${{\mathit \Xi}}$ DECAY PARAMETERS

See the ``Note on Baryon Decay Parameters'' in the neutron Listings.

$\Delta \phi _{CP}$ = ($\phi _{-}$+ $\phi _{+}$)/2 INSPIRE search

S022A02
VALUE ($^\circ{}$) EVTS DOCUMENT ID TECN  COMMENT
$-0.17$ $\pm0.46$ ${}^{+0.17}_{-0.40}$ 267k 1
ABLIKIM
2024AR
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$-0.28$ $\pm0.78$ $\pm0.17$ 73k 2
ABLIKIM
2022AD
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
$-2.86$ $\pm2.98$ $\pm0.17$ 5.4k 3
ABLIKIM
2022BE
 BES3 ${{\mathit \psi}{(3686)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
1  Converted from radians to degrees. ABLIKIM 2022BE reports a value of ($-0.3$ $\pm0.8$ ${}^{+0.3}_{-0.7}$) $ \times 10^{-2}$ radians.
2  Converted from radians to degrees. ABLIKIM 2022AD reports a value of ($-0.5$ $\pm1.4$ $\pm0.3$) $ \times 10^{-2}$ radians.
3  Converted from radians to degrees. ABLIKIM 2022BE reports a value of ($-5.0$ $\pm5.2$ $\pm0.3$) $ \times 10^{-2}$ radians.
  References:
ABLIKIM 2024AR
PRL 132 101801 Investigating the $\Delta I = 1/2$ rule and CP violation through the measurement of decay asymmetry parameters in $\Xi^-$ decays
ABLIKIM 2022BE
PR D106 L091101 Observation of ?- hyperon transverse polarization in ?(3686)??-?¯+
ABLIKIM 2022AD
NAT 606 64 Probing CP symmetry and weak phases with entangled double-strange baryons