New Precise Measurements of the $\xilamgam$ and $\xisiggam$ Decay Asymmetries

Abstract

The decay asymmetries of the weak radiative Hyperon decays Xi0 \to Lambda gamma and Xi0 \to Sigma0 gamma have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52000 Xi0 \to Lambda gamma and 15000 Xi0 \to Sigma0 gamma decays, we obtain for the decay asymmetries alpha(Xi0 \to Lambda gamma) = -0.704 +/- 0.019(stat) +/- 0.064(syst) and alpha(Xi0 \to Sigma0 gamma) = -0.729 +/- 0.030(stat) +/- 0.076(syst), respectively. These results are in good agreement with previous experiments, but more precise.

14 pages, 4 figures, accepted for publication in PLB

References in corpus (1)

• Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3)

Cited by in corpus (5)

• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• First simultaneous measurement of ${\Xi }^0$ and ${\bar{\Xi }}^0$ asymmetry parameters in $\psi (3686)$ decay
• Production and decay of polarized hyperon-antihyperon pairs
• Constraining P and CP violation in the main decay of the neutral Sigma hyperon
• Phenomenological study of $J/\psi \to {\Xi }^0(\Lambda {\pi }^0){\bar{\Xi }}^0(\bar{\Lambda }\gamma )$ decays