Аннотация:Searches for CP violation in the decays D+(s)→ηπ+ and D+(s)→η′π+ are performed using pp collision data corresponding to 6 fb−1 of integrated luminosity collected by the LHCb experiment. The calibration channels D+(s)→ϕπ+ are used to remove production and detection asymmetries. The resulting CP-violating asymmetries are
ACP(D+→ηπ+)=(0.34±0.66±0.16±0.05)%,
ACP(D+s→ηπ+)=(0.32±0.51±0.12)%,
ACP(D+→η′π+)=(0.49±0.18±0.06±0.05)%,
ACP(D+s→η′π+)=(0.01±0.12±0.08)%,
where the first uncertainty is statistical, the second is systematic and the third, relevant for the D+ channels, is due to the uncertainty on ACP(D+→ϕπ+). These measurements, currently the most precise for three of the four channels considered, are consistent with the absence of CP violation. A combination of these results with previous LHCb measurements is presented.