The ratio of the vector to axial-vector coupling constant for ${\Sigma }^{\pm }\to \Lambda e^{\pm }\nu$ decays using 186 events is determined to be -0.37±0.20. The branching ratio for ${\Sigma }^{-}\to \Lambda e^{-}\nu$ is (0.62±0.07) ×${10}^{-4\mathrm{}}$ and for ${\Sigma }^{+}\to \Lambda e^{+}\nu$ is (0.21±0.05)×${10}^{-4\mathrm{}}$. An upper limit on the magnitude of the ratio of the axial-magnetism to axial-vector coupling constants is 3.2.

• Received 14 June 1972

DOI:https://doi.org/10.1103/PhysRevD.6.2417