CP Violation and CKM Phases from Time-dependences of Untagged $B_s$ Decays

Abstract

The $B_s$ system is analyzed in light of a possible width difference $ΔΓ_s$ between its mass eigenstates. If $ΔΓ_s$ is sizable, untagged $B_s$-meson decays may allow a probe of CP violation and moreover the extraction both of the Wolfenstein parameter $η$ and of the notoriously difficult to measure angle $γ$ of the unitarity triangle. To accomplish this ambitious task, time-dependent angular distributions for untagged $B_s$ decays into admixtures of CP eigenstates and channels that are caused by $\bar b\to\bar c u\bar s$ quark-level transitions play a key role. The work described here was done in collaboration with Isard Dunietz.