# Measurement of the difference of time-integrated CP asymmetries in $D^0 \rightarrow K^{-} K^{+}$ and $D^0 \rightarrow \pi^{-} \pi^{+}$ decays

Abstract : A search for CP violation in $D^0 \rightarrow K^{-} K^{+}$ and $D^0 \rightarrow \pi^{-} \pi^{+}$ decays is performed using $pp$ collision data, corresponding to an integrated luminosity of $3~fb^{-1}$, collected using the LHCb detector at centre-of-mass energies of 7 and $8~$TeV. The flavour of the charm meson is inferred from the charge of the pion in $D^{*+}\rightarrow D^0\pi^+$ and $D^{*-}\rightarrow \bar{D^0}\pi^{-}$ decays. The difference between the CP asymmetries in $D^0 \rightarrow K^{-} K^{+}$ and $D^0 \rightarrow \pi^{-} \pi^{+}$ decays, $\Delta A_{CP} \equiv A_{CP}(K^{-} K^{+}) - A_{CP}(\pi^{-} \pi^{+})$, is measured to be $\left( -0.10 \pm 0.08(stat) \pm 0.03(syst) \right) \%$. This is the most precise measurement of a time-integrated CP asymmetry in the charm sector from a single experiment.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01272017
Contributor : Sabine Starita <>
Submitted on : Wednesday, February 10, 2016 - 9:11:42 AM
Last modification on : Wednesday, January 6, 2021 - 6:22:03 PM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, F. Fleuret, O. Kochebina, et al.. Measurement of the difference of time-integrated CP asymmetries in $D^0 \rightarrow K^{-} K^{+}$ and $D^0 \rightarrow \pi^{-} \pi^{+}$ decays. Physical Review Letters, American Physical Society, 2016, 116, pp.191601 ⟨10.1103/PhysRevLett.116.191601⟩. ⟨in2p3-01272017⟩

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