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

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

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

INSPIRE   PDGID:

S023AG

See the note above on ``Radiative Hyperon Decays.''

VALUE EVTS DOCUMENT ID TECN  COMMENT $\bf{ -0.69 \pm0.06}$ OUR AVERAGE $-0.729$ $\pm0.030$ $\pm0.076$ 15k 1 BATLEY 2010 B NA48 ${{\mathit p}}$ Be, 400 GeV $-0.63$ $\pm0.08$ $\pm0.05$ 4045 ALAVI-HARATI 2001 C KTEV ${{\mathit p}}$ nucleus, 800 GeV • • We do not use the following data for averages, fits, limits, etc. • • $+0.20$ $\pm0.32$ $\pm0.05$ 85 2 TEIGE 1989 SPEC FNAL hyperons 1  BATLEY 2010B also measured the ${{\overline{\mathit \Xi}}^{0}}$ $\rightarrow$ ${{\overline{\mathit \Sigma}}^{0}}{{\mathit \gamma}}$ asymmetry to be $-0.786$ $\pm0.104$ (no systematic error given) with 1404 events. 2  This result has been withdrawn, due to an error. See the erratum, TEIGE 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 ALAVI-HARATI 2001C PRL 86 3239 Measurement of the Branching Ratio and Asymmetry of the Decay ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$ TEIGE 1989 PRL 63 2717 Measurement of the ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$ Branching Ratio and Asymmetry Parameter

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