Search for time-dependent $CP$ violation in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays

Abstract

A search for time-dependent violation of the charge-parity symmetry in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb${}^{-1}$. The $D^0$ meson is required to originate from a $D^{\ast }(2010{)}^{+}\to D^0{\pi }^{+}$ decay, such that its flavour at production is identified by the charge of the accompanying pion. The slope of the time-dependent asymmetry of the decay rates of $D^0$ and ${\bar{D}}^0$ mesons into the final states under consideration is measured to be $\Delta Y_{K^{+}{K}^{-}}=(-2.3\pm 1.5\pm 0.3)\times 10^{-4}$, $\Delta Y_{{\pi }^{+}{\pi }^{-}}=(-4.0\pm 2.8\pm 0.4)\times 10^{-4}$, where the first uncertainties are statistical and the second are systematic. These results are compatible with the conservation of the charge-parity symmetry at the level of 2 standard deviations and improve the precision by nearly a factor of two.

Updated to match published version; all figures and tables, along with supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-045.html

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