This webpage summarizes the blessed results for the first flavor-tagged determination of bounds
on CP violation in a sample of ~2000 B_{s} &rarr J/&psi &phi decays corresponding
to 1.35 fb^{-1} data.

See also the results on the
Lifetime difference and CP violating phase in *B _{s} &rarr J/&psi &phi* decays

Details on this analysis can be found in arXiv:0712.2397 submitted to PRL.

Copy of Wine & Cheese talk by Karen Gibson
as well as Video of Wine & Cheese talk.

Information on how to include this result for a Combination in Global Fits

We use a Feldman-Cousins technique to determine 68% CL and 95% CL regions
in the &beta_{s}-&Delta&Gamma plane:

Additionally, we present a Feldman-Cousins confidence
interval of 2&beta_{s}, where &Delta&Gamma is treated as a nuisance
parameter, and find that 2&beta_{s} is within [0.32, 2.82] at the 68% CL.

We also exploit current experimental and theoretical information to
extract tighter Feldman-Cousins bounds on the CP-violating
phase. By applying the constraint |&Gamma_{12}| = 0.048 +/- 0.018
in the relation &Delta&Gamma = 2|&Gamma_{12}|*cos(2&beta_{s}), we restrict
&beta_{s} in [0.24,1.36] U [1.78, 2.90] at the 68% CL.

If we additionally constrain the strong phases &delta_{paralel}
and &delta_{perp}
to the results from B^{0} &rarr J/&psi K^{*0} decays and the B_{s} mean width to the world
average B_{d} width,
we find &beta_{s} in [0.40, 1.20] at 68% CL

Below are all figures meant for download.

- (eps), (png): Bs invariant mass distribution.
- (eps), (png): Same side tag predicted dilution
- (eps), (png): Opposite side tag predicted dilution
- (eps), (png): Opposite side tag measured vs. predicted dilution in B+/- decays.
- (eps), (png): Opposite side tag measured vs. predicted dilution in B+ decays.
- (eps), (png): Opposite side tag measured vs. predicted dilution in B- decays.
- (eps), (png): Phi angular distribution.
- (eps), (png): cos(Theta) angular distribution.
- (eps), (png): cos(Phi) angular distribution.
- (eps), (png): 2D likelihood profiles asumming +/- 20% dilution asymmtery
- (eps), (png): 2D likelihood profile with phi_para in (pi, 2pi)
- (eps), (png): 2D likelihood profile with phi_para in (0, pi)
- (eps), (png): 2D likelihood profile
- (eps), (png): 2D likelihood profile with strong phases constrained to numbers obtained by B factories in B0 -> J/Psi K*0
- (eps), (png): 2D likelihood profile with lifetime constrained to B0 PDG lifetime
- (eps), (png): 2D likelihood profile with both phases and lifetime constrained
- (eps), (png): 2D Feldman-Cousins confidence regions with phi_para in (pi, 2pi)
- (eps), (png): 2D Feldman-Cousins confidence regions with phi_para in (0, pi)
- (eps), (png): 2D Feldman-Cousins confidence regions