Seminar “Theory of Hadronic Matter under Extreme Conditions”

Date and Time: Wednesday, 25 September 2019, at 4:00 PM

Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics

Seminar topic: “Investigating relativistic proton-nucleus collisions and the influence of electromagnetic fields on final hadronic observables”

Speaker: Lucia Oliva (GSI, Darmstadt & ITP, Goethe-Universit ̈at, Frankfurt am Main)

Abstract:

The recent experimental observations of azimuthally anisotropic flow in small systems at RHIC and LHC energies has stimulated new interest in these collisions, traditionally regarded only as control measurements for heavy-ion collisions and now becoming a new area of study for the formation and evolution of quark-gluon plasma. In the early stage of proton-nucleus collisions extremely intense electromagnetic fields are produced; respect to heavy-ion collisions, in these asymmetric systems the electric field generated along the impact parameter axis is very high and comparable to the magnetic field perpendicular to the reaction plane. Furthermore, particle rapidity densities are strongly asymmetric inside the overlap area due to the different number of nucleons in the colliding nuclei. One of the main effects of this combined asymmetry of electromagnetic fields and particle distributions is a splitting in the directed flow of positively and negatively charged mesons in the nucleus-going side. By means of microscopic calculations within the Parton-Hadron-String Dynamics (PHSD) approach we study the main features and final hadronic observables of p+Au reaction at top RHIC energy, investigating in particular the influence of the electromagnetic fields on flow anisotropies.

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