delta S = 2 nonleptonic hyperon decays
  A sensitive search for the rare decays \Omega^- \to \Lambda \pi^- and \Xi^0 \to p \pi^- has been performed using data from the 1997 run of the HyperCP (Fermilab E871) experiment. Limits on other such processes do not exclude the possibility of observable rates for |\Delta S| = 2 nonleptonic hyperon decays, provided the decays occur through parity-odd operators. We obtain the branching-fraction limits B(\Omega^- \to \Lambda \pi^-)< 2.9 x 10^{-6} and B(\Xi^0 \to p \pi^-)< 8.2 x 10^{-6}, both at 90% confidence level. 
C. G. White, R. A. Burnstein, A. Chakravorty, A. Chan, Y. C. Chen, W.   S. Choong, K. Clark, E. C. Dukes, C. Durandet, J. Fe...