Constraints on the CKM angle γ from B ± → Dh ± decays using D → h ± h′ π 0 final states

The LHCb collaboration

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Resum

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±→ Dh± decays, where h is either a kaon or a pion. The neutral D meson decay is reconstructed in the three-body final states: K±ππ0; π+ππ0; K+Kπ0 and the suppressed π±Kπ0 combination. The mode where a large CP asymmetry is expected, B±→ [π±Kπ0]DK±, 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±ππ0]DK±, is RADS(K) = (1.27 ± 0.16 ± 0.02) × 10−2. Evidence for a large CP asymmetry is also seen: AADS(K) = −0.38 ± 0.12 ± 0.02. Constraints on the CKM angle γ are calculated from the eleven reported observables. [Figure not available: see fulltext.]

Idioma originalAnglès
Número d’article99
RevistaJournal of High Energy Physics
Volum2022
Número7
DOIs
Estat de la publicacióPublicada - de jul. 2022

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