ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1994, vol. 323, p. 219-226
Study of the decay Λc +→λl+νl
Using the CLEO II detector at CESR we observe 500 Λl+ pairs consistent with the semileptonic decay Λc + → λ+ν We measure σ(e+e- → Λ+ cX) · B(Λ+ c → Λl+νl) = 4.77±0.25±0.66 pb. Combining with the charm semileptonic width and the lifetime of the Λc we also obtain B(Λ+ c → pK-π+). We find no evidence for Λl+νl final states in which there are additional Λ+ c decay products. We measure the decay asymmetry parameter of Λ+ c → Λe+νe to be αΛc = -0.89+0.17+0.09 -0.11-0.05. © 1994.