,.

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Dileptons and Photons at Collider Energies

K. Dusling, C.H. Lee and I. Zahed.

QM14


Outline
Outline

  • Set up

  • Rates,

  • Evolution

  • Experiments


Formally
Formally

acceptance

evolution

rate

time




Chiral reduction

Resonance Gas

+ …

1,2,3, …-Pi,

1,2,3-N

+ …

Chiral Reduction


Vector axial mixing
Vector-Axial Mixing: κ

κ

Chiral Limit and zero-mtm pion:


Va mixing explicitly
VA-Mixing explicitly

Dey, Eletsky, Ioffe 96




Flavour susceptibility
Flavour Susceptibility:


Rates sqgp
Rates: sQGP


sQGP:

l+

l+

l-

l-

Hansson and Zahed 91’


Sqgp rates
sQGP Rates



Sample hydro evolution
Sample hydro evolution

Faster cooling x higher rates: same



Dileptons na60 phenix star
Dileptons: NA60, Phenix, Star


Na60 dn d 140 95
NA60 : dN/dη=140 95’





WA98

0<qT (GeV) <4

0<qT (GeV)<0.8


Phenix

PHENIX

RHIC1

RHIC2



Achievements
Achievements

  • EM “OK”*

  • LxR “restored”

  • QGP “visible”

  • V2 “low”

(* π<<ρ)


Na45 95
Na45: 95’

Phenix: 07’

Na60:03’

Star: 13’



Phenix extrapolation

PHENIX extrapolation: γ

PHENIX: M<<qv

1

15% Systematics!


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