Measurement of the CP violation parameter $A_{\Gamma}$ in $D^{0} \rightarrow K^{+}K^{-}$ and $D^{0} \rightarrow \pi^{+} \pi^{-}$ decays

Abstract.

Asymmetries in the time-dependent rates of singly Cabibbo-suppressed $D^{0}\rightarrow K^{+}K^{-}$ and $D^{0}\rightarrow \pi^{+}\pi^{-}$ decays are measured in pp collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of 3 fb^-1. The asymmetries in effective decay widths between D⁰ and $\overline{D}^{0}$ decays, sensitive to indirect CP violation, are measured. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two.