Polarization and spin transfer of Ω− and Ξ− hyperons at 800 GeV

Fermilab experiment E756 has measured the polarization of W− hyperons produced by 800 GeV protons to be small compared to that of Ξ− hyperons. When produced by a neutral beam containing polarized Λ and Ξ0 hyperons, both the Ω− and the Ξ− have a significant polarization indicating a large spin transfer at high energies.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87380/2/80_1.pd

Search for the Proton Decay Mode proton to neutrino K+ in Soudan 2

We have searched for the proton decay mode proton to neutrino K+ using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kiloton-year fiducial exposure through June 1997 are examined for occurrence of a visible K+ track which decays at rest into mu+ nu or pi+ pi0. We found one candidate event consistent with background, yielding a limit, tau/B > 4.3 10^{31} years at 90% CL with no background subtraction.Comment: 13 pages, Latex, 3 tables and 3 figures, Accepted by Physics Letters

A preliminary measurement of the Ξ0→Σ0γ branching ratio and asymmetry parameter

In an experiment performed at Fermilab, we have observed the weak radiative decay Ξ0→Σ0γ. From a sample of 85±10 events we have preliminary measurement of the decay branching ratio Γ(Ξ0→Σ0γ)/Γ(Ξ0→ Λπ0)=(3.56±0.42)×10−3 and the asymmetry parameter αΞ=0.20±0.28.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87374/2/440_1.pd