electromagnetic probes of strongly interacting matter in heavy-ion collision
DESCRIPTION
Electromagnetic Probes of Strongly Interacting Matter in Heavy-Ion Collision. B. Kämpfer Research Center Rossendorf/Dresden. Spectra 2) Measuring Temperatures 3) Advanced Models 4) Charm. with K. Gallmeister, S. Zschocke supported by BMBF, GSI. Data. Simulation. Syst. Error est. - PowerPoint PPT PresentationTRANSCRIPT
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
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
PHENIXPHENIX
STARSTAR
NA60NA60
Experimental Overview
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
Road MapRoad Map
kinetic approaches
spectral functionV-A mixing
Emissivity of MatterEmissivity of Matter
no differenceno differenceof deconfinedof deconfinedand confinedand confinedmatter radiationmatter radiation
Measuring Temperatures
2. Heavy Ion Collisions
1. Universe
use qq rate as test function for thermal yield add hadron cocktail, DY, open charm
WMAPWMAP
<T> = 170 MeV
<T> = 145 MeV
<T> = T_f.o. ?<T> = T_f.o. ?
CERES 2004CERES 2004 Pb + AuPb + Au
CERES 95, 96, 158 AGeVCERES 95, 96, 158 AGeV
<T> = 170 MeV<T> = 170 MeVNA50:NA50: Issue: T vs. NIssue: T vs. N
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.
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
Predictions for RHICPredictions for RHIC
Turbile, Rapp, Gale 2003Turbile, Rapp, Gale 2003Gallmeister, Kampfer, Pavlenko 1998Gallmeister, Kampfer, Pavlenko 1998
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
??
sqrt(s) = 200 GeV, single esqrt(s) = 200 GeV, single e
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
R. RappR. Rappdetailed space-time scenariodetailed space-time scenario
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
1. VDM: V
V self-energies models
3. sum up all reaction channelsKinetic theory
2.2.
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