Spin asymmetry and dipole moments in tau-pair production with ultraperipheral heavy ion collisions

by Dr 鼎煜 邵

Thursday 21 Dec 2023, 10:00 → 11:30 Asia/Shanghai

摘要：

The anomalous magnetic and electric dipole moments of the tau lepton serve as crucial indicators of new physics beyond the Standard Model. Leveraging azimuthal angular asymmetry as a novel tool in ultraperipheral collisions (UPCs), we attain unparalleled precision in the study of these key properties. Driven by the highly linear polarization of coherent photons, this method uniquely enables both the MDM and EDM to contribute to the cos2ϕ angular distribution in similar magnitudes. Importantly, our approach substantially narrows the parameter space, excluding more than half of it compared to expected UPC-based measurements reliant solely on the total cross-section. This method not only provides improved constraints but also minimizes the need for additional theoretical assumptions.

报告人介绍：

邵鼎煜，复旦大学物理学系青年研究员。2009年于南开大学物理学院获学士学位，2014年于北京大学获得博士学位，先后在瑞士Bern大学、 欧洲核子研究中心理论部、美国加州大学洛杉矶分校从事博士后工作，2021年加入复旦大学。研究方向包括：微扰 QCD与对撞机物理、自旋物理等。