学术报告（5月26日）

主持人：尤郑昀 教授

摘要: sPHENIX is a next-generation nuclear physics experiment providing world-class capabilities for multiscale studies of the strongly coupled quark gluon plasma (QGP), planned for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) in 2022 and beyond. The goal of the sPHENIX experiment is to study the microscopic nature of the quark-gluon-plasma that is believed to have existed a few microseconds after the Big Bang, filling the entire universe at a temperature of several trillion Kelvin. Measurements at RHIC and the Large Hadron Collider (LHC) at CERN have both confirmed the existence of the QGP. The QGP created in heavy nuclei collisions at very high energy has been seen to have novel emergent properties, such as very low viscosity close to the quantum limit. Measurements of hadronic jets will reveal the internal structure of the QGP via their scattering with quasi-particles in the medium. Bottom quark jets (b-jets) and B-mesons produced in heavy ion collisions at RHIC offer a unique set of observables due to the large bottom quark mass, but need to be measured across an unexplored kinematic regime. These measurements of b-jets and B-mesons are essential to produce a complete understanding of the plasma. sPHENIX is a state-of-the-art jet detector designed to collect a suite of unique jet observables with unprecedented statistics. Reconstruction and identification of b-jets and B-mesons requires both precision tracking of charged particles close to the beam collision point and high detection efficiency. We propose to build a Monolithic-Active-Pixel-Sensor based precision vertex detector (MVTX) to ensure the sPHENIX inner tracker is capable of performing these key measurements.

报告人简介：

Ming Liu 研究员本科毕业于清华大学半导体系（EE），博士毕业于耶鲁大学粒子物理专业，现为美国Los Alamos国家实验室研究员，领导高能核物理团队，从事粒子物理学基础研究中的夸克胶子等离子体、重离子对撞、质子自旋结构等方面的研究。