New Determination of the Masses of Σ- and Σ0 Hyperons Burnstein, R. A. ; Day, T. B. ; Kehoe, B. ; Sechi-Zorn, B. ; Snow, G. A. Abstract Publication: Physical Review Letters Pub Date: July 1964 DOI: 10.1103/PhysRevLett.13.66 Bibcode: 1964PhRvL..13...66B