Subatomic fluid spintronics- Global hyperon polarization in heavy ion collisions at RHICProf. Michael Lisa

Physics Department, The Ohio StateUniversity

时 间：2016年12月5日(周一) 15:00

地 点：物理学院量子报告厅(知新楼C702)

邀请人：徐庆华教授

Michael Lisa, Professor of The Ohio State University since 2005. He obtained Ph. D. in physics in 1993 from Michigan State University. He did postdoctoral research at Lawrence Berkeley National Lab during 1993-1996. Then he worked as assistant professor, associate professor in 1996 and 2001 at The Ohio State University. His research focus over the past several years has been on the experimental study of relativistic heavy ion collisions, with a goal of understanding the bulk properties of strongly-interacting matter under extreme conditions. He became a Fellow of the American Physical Society in 2004.

Abstract:

In 2000, first collisions at Brookhaven National Lab's Relativistic Heavy Ion Collider (RHIC) led to the surprising discovery that the deconfinedquark-gluon plasma (QGP) is best described as a "nearly perfect fluid.” These fluid properties remain the focus of intense study, and are providing insights into the Strong force in the non-perturbativeregime. I will discuss recent measurements by the STAR Collaboration at RHIC, on the spin alignment, or polarization, of Lambda hyperons with the angular momentum of the collision. These measurements allow an estimate of both the vorticityof the QGP and the magnetic field in which it evolves. Both of these

quantities far surpass any known system in the universe. Furthermore, knowledge of both is crucial to recent studies that may reveal the onset of chiral symmetry restoration in QCD.

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