$Ω^-$ Hyperon Decay Modes with the HyperCP Experiment at Fermilab

Abstract

The HyperCP experiment (Fermilab E871) has the largest recorded sample of $Ω^-$ hyperon decays, allowing new searches for three rare decay modes, each with five charged tracks in the final state. Results are presented for $Ω^-\toΞ^-π^+π^-$; $Ω^- \to Ξ^0(1530)π^-$; and the flavor-changing neutral-current decay $Ω^- \to Ξ^-μ^+μ^-$. Normalization of these measurements were to the decay $Ω^- \to ΛK^-$ with a five-track topology similar to the signal mode with the subsequent decay of $Λ\to p π^-$ and $K^- \to π^- π^+ π^-$ in the decay volume.