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

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

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

INSPIRE   JSON  (beta) PDGID:
S023LG
See the note above on ``Radiative Hyperon Decays.''
S023LG
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.72 \pm0.05}$ OUR AVERAGE
$-0.741$ $\pm0.062$ $\pm0.019$ 0.64k 1
ABLIKIM
2025AL
 
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}^{0}}{{\overline{\mathit \Xi}}^{0}}$
$-0.704$ $\pm0.019$ $\pm0.064$ 52k 2
BATLEY
2010B
 
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
LAI
2004A
 
NA48 See BATLEY 2010B
$-0.43$ $\pm0.44$ 87 3
JAMES
1990
 
SPEC FNAL hyperons
1  Based on 10B ${{\mathit J / \psi}}$ events.
2  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.
3  The sign has been changed; see the erratum, JAMES 2002.
References