Mixing and CP Violation in Charm Meson Decays Page: 6 of 7
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34th International Conference on High Energy Physics, Philadelphia, 2008
The Heavy Flavour Averaging Group (HFAG) has combined a wide range of mixing observables (28 in all) including
all those discussed here. To do this, they made a X2 fit  to obtain values for the underlying mixing parameters
(x, y, q/p ,etc.) that best described these. The results are best summarized in the X2 countour plots in Fig. 2 for
the fit that allowed for CPV. The combined evidence for mixing is now compelling. The probability for x y 0
2 - 05- -r- a- 4
x (%) q/pI
Figure 2: X contours for fit to mixing observables. (a) x vs. y and (b) Iq/p vs. Arg(q/p). This figure is taken from the Heavy
Flavour Averaging Group (HFAG) 
(no mixing) is excluded from a fit with no CPVat the 9.8o- level. The present data are also consistent with the
absence of CPV. No evidence for CPV in time-integrated decay rates for neutral D mesons exists either, though the
measurements are approaching the interesting level of sensitivity that could confront SM estimates. Furthermore,
systematic as well as statistical uncertainties are expected to shrink as more data at present and future flavour
factories is accrued.
We should take this as a need to continue to press on with these studies in case there is yet a hole in the SM at
the energy scale that can be probed with results from a flavour factory.
We are grateful for contributions from our colleagues at CLEO, Belle and CDF for sharing their latest results.
The author wishes to thank BABAR colleagues for providing excellent results and much help in the preparation of
this review. This work was supported by the US National Science Foundation under grant number PHY 0757876.
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Meadows, B & U., /Cincinnati. Mixing and CP Violation in Charm Meson Decays, article, August 26, 2010; [California]. (https://digital.library.unt.edu/ark:/67531/metadc1015050/m1/6/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.