| Issue |
EPJ Web Conf.
Volume 282, 2023
8th International Symposium on Symmetries in Subatomic Physics (SSP 2022)
|
|
|---|---|---|
| Article Number | 01002 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/202328201002 | |
| Published online | 03 April 2023 | |
https://doi.org/10.1051/epjconf/202328201002
Discrete symmetry tests using hyperon-antihyperon pairs
1 Uppsala University, Sweden
2 National Centre for Nuclear Research, Poland
* e-mail: Andrzej.Kupsc@physics.uu.se
Published online: 3 April 2023
The BESIII experiment has accumulated millions of spin entangled hyperon–antihyperon pairs from the decays of the J/ψ and ψ(2S ) mesons produced in electron–positron collisions. Using multi-dimensional methods to analyze the angular distributions in the sequential decays the hyperon and antihyperon decay amplitudes are studied and tests of the combined charge-conjugation–parity (CP) symmetry are performed. Implications of the recent results using J/ψ decays into Λ
and Ξ−
are presented. For the cascade decay chain, the exclusive measurement allows for three independent CP tests and the first direct determination of the weak phases.
© The Authors, published by EDP Sciences, 2023
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