Relativistic Heavy Ions Experiment IV Photons and Neutral Mesons.

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Presentation transcript:

Relativistic Heavy Ions Experiment IV Photons and Neutral Mesons

Time Evolution of a Heavy Ion Collision

Photon Sources in A+A Collisions

Hard direct Photons E.M. Bremsstrahlung Prompt Photon Sources in p+p Reactions

Prompt Photons Photons from Jet-Fragmentation Fraction of Prompt Photons in p+p Reactions

Photon Spectrum in p+p

Photons in p+p and p+A

Thermal photons from the hot medium Jet-photon conversion in the medium Additional Photon Sources in A+A

Turbide, Rapp, Gale, Phys. Rev. C 69 (014903), 2004 Theoretical Expectation in A+A

Rear View of Leadglass Block (Super Module)

Lead Glass Calorimeter in WA98

Electromagnetic Calorimeter in PHENIX

PHENIX Experiment

Photons from Radiative Decays in Pb+Pb at 158AGeV

Background Photons from Radiative Decays

Systematic Errors of Direct Photon Measurement in Pb+Pb

Ratio of Measured to Background Photons

Direct Photon Spectrum in Pb+Pb at 158AGeV

k t -broadening + T i = 205MeV no k t -broadening + T i = 270MeV Turbide, Rapp, Gale, Phys. Rev. C 69 (014902), 2004 Prompt and Thermal Photons in Pb+Pb at 158AGeV

T i = MeV QGP + HG + pQCD (Non-boost inv. hydro) Huovinen, Ruuskanen, Räsänen (Nucl. Phys. A 650 (227) 1999) T i = MeV Pure HG + pQCD (Non-boost inv. hydro) T i = 335 MeV,   = 0,2 fm/c QGP + HG + pQCC (Bjorken hydro) Svrivastava (nucl-th/ ) 250 < T i < 370 MeV, 0,5 <   < 3 fm/c QGP + HG + pQCDRenk (Phys.Rev.C67:064901,2003) T i = MeV,   = 0,5 fm/c QGP + HG + pQCD without k T T i = 205 MeV,   = 1 fm/c QGP + HG + pQCD with k T Turbide, Rapp, Gale (Phys.Rev.C69:014903,2004 ) Theoretical Descriptions and Initial Temperatures T i

p+p measurement scaled with N coll Prompt Photons in Au+Au,  s = 200GeV

Direct Photon Measurement via Virtual Photons phase space factor form factor invariant mass of Dalitz pair invariant mass of virtual photon Compton q  g q e+e+ e-e- 00 e+e+ e-e-  

   S/B=~1    Direct Photon Measurement via Virtual Photons

   S/B=~1    calculated from Dalitz formula measured R data ÷ RR RR R direct measured with EMCal Direct Photon Measurement via Virtual Photons