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

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

#### $\alpha$ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$

See the note above on Radiative Hyperon Decays.''
VALUE EVTS DOCUMENT ID TECN  COMMENT
$-0.704$ $\pm0.019$ $\pm0.064$ 52k 1
 2010 B
NA48 ${{\mathit p}}$ Be, 400 GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.78$ $\pm0.18$ $\pm0.06$ 672
 2004 A
NA48 See BATLEY 2010B
$-0.43$ $\pm0.44$ 87 2
 1990
SPEC FNAL hyperons
 1 BATLEY 2010B also measured the ${{\overline{\mathit \Xi}}^{0}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \gamma}}$ asymmetry to be $-0.798$ $\pm0.064$ (no systematic error given) with 4769 events.
 2 The sign has been changed; see the erratum, JAMES 2002 .
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
 LAI 2004A
PL B584 251 Measurement of the ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$ Decay Asymmetry and Branching Fraction
 JAMES 1990
PRL 64 843 Branching Ratio and Asymmetry for ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$