${{\mathit \Xi}}$ 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   JSON  (beta) PDGID:
S022A
OUR FIT value is obtained from measurements of $\alpha\mathrm {({{\mathit \Xi}^{-}})}$, $\alpha _{−}({{\mathit \Lambda}}$), and $\alpha\mathrm {({{\mathit \Xi}^{-}})}{}\alpha _{−}({{\mathit \Lambda}}$).
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