New Precise Measurements of the $\xi^0 -> \Lamga \gamma$ and $\xi^0 -> \Sigma^0 \gamma$ Decay Asymmetries - INSPIRE

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New Precise Measurements of the \xi^0 -> \Lamga \gamma and $\xi^0 -> \Sigma^0 \gamma$ Decay Asymmetries

2010

14 pages

Published in:

Phys.Lett.B 693 (2010) 241-248

e-Print:

1009.3844 [hep-ex]

DOI:

10.1016/j.physletb.2010.08.046

PDG:

\alpha\mathrm {({{\mathit \Xi}^{0}})}

\alpha _{−}({{\mathit \Lambda}})

Report number:

CERN-PH-EP-2010-032

Experiments:

CERN-NA-048

View in:

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Abstract: (Elsevier)

The decay asymmetries of the weak radiative hyperon decays Ξ 0 → Λ γ and Ξ 0 → Σ 0 γ have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52 000 Ξ 0 → Λ γ and 15 000 Ξ 0 → Σ 0 γ decays, we obtain for the decay asymmetries α Ξ 0 → Λ γ = − 0.704 ± 0.019 stat ± 0.064 syst and α Ξ 0 → Σ 0 γ = − 0.729 ± 0.030 stat ± 0.076 syst , respectively. These results are in good agreement with previous experiments, but more precise.

Note:

Long author list - awaiting processing

Hyperon
Decay asymmetry
decay: asymmetry: measured
Xi0: radiative decay
CERN SPS
NA48
neutral particle: secondary beam
angular dependence
experimental results
Xi0 --> Lambda photon

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