Evidence for the decays B 0 → D ¯ (*)0 ϕ and updated measurements of the branching fractions of the B s 0 → D ¯ (*)0 ϕ decays

Journal article

Evidence for the decays B0→D¯0ϕ and B0→D¯*0ϕ is reported with a significance of 3.6 σ and 4.3 σ, respectively. The analysis employs pp collision data at centre-of-mass energies s = 7, 8 and 13 TeV collected by the LHCb detector and corresponding to an integrated luminosity of 9 fb−1. The branching fractions are measured to beBB0→D¯0ϕ=7.7±2.1±0.7±0.7×10−7, BB0→D¯∗0ϕ=2.2±0.5±0.2±0.2×10−6. In these results, the first uncertainty is statistical, the second systematic, and the third is related to the branching fraction of the B0→D¯0K+K− decay, used for normalisation. By combining the branching fractions of the decays B0 → D¯∗0ϕ and B0 → D¯∗0ω, the ω-ϕ mixing angle δ is constrained to be tan2δ = (3.6 ± 0.7 ± 0.4) × 10−3, where the first uncertainty is statistical and the second systematic. An updated measurement of the branching fractions of the Bs0 → D¯∗0ϕ decays, which can be used to determine the CKM angle γ, leads toBBs0→D¯0ϕ=2.30±0.10±0.11±0.20×10−5, BBs0→D¯∗0ϕ=3.17±0.16±0.17±0.27×10−5.

Authors: Aaij, R; Abdelmotteleb, ASW; Abellan Beteta, C; Abudinén, F; Ackernley, T

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2023
• Issue: 10
• Pages: 123
• Article number: 123
• Publication date: 2023-10-20
• Acceptance date: 2023-09-28
• DOI: 10.1007/jhep10(2023)123
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: B Physics; CKM Angle Gamma; Branching fraction; Hadron-Hadron Scattering