Tevatron B Working Group
 
Summer 2009 sin(2βs) combination
July 21, 2009
This webpage summarizes the blessed result of combination of D0 and CDF
results on ΔΓs and the CP-violating phase
βsJ/ψφ using 2.8 fb-1 data.
This result is described in this public note
We present 68%, 95% and 99% confidence regions
in the βsJ/ψφ-ΔΓs plane:
Assuming the standard model predictions of
βsJ/ψφ and ΔΓs, the
probability of a deviation as large as the level of the observed data
is 3.4%, corresponding to 2.12 Gaussian standard deviations.
Additionally, we present a confidence
interval of βsJ/ψφ, where
ΔΓs is treated as a nuisance
parameter, and find that βsJ/ψφ is
within [0.27, 0.59] U [0.97, 1.30] at the 68% CL
and within [0.10, 1.42] at 95% CL. In this projection, the p-value for
the Standard Model point is 2.0% or 2.33 Gaussian standard deviations.
Below are all figures meant for download.
- (eps),
(png): Correspondence between likelihood
ratio and confidence level.
- (eps),
(png): Example of adjustment of the
likelihood ratio to expected Gaussian uncertainties.
- (eps),
(png): CDF 2D confidence level contour, input
to combination.
- (eps),
(png): D0 2D confidence level contour,
input to combination.
- (eps),
(png): Combined 2D confidence level contours
in the βsJ/ψφ-ΔΓs
plane.
Text file in format: beta_s(J/psi-phi) [rad], Delta(Gamma_s) [ps-1], log(L)
Root file with 2D histogram
with beta_s(J/psi-phi) [rad], Delta(Gamma_s) [ps-1] on axis and log(L) as
bin content.
- (eps),
(png): Combined 1D likelihood profile for
βsJ/ψφ.
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