Electromagnetic probes of the QGP

被引:1
作者
Bratkovskaya, E. L. [1 ]
Linnyk, O. [2 ]
Cassing, W. [2 ]
机构
[1] Goethe Univ Frankfurt, Inst Theoret Phys, Frankfurt, Germany
[2] Univ Giessen, Inst Theoret Phys, Giessen, Germany
来源
3RD INTERNATIONAL CONFERENCE ON NEW FRONTIERS IN PHYSICS | 2015年 / 95卷
关键词
QUARK-GLUON PLASMA; LOW-MASS DILEPTONS; PLUS P COLLISIONS; DIRECT PHOTONS; DYNAMICS; HOT; ENHANCEMENT; EMISSION;
D O I
10.1051/epjconf/20159501002
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigate the properties of the QCD matter across the deconfinement phase transition in the scope of the parton-hadron string dynamics (PHSD) transport approach. We present here in particular the results on the electromagnetic radiation, i.e. photon and dilepton production, in relativistic heavy-ion collisions. By comparing our calculations for the heavy-ion collisions to the available data, we determine the relative importance of the various production sources and address the possible origin of the observed strong elliptic flow v(2) of direct photons. We argue that the different centrality dependence of the hadronic and partonic sources for direct photon production in nucleusnucleus collisions can be employed to shed some more light on the origin of the photon v(2) "puzzle". While the dilepton spectra at low invariant mass show in-medium effects like an enhancement from multiple baryonic resonance formation or a collisional broadening of the vector meson spectral functions, the dilepton yield at high invariant masses (above 1.1 GeV) is dominated by QGP contributions for central heavy-ion collisions at ultrarelativistic energies. This allows to have an independent view on the parton dynamics via their electromagnetic massive radiation.
引用
收藏
页数:12
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