Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay
HyperCP Collaboration: L.C. Lu, R.A. Burnstein, A. Chakravorty, Y.C., Chen, W.-S. Choong, K. Clark, E.C. Dukes, C. Durandet, J. Felix, Y. Fu, G., Gidal, H.R. Gustafson, T. Holmstrom, M. Huang, C. James, C.M. Jenkins, T.D., Jones, D.M. Kaplan, M.J. Longo, W. Luebke, K.-B. Luk
TL;DR
This paper reports the first clear evidence of parity violation in the decay of Omega-minus particles into Lambda and K-minus, based on measurements from the HyperCP experiment at Fermilab.
Contribution
It provides the first unambiguous measurement of a nonzero alpha decay parameter indicating parity violation in this decay channel.
Findings
Measured alpha decay parameter: (1.78 +/- 0.19(stat) +/- 0.16(syst))×10^{-2}
First evidence of parity violation in Omega-minus decay
Supports the understanding of parity violation in hyperon decays
Abstract
The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has been measured from a sample of 4.50 million unpolarized Omega-minus decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/- 0.19(stat) +/- 0.16(syst)]{\times}10^{-2}. This is the first unambiguous evidence for a nonzero alpha decay parameter, and hence parity violation, in the Omega-minus -> Lambda + K-minus decay.
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