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 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)+→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 ACP in these decay modes to date. [Figure not available: see fulltext.] © 2021, The Author(s).
Search for CP violation in D(s)+→h+π0 and D(s)+→h+η decays
De Serio, M.;Pappagallo, M.;Simone, S.;
2021-01-01
Abstract
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 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)+→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 ACP in these decay modes to date. [Figure not available: see fulltext.] © 2021, The Author(s).File | Dimensione | Formato | |
---|---|---|---|
Aaij2021_Article_SearchForCPViolationInDsHΠ0DST.pdf
accesso aperto
Tipologia:
Documento in Versione Editoriale
Licenza:
Creative commons
Dimensione
903.17 kB
Formato
Adobe PDF
|
903.17 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.