Work

Study of $Λ$ $CP$ Asymmetry Parameter and Electric Dipole Moment at the Super Tau-Charm Facility

Year: 2026

Type: preprint

Abstract: Searching for new mechanisms of $CP$ violation beyond the Standard Model is essential to explain the observed matter-antimatter asymmetry of the universe. By analyzing the full angular distribution of the quantum-entangled $Λ\barΛ$ pairs from $J/ψ$ decays, the preliminary sensitivity of $CP$ asymmetry parameter $A_{CP}$ and Electric Dipole Moment of $Λ$ is studied at the future Super Tau-Charm Facility (STCF). Based on $3.4 \times 10^{12}$ $J/ψ$ events at STCF, the projected sensitivity for $A_{CP}^Λ$ reaches the $10^{-4}$ level, while the $Λ$ EDM can be probed at $10^{-20}$ $e$ cm. These results highly indicate that STCF will provide an unprecedented opportunity to search for new mechanisms of $CP$ violation with an expected world-leading precision.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.29819

Authors: Yu, Mingyu, Zhang, Jianyu, Fu, Jinlin, Huang, Xingtao

Institutions: Shandong University, National Centre for Nuclear Research, University of Chinese Academy of Sciences

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Strong, National Natural Science Foundation of China, Chinese Academy of Sciences

Awards: G1949059693, G3190654655, G3283081428, G4606853606, G6523243217

OpenAlex ID: W7223226267

Cites: 1

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