A Measurement of the Branching Ratio and Asymmetry of the Decay Cascade^0-->Sigma^0/gamma

Abstract

We have studied the rare weak radiative hyperon decay Cascade0-->Sigma0/gamma in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Cascade0-->Lambda/pi0 decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio of BR(Cascade0-->Sigma0/gamma)=(3.34 +/- 0.05 +/- 0.09) x 10^(-3). By analyzing the final state decay distributions, we have also determined that the Sigma0 emission asymmetry parameter for this decay is alpha = -0.63 +/- 0.09.

submitted to Physical Review Letters

References in corpus (1)

• Chiral Approach to Weak Radiative Hyperon Decays and the ${\Xi }^0-->\Lambda \gamma$ Asymmetry

Cited by in corpus (6)

• Parity Violating Photoproduction of ${\pi }^{\pm }$ on the $\Delta$ Resonance
• Electroweak Radiative Corrections to Parity-Violating Electroexcitation of the $\Delta$
• Production and decay of polarized hyperon-antihyperon pairs
• Precision Measurement of the Decay ${\Sigma }^{+}\to p\gamma$ in the Process $J/\psi \to {\Sigma }^{+}{\bar{\Sigma }}^{-}$
• New Precise Measurements of the $\xilamgam$ and $\xisiggam$ Decay Asymmetries
• ${\Omega }^{-}$ Hyperon Decay Modes with the HyperCP Experiment at Fermilab