Tests of CP symmetry in entangled hyperon anti-hyperon pairs at BESIII

Abstract

Decays of charmonium into hyperon and antihyperon pairs provide a pristine laboratory for exploring hyperon properties, such as their polarization and decay parameters, and for conducting tests of fundamental symmetries. This brief review highlights the significant progress made in precise tests of CP symmetry at BESIII using entangled hyperon-antihyperon pairs, including $\Lambda \bar{\Lambda }$, $\Sigma \bar{\Sigma }$, $\Xi \bar{\Xi }$ and $\Lambda \bar{\Sigma }$, selected from the high statistics of $J/\psi$ and $\psi (3686)$ events produced in $e^{+}{e}^{-}$ annihilations. These recent findings have sparked renewed interest in both theoretical and experimental aspects of hyperon physics, but there is still much room for improvement to reach the Standard Model expectations. To address this challenge, the prospects for future investigations on CP asymmetry at next-generation experiments are discussed.

References in corpus (14)

• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Number of $J/\psi$ events at BESIII
• Weak phases and CP-symmetry tests in sequential decays of entangled double-strange baryons
• Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda -\bar{\Lambda }$ Pairs
• ${\Sigma }^{+}$ and ${\bar{\Sigma }}^{-}$ polarization in the $J/\psi$ and $\psi (3686)$ decays
• Determination of the number of $\psi (3686)$ events taken at BESIII
• Tests of $CP$ symmetry in the entangled ${\Xi }^0-{\bar{\Xi }}^0$ Pairs
• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• Observation of ${\Xi }^{-}$ Hyperon Transverse Polarization in $\psi (3686)\to {\Xi }^{-}{\bar{\Xi }}^{+}$
• Model independent determination of the spin of the ${\Omega }^{-}$ and its polarization alignment in $\psi (3686)\to {\Omega }^{-}{\bar{\Omega }}^{+}$
• Strong and weak $CP$ tests in sequential decays of polarized ${\Sigma }^0$ hyperons
• First simultaneous measurement of ${\Xi }^0$ and ${\bar{\Xi }}^0$ asymmetry parameters in $\psi (3686)$ decay
• Test of $CP$ Symmetry in Hyperon to Neutron Decays
• Novel method to extract the femtometer structure of strange baryons using the vacuum polarization effect

Cited by in corpus (1)

• $B\to K+$invisible, dark matter, and $CP$ violation in hyperon decays