Physics PAN Seminar by Prof. Michael Lisa (The Ohio State University)

Title: Subatomic Smoke Rings: Polarization and Toroidal Vorticity in the QGP

Abstract: Since the discovery of global hyperon polarization in Au+Au collisions at RHIC about five years ago, there has been intense theoretical and experimental focus on the topic. After a brief review, I will discuss novel vortex structures that may be generated in two situations. The first is a p+A collision, which may produce droplets of QGP that develop toroidal vortex ("smoke ring") structure. Experimental observation of such a structure would provide compelling evidence supporting the hydrodynamic nature of this tiny system, a much-debated topic today. The other is an idealized "hot moving spot" that may result from thermalization of a jet in an expanding QGP; in this case, the "smoke ring" centers on the jet direction. In both cases, we suggest an experimental observable to measure the toroidal vortex structure, and present present full hydrodynamical simulations to make quantitative predictions. I will also discus next steps for more realistic calculations.

https://arxiv.org/abs/2101.10872

https://arxiv.org/abs/2102.11919

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