Search for CP violation in D(s)+→ ^{h+ π0} and D(s)+→ ^h+η decays

Searches for CP violation in the two-body decays D(s)+→h+π0 and D(s)+→h+η (where h ⁺ denotes a π ⁺ or K ⁺ meson) are performed using pp collision data collected by the LHCb experiment corresponding to either 9 fb ⁻¹ or 6 fb ⁻¹ of integrated luminosity. The π ⁰ and η mesons are reconstructed using the e ⁺e ⁻γ final state, which can proceed as three-body decays π ⁰→ e ⁺e ⁻γ and η → e ⁺e ⁻γ, or via the two-body decays π ⁰→ γγ and η → γγ followed by a photon conversion. The measurements are made relative to the control modes D(s)+→KS0h+ to cancel the production and detection asymmetries. The CP asymmetries are measured to beACP(D+→π+π0)=(−1.3±0.9±0.6)%,ACP(D+→K+π0)=(−3.2±4.7±2.1)%,ACP(D+→π+η)=(−0.2±0.8±0.4)%,ACP(D+→K+η)=(−6±10±4)%,ACP(Ds+→K+π0)=(−0.8±3.9±1.2)%,ACP(Ds+→π+η)=(0.8±0.7±0.5)%,ACP(Ds+→K+η)=(0.9±3.7±1.1)%, where the first uncertainties are statistical and the second systematic. These results are consistent with no CP violation and mostly constitute the most precise measurements of A _CP in these decay modes to date. [Figure not available: see fulltext.]