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Optimal Observables for the Chiral Magnetic Effect from Machine Learning

26 Oct 2025, 11:40
20m
汉宫(Han Palace)

汉宫(Han Palace)

桂林大公馆酒店 No. 2, Zhongyin Road, Xiufeng District, Guilin
Oral 自旋极化和手征效应(spin polarization and chiral effect) Parallel II

Speaker

Mr 梓谊 刘 (清华大学物理系)

Description

The detection of the Chiral Magnetic Effect (CME) in relativistic heavy-ion collisions remains challenging due to substantial background contributions that obscure the expected signal. In this Letter, we present a novel machine learning approach for constructing optimized observables that significantly enhance CME detection capabilities. By parameterizing generic observables constructed from flow harmonics and optimizing them to maximize the signal-to-background ratio, we systematically develop CME-sensitive measures that outperform conventional methods. Using simulated data from the Anomalous Viscous Fluid Dynamics framework, our machine learning observables demonstrate up to 90\% higher sensitivity to CME signals compared to traditional γ and δ correlators, while maintaining minimal background contamination. The constructed observables provide physical insight into optimal CME detection strategies, and offer a promising path forward for experimental searches of CME at RHIC and the LHC.

Primary authors

Prof. Dmitri Kharzeev ({Center for Nuclear Theory, Department of Physics and Astronomy) Prof. Kazuki Ikeda (Department of Physics, University of Massachusetts Boston) Prof. Yuji Hirono (Institute of Systems and Information Engineering, University of Tsukuba) Mr 梓谊 刘 (清华大学物理系) Prof. 舒哲 施 (Department of Physics, Tsinghua University)

Presentation materials

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