Phenomenological signals of QCD critical point in heavy-ion collisions
- Dr. Akihiko MONNAI
- Dr. Akihiko MONNAI (Institut de Physique Théorique, CNRS/CEA)
The properties of a QCD medium at finite density is extensively studied in the recent beam energy scan program at BNL Relativistic Heavy Ion collider. One of the main goals of the program is to understand the QCD phase structure and to verify the existence of a critical point. A difficulty in such analyses is that a signal of the critical point could be thermally washed away if its location is far from the freeze-out, unless its effects on dynamical evolution is sizable enough to modify the freeze-out hypersurface.
The relativistic hydrodynamic model has been proven to be a powerful tool for heavy-ion analyses in the past decades. In this study, we propose to extend the model to lower energies at finite density and estimate thermal photon spectra and flow harmonics. Since the medium is electromagnetically transparent, there is an advantage that the critical point does not have to be near the freeze-out for its photonic signal to be detectable. We present the results from (2+1)-dimensional hydrodynamic simulation and discuss their phenomenological consequences.