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

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

$\alpha ({{\mathit \Xi}^{-}}$) for ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ INSPIRE search

OUR FIT value is obtained from measurements of $\alpha\mathrm {({{\mathit \Xi}^{-}})}$, $\alpha _{−}({{\mathit \Lambda}}$), and $\alpha\mathrm {({{\mathit \Xi}^{-}})}{}\alpha _{−}({{\mathit \Lambda}}$).
S022A
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.385 \pm0.008}$ OUR FIT  Error includes scale factor of 2.4.
$-0.367$ $\pm0.004$ ${}^{+0.003}_{-0.004}$ 144k
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. • • •
$-0.376$ $\pm0.007$ $\pm0.003$ 73k
ABLIKIM
2022AD
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
$-0.344$ $\pm0.025$ $\pm0.007$ 5.4k
ABLIKIM
2022BE
 BES3 ${{\mathit \psi}{(3686)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
  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