Antiproton lifetime measurement in the ice storage ring using a counter technique

Abstract Results are presented of the search for an antiproton decay into an electron and a neutral pion. Using a stacking scheme based on stochastic cooling an average of 7000 antiprotons was accumulated and stored in the ICE ring for 10 days. No experimental evidence for such an antiproton decay was found. The following lower limit for the antiproton lifetime has been established in the antiproton rest frame: τ > BR × 1700 h at 90% confidence level (CL), where BR is the branching ratio for this decay channel.