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Evidence for the decays B0 → D(∗)0ϕ and updated measurements of the branching fractions of the Bs0 → D(∗)0ϕ decays

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2023). Evidence for the decays B0 → D(∗)0ϕ and updated measurements of the branching fractions of the Bs0 → D(∗)0ϕ decays. Journal of high energy physics: JHEP, 2023(10): 123. doi:10.1007/JHEP10(2023)123.


Cite as: https://hdl.handle.net/21.11116/0000-000D-F7B3-2
Abstract
Evidence for the decays B0 → D0ϕ 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 be

B(B0 → D0ϕ) = (7.7 ± 2.1 ± 0.7 ± 0.7) × 10−7,
B(B0 → 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 → D0K+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 tan2 δ = (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 to

B(Bs0 → D0ϕ) = (2.30 ± 0.10 ± 0.11 ± 0.20) × 10−5,
B(Bs0 → D∗0ϕ) = (3.17 ± 0.16 ± 0.17 ± 0.27) × 10−5.