BESIII sets world's most stringent direct limit on Lambda hyperon electric dipole moment
Researchers at the BESIII Collaboration have achieved the most precise measurement to date of the electric dipole moment of the Lambda hyperon. This finding helps scientists probe charge-parity violation, which is essential for understanding why the universe is dominated by matter rather than antimatter.
Why it matters
This measurement provides critical data for testing the Standard Model of physics and searching for new phenomena that could explain the cosmic matter-antimatter imbalance.
edited by Gaby Clark , reviewed by Robert Egan
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Add as preferred source Artistic illustration of the quantum-entangled Lambda–anti-Lambda system used in the BESIII electric dipole moment measurement. Credit: The BESIII Collaboration The BESIII Collaboration, led by the Institute of High Energy Physics of the Chinese Academy of Sciences, has achieved the world's most precise measurement of the electric dipole moment (EDM) of the Lambda (Λ) hyperon using quantum-entangled Λ–anti-Λ pairs produced in J/ψ decays. The result improves the experimental sensitivity by about three orders of magnitude compared with the previous measurement, providing a new way to probe charge-parity (CP) violation in particles containing strange quarks.
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