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Welcome to the Research Group of Tetyana Galatyuk

Members of the ViP-QM group on December 6th 2019.
Members of the ViP-QM group on December 6th 2019.

Helmholtz Young Investigator Group:

ViP-QM – Exploring Quark Matter with Virtual Photons

Exploring cosmic states of matter …

Sketch of the phase diagram of strongly interacting (QCD) matter.
Sketch of the phase diagram of strongly interacting (QCD) matter.

During the last decades, substantial effort has been devoted to the study of nuclear matter far from its ground state. The goal of this endeavour is to explore the phase structures of strong-interaction matter, which is governed by the laws of Quantum Chromo Dynamics (QCD), by creating extreme states of matter in the laboratory. The phase diagram of QCD matter, indicating the conjectured phase boundaries in a graph correlating temperature (T) and baryochemical potential (mu_B), is shown in Figure 1. In the very early Universe the matter was balanced by antimatter and thus characterised by vanishing baryochemical potential (mu_B = 0) and high temperatures. Compact stellar objects like neutron stars, on the other hand, have comparatively small temperatures and large baryochemical potential.

Electron-positron pairs are radiated throughout the whole time evolution of a heavy-ion collision.
Electron-positron pairs are radiated throughout the whole time evolution of a heavy-ion collision.

Real and virtual photons emitted from the hot and dense collision zone formed in heavy-ion reactions are a unique tool for investigating properties of strong-interaction matter under extreme conditions. Electromagnetic probes (dileptons and photons) carry important information about the decaying objects to the detectors without being affected by strong final-state interaction while traversing the medium. The key objective of using dileptons as probes is to gain insight to the mechanism of dynamical chiral symmetry breaking, changes in the degrees of freedom, and possibly to discover unconventional states of matter.

… in the laboratory

Our group aims at pursuing a dilepton program at the present GSI facility withwith the HADES, at the BNL facility with STAR and at the future FAIR facility with CBM in order to systematically map out how the dilepton signals change across the QCD phase diagram and in this way reflect its structure. The particular focus is put on matter at high net-baryon densities and moderate temperatures.