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

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

$\alpha $ FOR ${{\boldsymbol \Xi}^{0}}$ $\rightarrow$ ${{\boldsymbol \Lambda}}{{\boldsymbol e}^{+}}{{\boldsymbol e}^{-}}$ INSPIRE search

VALUE EVTS DOCUMENT ID TECN  COMMENT
$-0.8$ $\pm0.2$ $397$ $\pm21$ 1
BATLEY
2007C
NA48 ${{\mathit p}}$ Be, 400 GeV
1  This BATLEY 2007C result is consistent with the asymmetry $\alpha $ for ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$ , as expected if the mechanism is internal bremsstrahlung.
  References:
BATLEY 2007C
PL B650 1 First Observation and Branching Fraction and Decay Parameter Measurements of the Weak Radiative Decay ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit e}^{-}}$