First Flavor-Tagged Determination of Bounds on CP Violation in Bs &rarr J/&psi &phi Decays
This webpage summarizes the blessed results for the first flavor-tagged determination of bounds
on CP violation in a sample of ~2000 Bs &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 Bs &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 &betas-&Delta&Gamma plane:
Assuming the standard model predictions of 2&betas and delta_gamma, the
probability of a deviation as large as the level of the observed data
is 15%, corresponding to 1.5 Gaussian standard deviations.
Additionally, we present a Feldman-Cousins confidence
interval of 2&betas, where &Delta&Gamma is treated as a nuisance
parameter, and find that 2&betas 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 |&Gamma12| = 0.048 +/- 0.018
in the relation &Delta&Gamma = 2|&Gamma12|*cos(2&betas), we restrict
&betas in [0.24,1.36] U [1.78, 2.90] at the 68% CL.
If we additionally constrain the strong phases &deltaparalel
and &deltaperp
to the results from B0 &rarr J/&psi K*0 decays and the Bs mean width to the world
average Bd width,
we find &betas 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
