Speaker
Description
With the large datasets on 𝑒+𝑒−-annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances
collected at the BESIII experiment, multi-dimensional analyses making use of
polarization and entanglement can shed new light on the production and decay
properties hyperon-antihyperon pairs. In a series of recent studies performed at
BESIII, significant transverse polarization of the (anti)hyperons has been observed
in 𝐽/𝜓 or 𝜓(3686) to ΛΛ ̄ , ΣΣ ̄ , ΞΞ ̄, and Ω - anti- Ω + and the spin of Ω− has
been determined model independently for the first time. The decay parameters for the
most common hadronic weak decay modes were measured, and due to the non-zero
polarization, the parameters of hyperon and antihyperon decays could be determined
independently of each other for the first time. Comparing the hyperon and
antihyperon decay parameters yields precise tests of direct, Δ𝑆 = 1 CP-violation
that complement studies performed in the kaon sector.
| In-person participation | Yes |
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