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

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

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

INSPIRE   PDGID:

S023AA

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 BATLEY 2010 B NA48 ${{\mathit p}}$ Be, 400 GeV $-0.260$ $\pm0.004$ $\pm0.005$ 300k HANDLER 1982 SPEC FNAL hyperons • • We do not use the following data for averages, fits, limits, etc. • • $-0.317$ $\pm0.027$ 6075 BUNCE 1978 SPEC FNAL hyperons $-0.35$ $\pm0.06$ 505 BALTAY 1974 HBC ${{\mathit K}^{-}}{{\mathit p}}$ 1.75 ${\mathrm {GeV/}}\mathit c$ $-0.28$ $\pm0.06$ 739 DAUBER 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

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