$Evidence for the decays B0 → 𝐷(*)0 ϕ and updated measurements of the branching fractions of the 𝐵0𝑠 → 𝐷(*)0 ϕ decays$

Evidence for the decays B0 → 𝐷()0 ϕ and updated measurements of the branching fractions of the 𝐵0𝑠 → 𝐷()0 ϕ decays

Abstract Evidence for the decays B0 → D ¯ $$ \overline{D} $$...

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Bibliographic Details
Main Authors:	Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Afsharnia, H., Agapopoulou, C., Aidala, C. A., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J.
Format:	Article
Language:	English
Published:	Springer Berlin Heidelberg 2023
Online Access:	https://hdl.handle.net/1721.1/152934

Description
Summary:	Abstract Evidence for the decays B0 → D ¯ $$ \overline{D} $$ 0ϕ and B0 → D ¯ $$ \overline{D} $$ *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 $$ \sqrt{s} $$ = 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 B 0 → D ¯ 0 ϕ = 7.7 ± 2.1 ± 0.7 ± 0.7 × 10 − 7 , B B 0 → D ¯ ∗ 0 ϕ = 2.2 ± 0.5 ± 0.2 ± 0.2 × 10 − 6 . $$ {\displaystyle \begin{array}{l}\mathcal{B}\left({B}^0\to {\overline{D}}^0\phi \right)=\left(7.7\pm 2.1\pm 0.7\pm 0.7\right)\times {10}^{-7},\\ {}\mathcal{B}\left({B}^0\to {\overline{D}}^{\ast 0}\phi \right)=\left(2.2\pm 0.5\pm 0.2\pm 0.2\right)\times {10}^{-6}.\end{array}} $$ In these results, the first uncertainty is statistical, the second systematic, and the third is related to the branching fraction of the B0 → D ¯ $$ \overline{D} $$ 0K+K− decay, used for normalisation. By combining the branching fractions of the decays B0 → D ¯ ∗ 0 ϕ $$ {\overline{D}}^{\left(\ast \right)0}\phi $$ and B0 → D ¯ ∗ 0 ω $$ {\overline{D}}^{\left(\ast \right)0}\omega $$ , 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 B s 0 $$ {B}_s^0 $$ → D ¯ ∗ 0 ϕ $$ {\overline{D}}^{\left(\ast \right)0}\phi $$ decays, which can be used to determine the CKM angle γ, leads to B B s 0 → D ¯ 0 ϕ = 2.30 ± 0.10 ± 0.11 ± 0.20 × 10 − 5 , B B s 0 → D ¯ ∗ 0 ϕ = 3.17 ± 0.16 ± 0.17 ± 0.27 × 10 − 5 . $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({B}_s^0\to {\overline{D}}^0\phi \right)=\left(2.30\pm 0.10\pm 0.11\pm 0.20\right)\times {10}^{-5},\\ {}\mathcal{B}\left({B}_s^0\to {\overline{D}}^{\ast 0}\phi \right)=\left(3.17\pm 0.16\pm 0.17\pm 0.27\right)\times {10}^{-5}.\end{array}} $$