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.;Capriotti, L.;Couturier, B.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Okamura, S.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
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.File | Dimensione | Formato | |
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2022-AR-32-Constr_on_the_CKM_Angle_gamma_from_Bpm_to_D_hpm-JHEP.pdf
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