Search for CP violation in $$D^{+}_{(s)}\to h^{+} \pi^{0}$$ and $$D^{+}_{(s)}\to h^{+}\eta$$ decays
Searches for CP violation in the two-body decays $$D^{+}_{(s)}\to h^{+} \pi^{0}$$ and $$D^{+}_{(s)}\to h^{+}\eta$$ (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 π0 and η mesons are reconstructed using the e+e–γ final state, which can proceed as three-body decays π0 → e+e–γ and η → e+e–γ, or via the two-body decays π0 → γγ and η → γγ followed by a photon conversion. The measurements are made relative to the control modes $$D^{+}_{(s)}\to K^{0}_{S}h^{+}$$ to cancel the production and detection asymmetries. The CP asymmetries are measured to be ACP(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(D$$^{+}_{s}$$→K+π0)=(–0.8±3.9±1.2)%, ACP(D$$^{+}_{s}$$→π+η)=(0.8±0.7±0.5)%, ACP(D$$^{+}_{s}$$→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 ACP in these decay modes to date.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC). Nuclear Physics (NP)
- Contributing Organization:
- LHCb Collaboration
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1922764
- Report Number(s):
- LA-UR-21-22835
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 6 Vol. 2021; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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