T Aaltonen, J Adelman, T Akimoto, MG Albrow… - Physical review …, 2008 - APS

This Letter describes the first determination of bounds on the C P-violation parameter 2 β s

using B s 0 decays in which the flavor of the bottom meson at production is identified. The

result is based on approximately 2000 B s 0→ J/ψ ϕ decays reconstructed in a 1.35 fb− 1 …