Measurements of indirect CP asymmetries in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays

Abstract

A study of indirect CP violation in $D^0$ mesons through the determination of the parameter $A_{\Gamma }$ is presented using a data sample of $pp$ collisions, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$, collected with the LHCb detector and recorded at the centre-of-mass energy of 7 TeV at the LHC. The parameter $A_{\Gamma }$ is the asymmetry of the effective lifetimes measured in decays of $D^0$ and ${\bar{D}}^0$ mesons to the CP eigenstates $K^{-}{K}^{+}$ and ${\pi }^{-}{\pi }^{+}$. Fits to the data sample yield $A_{\Gamma }(KK)=(-0.35\pm 0.62\pm 0.12)\times 10^{-3}$ and $A_{\Gamma }(\pi \pi )=(0.33\pm 1.06\pm 0.14)\times 10^{-3}$, where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in $A_{\Gamma }$ between the two final states and no indication of CP violation.

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Cited by in corpus (27)

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