A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb^−1 is used to measure eleven CP violation observables in B± → D h± decays, where h is either a kaon or a pion. The neutral D meson decay is reconstructed in the three-body final states: K± π∓ π0; π+ π− π0; K+ K− π0 and the suppressed π± K∓ π0 combination. The mode where a large CP asymmetry is expected, B± → [π± K∓ π0]_D K±, is observed with a significance greater than seven standard deviations. The ratio of the partial width of this mode relative to that of the favoured mode, B± → [K± π∓ π0]_D K±, is R_ADS(K) = (1.27 ± 0.16 ± 0.02) × 10^−2. Evidence for a large CP asymmetry is also seen: A_ADS(K) = −0.38 ± 0.12 ± 0.02. Constraints on the CKM angle γ are calculated from the eleven reported observables.
Constraints on the CKM Angle γ from B± → D h± Decays Using D → h± h′∓ π0 Final States
Calabrese, R.Membro del Collaboration Group
;Capriotti, L.Membro del Collaboration Group
;Fiorini, M.Membro del Collaboration Group
;Franzoso, E.Membro del Collaboration Group
;Giugliano, C.Membro del Collaboration Group
;Guarise, M.Membro del Collaboration Group
;Luppi, E.Membro del Collaboration Group
;Okamura, S.Membro del Collaboration Group
;Pappalardo, L. L.Membro del Collaboration Group
;Tomassetti, L.Membro del Collaboration Group
;
2022
Abstract
A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb^−1 is used to measure eleven CP violation observables in B± → D h± decays, where h is either a kaon or a pion. The neutral D meson decay is reconstructed in the three-body final states: K± π∓ π0; π+ π− π0; K+ K− π0 and the suppressed π± K∓ π0 combination. The mode where a large CP asymmetry is expected, B± → [π± K∓ π0]_D K±, is observed with a significance greater than seven standard deviations. The ratio of the partial width of this mode relative to that of the favoured mode, B± → [K± π∓ π0]_D K±, is R_ADS(K) = (1.27 ± 0.16 ± 0.02) × 10^−2. Evidence for a large CP asymmetry is also seen: A_ADS(K) = −0.38 ± 0.12 ± 0.02. Constraints on the CKM angle γ are calculated from the eleven reported observables.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.