Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay
/ Authors
L. Lu, R. Burnstein, A. Chakravorty, Y. C. Chen, W. Choong, K. Clark, E. Dukes, C. Durandet, J. Félix, Y. Fu
and 20 more authors
G. Gidal, H. Gustafson, T. Holmstrom, M. Huang, C. James, C. Jenkins, T. Jones, D. Kaplan, M. Longo, W. Luebke, K. Luk, K. Nelson, H. K. Park, J. Perroud, D. Rajaram, H. Rubin, J. Volk, C. White, S. White, P. Żyła
/ 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.
Journal: Physics Letters B