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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

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

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

Presentation materials