#### ${{\mathit \Xi}^{0}}$ DECAY PARAMETERS

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

#### $\alpha\mathrm {({{\mathit \Xi}^{0}} )}$ $\alpha _{−}({{\mathit \Lambda}}$ )

This is a product of the ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ and ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ asymmetries.
VALUE EVTS DOCUMENT ID TECN  COMMENT
 $\bf{ -0.261 \pm0.006}$ OUR AVERAGE
$-0.276$ $\pm0.001$ $\pm0.035$ 4M
 2010 B
NA48 ${{\mathit p}}$ Be, 400 GeV
$-0.260$ $\pm0.004$ $\pm0.005$ 300k
 1982
SPEC FNAL hyperons
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.317$ $\pm0.027$ 6075
 1978
SPEC FNAL hyperons
$-0.35$ $\pm0.06$ 505
 1974
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 1.75 ${\mathrm {GeV/}}\mathit c$
$-0.28$ $\pm0.06$ 739
 1969
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 1.7$-$2.6 ${\mathrm {GeV/}}\mathit c$
References:
 BATLEY 2010B
PL B693 241 New Precise Measurements of the ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$ and ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$ Decay Asymmetries
 HANDLER 1982
PR D25 639 Precise Measurement of the Asymmetry Parameter in the Decay ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$
 BUNCE 1978
PR D18 633 A New Measurement of the ${{\mathit \Lambda}}$ Helicity in the Decay ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$
 BALTAY 1974
PR D9 49 Properties of ${{\mathit \Xi}^{-}}$ and ${{\mathit \Xi}^{0}}$ Hyperons
 DAUBER 1969
PR 179 1262 Production and Decay of Cascade Hyperons