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

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

${[\alpha\mathrm {({{\mathit \Xi}^{-}})}\alpha_-({{\mathit \Lambda}}) − {{\overline{\mathit \alpha}}}{{{\overline{\mathit \Xi}}^{+}}}\alpha_+({{\overline{\mathit \Lambda}}})]\over \lbrack{}\alpha\mathrm {({{\mathit \Xi}^{-}})}\alpha_-({{\mathit \Lambda}}) + {{\overline{\mathit \alpha}}}{{{\overline{\mathit \Xi}}^{+}}}\alpha_+({{\overline{\mathit \Lambda}}})]}$

INSPIRE   JSON  (beta) PDGID:
S022ACP
This is zero if $\mathit CP$ is conserved. The $\alpha $'s are the decay-asymmetry parameters for ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ and ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ and for ${{\overline{\mathit \Xi}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$ and ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$.
VALUE ($ 10^{-4} $) EVTS DOCUMENT ID TECN  COMMENT
$0.0$ $\pm5.1$ $\pm4.4$ 158M
HOLMSTROM
2004
HYCP ${{\mathit p}}$ Cu, 800 GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$+120$ $\pm140$ 252k
LUK
2000
E756 ${{\mathit p}}$ Be, 800 GeV
Conservation Laws:
$\mathit CP$ INVARIANCE
References