https://doi.org/10.1140/epjc/s10052-011-1789-9
Regular Article - Theoretical Physics
Effective lifetimes of B
s
decays and their constraints on the 
–
mixing parameters
Nikhef, Science Park 105, 1098 XG, Amsterdam, The Netherlands
* e-mail: Robert.Fleischer@nikhef.nl
Received:
26
September
2011
Published online:
3
November
2011
Measurements of the effective lifetimes of B
s
-meson decays, which only require untagged rate analyses, allow us to probe the width difference ΔΓ
s
and the CP-violating phase ϕ
s
of 
–
mixing. We point out that the dependence of the effective lifetime on non-linear terms in ΔΓ
s
allows for a determination of ϕ
s
and ΔΓ
s
given a pair of B
s
decays into CP-even and CP-odd final states. Using recent lifetime measurements of 
and 
decays, we illustrate this method and show how it complements the constraints in the ϕ
s
–ΔΓ
s
plane from other observables.
© Springer-Verlag / Società Italiana di Fisica, 2011
