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【直播】【复旦理论物理报告会】复旦大学顾嘉荫：轻子对撞机中对正定性无歧义的检测
直播二维码
本次报告由复旦大学物理系主办，于2021年10月8日9:30开始，授权蔻享学术进行网络直播。
轻子对撞机中对正定性无歧义的检测
报告人
顾嘉荫（复旦大学）
时间
2021年10月8日 9:30
报告摘要
The diphoton channel at lepton colliders, e+e- (mu+mu-) -> gamma gamma, has a remarkable feature that the leading new physics contribution comes only from dimension-eight operators. This contribution is subject to a set of positivity bounds, derived from fundamental principles of Quantum Field Theory, such as unitarity, locality, analyticity and Lorentz invariance. These positivity bounds are thus applicable to the most direct observable --- the diphoton cross sections. This unique feature provides a clear, robust, and unambiguous test of these principles. We estimate the capability of various future lepton colliders in probing the dimension-eight operators and testing the positivity bounds in this channel. We show that positivity bounds can lift certain flat directions among the effective operators and significantly change the perspectives of a global analysis. We also perform a combined analysis of the gamma gamma / Z gamma / ZZ processes in the high energy limit and point out the important interplay among them.
报告人介绍
图 | 顾嘉荫
Jiayin Gu obtained his PhD at the University of California, Davis in 2014. He worked as a postdoctoral researcher at IHEP, DESY and Mainz before joining Fudan University in 2021 as a faculty member. In recent years, his work mainly focuses on the Standard Model Effective Field Theory (SMEFT) and its applications on precision Higgs and electroweak measurements at future colliders. He is also an active contributor to various future collider projects, with a major contribution to the EFT analysis in the CEPC conceptual design report.
复旦大学物理系理论物理报告会
复旦理论物理报告会，每周五上午9:30举行，报告时间为一到两个小时。报告会旨在加强国内外理论物理前沿研究进展的互动，着重凝聚态物理、量子信息和原子分子光学等学科中重要的理论物理方面的最新进展和发展方向。通过加强交流，促进不同物理学科的交叉互通， 启发新的研究角度和新科学思想。提高研究生对前沿理论物理研究动向的敏感度和思考新物理问题尤其是交叉学科问题的积极性。
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https://www.koushare.com/topicIndex/i/phys-fudan
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