People working on this:
Marco Gersabeck
Notation:
This combination uses measurements of direct and indirect CP violation
to extract the level of agreement for a no-CP-violation hypothesis.
The observables are:
Year
Experiment
Results
Δ〈t〉/τ
〈t〉/τ
Comment
Reference
2007
Belle
AΓ = (0.01 ±0.30 (stat.) ±0.15 (syst.))%
-
-
540 fb−1 near Υ(4S) resonance
M. Staric et al. (Belle Collab.), Phys. Rev. Lett. 98, 211803 (2007).
2008
BaBar
AΓ = (0.26 ±0.36 (stat.) ±0.08 (syst.))%
-
-
384 fb−1 near Υ(4S) resonance
B. Aubert et al. (BaBar Collab.), Phys. Rev. D 78, 011105(R) (2008).
2011
LHCb
AΓ = (−0.59 ±0.59 (stat.) ±0.21 (syst.))%
-
-
28 pb−1 √ s = 7 TeV pp collisions
R. Aaij et al. (LHCb Collab.), arXiv:1112.4698 (submitted to JHEP).
2008
BaBar
ACP(KK) = (0.00 ±0.34 (stat.) ±0.13 (syst.))%
ACP(ππ) = (−0.24 ±0.52 (stat.) ±0.22 (syst.))%
0.00
1.00
385.8 fb−1 near Υ(4S) resonance
B. Aubert et al. (BABAR Collab.), Phys. Rev. Lett. 100, 061803 (2008).
2008
Belle
ΔACP = (−0.86 ±0.60 (stat.) ±0.07 (syst.))%
0.00
1.00
540 fb−1 near Υ(4S) resonance
M. Staric et al. (BELLE Collab.), Phys. Lett. B 670, 190 2008).
2011
LHCb
ΔACP = (−0.82 ±0.21 (stat.) ±0.11 (syst.))%
0.10
2.08
0.62 fb−1 √ s = 7 TeV pp collisions
R. Aaij et al. (LHCb Collab.), arXiv:1112.0938 (accepted by PRL).
2012
CDF Prelim.
ΔACP = (−0.62 ±0.21 (stat.) ±0.10 (syst.))%
0.25
2.58
9.7 fb−1
√ s =
1.96 TeV p p collisions
The CDF Collaboration, CDF Note 10784.
Fit Result
Agreement with no CP violation
CL = 6.1x10−5
Combination Plot: The combination plot shows the measurements listed in the table above for ΔACP and AΓ, where the bands represent ±1σ intervals. The point of no CP violation (0,0) is shown as a filled circle, and two-dimensional 68% CL, 95% CL, and 99.7% CL regions are plotted as ellipses with the best fit value as a cross indicating the one-dimensional uncertainties in their center.
From the fit, the change in χ2 from the minimum value for the no-CPV point (0,0) is 19.4; this corresponds to a CL of 6.1x10−5 for two degrees of freedom. Thus the data is consistent with no CP violation at 0.006% CL. The central values and ± 1σ errors for the individual parameters are: