Testing of P and CP symmetries with e+e- → J/ψ Λ(Λ)over-bar

Article Multidisciplinary Sciences

Probing CP symmetry and weak phases with entangled double-strange baryons

M. Ablikim et al.

Summary: Although the standard model of particle physics has been successful, it fails to explain the imbalance of matter and antimatter in the Universe. We present a new method that uses entangled multi-strange baryon-antibaryon pairs to separate the strong and weak phases, allowing for precise measurements and the construction of independent CP observables. We also provide an independent measurement of the Lambda decay parameter.

NATURE (2022)

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Article Physics, Multidisciplinary

Precise Measurements of Decay Parameters and CP Asymmetry with Entangled Λ-(Λ)over-bar Pairs

M. Ablikim et al.

Summary: Based on 10 billion J/psi events collected at the BESIII experiment, a search for CP violation in Lambda decay is performed. With a five-dimensional fit to the full angular distributions of the daughter baryon, the most precise values for the decay parameters are determined, and the average decay parameter values for Lambda and (Lambda) over bar are extracted with unprecedented accuracy. These results play an important role in the studies of the polarizations and CP violations for the strange, charmed and beauty baryons.

PHYSICAL REVIEW LETTERS (2022)

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Article Multidisciplinary Sciences