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Electromagnetic Probes of Strongly Interacting Matter in Heavy-Ion Collision
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Transcript of Electromagnetic Probes of Strongly Interacting Matter in Heavy-Ion Collision
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Electromagnetic Probesof Strongly Interacting Matter
in Heavy-Ion CollisionB. Kämpfer
Research Center Rossendorf/Dresden
1) Spectra2) Measuring Temperatures3) Advanced Models4) Charm
with K. Gallmeister, S. Zschocke supported by BMBF, GSI
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HADES C+C@2AGeV
No Efficiency / Acceptance Correctioninv. Mass [MeV/c2]
dN
/dM
[1.
/MeV
/co
ll.] Simulation
Data
Syst. Error est.
Syst. Bias for M<150 MeV/c2
preliminary
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PHENIXPHENIX
STARSTAR
NA60NA60
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Experimental Overview
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Hadrons in Collisionsmall systems: ll*,
continuous monitoring of evolutionpenetrating probes
emission rates
= ret. current-current correlator= ret. photon self-energy in medium
probes the medium in all stages
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Road MapRoad Map
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kinetic approaches
spectral functionV-A mixing
Emissivity of MatterEmissivity of Matter
no differenceno differenceof deconfinedof deconfinedand confinedand confinedmatter radiationmatter radiation
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Measuring Temperatures
2. Heavy Ion Collisions
1. Universe
use qq rate as test function for thermal yield add hadron cocktail, DY, open charm
WMAPWMAP
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<T> = 170 MeV
<T> = 145 MeV
<T> = T_f.o. ?<T> = T_f.o. ?
CERES 2004CERES 2004 Pb + AuPb + Au
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CERES 95, 96, 158 AGeVCERES 95, 96, 158 AGeV
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<T> = 170 MeV<T> = 170 MeVNA50:NA50: Issue: T vs. NIssue: T vs. N
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Photons, tooPhotons, tooGallmeister et al:Gallmeister et al:S beam:S beam:HELIOS-3,HELIOS-3,NA38,NA38,CERESCERES
Low kT:Low kT:Correction a laCorrection a laArnold et al.Arnold et al.
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Advanced ModelsAdvanced Models
fireball/hydro: T(t,x), n(t,x)fireball/hydro: T(t,x), n(t,x)
T(0), QGP vs. Hadron Gas T(0), QGP vs. Hadron Gas
SPS 158 AGeVSPS 158 AGeV
Rapp ...Rapp ...Gale...Gale...Ruuskanen ...Ruuskanen ...Srivastava ...Srivastava ...Alam ...Alam ...
transport: no sensitivity to deconfinement transport: no sensitivity to deconfinement
T(0) > Tc T(0) > Tc molten rhomolten rho
Cassing ...Cassing ...Stoecker ...Stoecker ...Srivastava ...Srivastava ...Bass ...Bass ...
further developments: jet radiation, further developments: jet radiation, correlationscorrelations
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Predictions for RHICPredictions for RHIC
Turbile, Rapp, Gale 2003Turbile, Rapp, Gale 2003Gallmeister, Kampfer, Pavlenko 1998Gallmeister, Kampfer, Pavlenko 1998
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CharmCharm
within NA50 acceptance:within NA50 acceptance: fireball radiation = charm yieldfireball radiation = charm yield
decision by NA60 decision by NA60
Ruuskanen, Vogt, ... Gallmeister:Ruuskanen, Vogt, ... Gallmeister:di-leptons from correlated open charm dominatedi-leptons from correlated open charm dominate
Shuryak: energy loss of charm suppresses this yieldShuryak: energy loss of charm suppresses this yield
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??
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sqrt(s) = 200 GeV, single esqrt(s) = 200 GeV, single e
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Summary• many e+e-, mu+mu-, photon spectramany e+e-, mu+mu-, photon spectra• thermal radiation at CERN-SPS identifiedthermal radiation at CERN-SPS identified T(0) > Tc: T(0) > Tc: deconfinement molten rho: molten rho: chiral symmetry restoration• waiting for more precise spectra at RHICwaiting for more precise spectra at RHIC• charm is at hand: charm is at hand: minor energy loss
Shopping List:Shopping List:• NA60 data (abnormal open charm?)NA60 data (abnormal open charm?)• pp and AA spectrapp and AA spectra• multi-differential spectramulti-differential spectra
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R. RappR. Rappdetailed space-time scenariodetailed space-time scenario
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adjust T_i, T_f to CERES dataadjust T_i, T_f to CERES data
Issues:Issues:- chemical off-equilibrium- chemical off-equilibrium in deconfined & hadronin deconfined & hadron mediummedium- baryon density effects - baryon density effects
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1. VDM: V
V self-energies models
3. sum up all reaction channelsKinetic theory
2.2.
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Emission Rate of Deconfined Matter
1. Dileptons1. Dileptons
Improved:Improved:Aurenche,Gelus, Morre, Zaraket (2000)Aurenche,Gelus, Morre, Zaraket (2000)
2. Photons2. Photons
Improved:Improved:Arnold, Moore, Yaffe (2001)Arnold, Moore, Yaffe (2001)
Lattice QCD Lattice QCD Bielefeld 2002Bielefeld 2002
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