Speaker
Description
e+e− annihilation provide a clean source of baryon excitations. With the large datasets
of J/psi and psi(3686) collected at BESIII, recent results of excited nucleon states as
well as excited hyperon states from BESIII will be reported, including studies of Xi in
psi(3686)-> K- Lambda Xi+ +c.c. , N in psi(3686) -> p pbar pi0/eta, Lambda and
Sigma in psi(3686)-->Lambda Sigma-bar pi0, etc. Recent results of baryon
spectroscopy at Belle will be reported as well.
Furthermore, 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
ΛΣ-bar , ΣΣ-bar , ΞΞ-bar .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.
