PreprintarXiv licencearXiv
Study of Λ CP Asymmetry Parameter and Electric Dipole Moment at the Super Tau-Charm Facility
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 ΛΛ̅ pairs from J/ψ decays, the preliminary sensitivity of CP asymmetry parameter ACP and Electric Dipole Moment of Λ is studied at the future Super Tau-Charm Facility (STCF). Based on 3.4 × 1012 J/ψ events at STCF, the projected sensitivity for ACPΛ 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.
Related
- Probing the chromo-electric dipole moment of top quark near the toponium production threshold at LHC
- Transverse Tau Spin Correlations and the Weak Electric Dipole Moment at Future Z Factories
- An improved limit on 171Yb electric dipole moment
- Dihadron azimuthal asymmetry and light-quark dipole moments at the Electron-Ion Collider
- An atom-based machine-learned dipole-moment model and application to conjugated systems
BibTeX
@misc{yu2026study,
title = {{Study of $Λ$ $CP$ Asymmetry Parameter and Electric Dipole Moment at the Super Tau-Charm Facility}},
author = {Mingyu Yu and Jianyu Zhang and Jinlin Fu and Xingtao Huang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29819},
eprint = {2610.29819},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29819},
}
RIS
TY - UNPB
TI - Study of Λ CP Asymmetry Parameter and Electric Dipole Moment at the Super Tau-Charm Facility
AU - Mingyu Yu
AU - Jianyu Zhang
AU - Jinlin Fu
AU - Xingtao Huang
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29819
UR - https://arxiv.org/abs/2610.29819
AB - 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 ΛΛ̅ 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 × 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.
ER -