Measurement of the Sigma - magnetic moment using the Sigma --->ne- nu -bar and Sigma --->n pi - decay modes.

Abstract

We have used the spin-precession technique to measure the Σ− magnetic moment (μΣ). A Σ− beam with a polarization of 22% was produced by a 400-GeV proton beam striking a Cu target at nominal production angles of ±3 mrad. We simultaneously recorded 21 000 Σ−→ne−ν¯ decays and 650 000 Σ−→nπ− decays at Σ− beam momenta of 253 and 308 GeV/c. We find μΣ=−1.166±0.014±0.010 nuclear magnetons, where the quoted errors are statistical and systematic, respectively.Received 23 June 1986DOI:https://doi.org/10.1103/PhysRevLett.57.1526©1986 American Physical Society