Abstract
We review the experimental methods to measure mixing and time-dependent CP violation in D0 decays into two hadrons. While these phenomena are usually neglected for D0 → K−π+ decays, this approximation is not always justified. In particular, it produces a bias on the measurement of the parameter yCP, when this is performed by relying on D0 → K−π+ decays as a normalisation channel, whose size is around 40% of the precision of the current world average. Finally, we estimate the sensitivity to the weak mixing phases achievable by studying D0 → K−π+ and untagged D → K−π+ decays, where D stands for either of the D0 and \( \overline{D} \)0 mesons. Contrary to Cabibbo-suppressed D0 → h+h− decays, these decay channels allow to measure these phases without final-state dependent nuisance contributions from the decay amplitudes, but their sensitivity is lower by a factor of six.
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Pajero, T., Morello, M.J. Mixing and CP violation in D0 → K−π+ decays. J. High Energ. Phys. 2022, 162 (2022). https://doi.org/10.1007/JHEP03(2022)162
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DOI: https://doi.org/10.1007/JHEP03(2022)162