The first observation of the B 0 s → η ′ η ′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb − 1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [ 3.31 ± 0.64 ( stat ) ± 0.28 ( syst ) ± 0.12 ( norm ) ] × 10 − 5 , where the third uncertainty comes from the B ± → η ′ K ± branching fraction that is used as a normalization. In addition, the charge asymmetries of B ± → η ′ K ± and B ± → ϕ K ± , which are control channels, are measured to be ( − 0.2 ± 1.3 ) % and ( + 1.7 ± 1.3 ) % , respectively. All results are consistent with theoretical expectations
The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of pr...
The first observation of the decay B0s → χc1 ϕ and a study of B0 → χc1,2 K⁎0 decays are presented. T...
The first observation of the decay B0s→χc1φ and a study of B0→χc1,2K∗0 decays are presented. The ana...
The first observation of the B 0 s → η ′ η ′ decay is reported. The study is based on a sample of pr...
The first observation of the B0s → η′ η′ decay is reported. The study is based on a sample of proton...
The first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-pr...
The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of pr...
See paper for full list of authorsInternational audienceThe first observation of the B0s→η′η′ decay ...
The first observation of the B(s)(0)→η'η' decay is reported. The study is based on a sample of proto...
The first observation of the B0 s → η0 η0 decay is reported. The study is based on a sample of pro...
The first observation of the B[s over 0] → η[superscript ′]η[superscript ′] decay is reported. The s...
The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of pr...
The first observation of the decay B0s → χc1 ϕ and a study of B0 → χc1,2 K⁎0 decays are presented. T...
The first observation of the decay B0s→χc1φ and a study of B0→χc1,2K∗0 decays are presented. The ana...
The first observation of the B 0 s → η ′ η ′ decay is reported. The study is based on a sample of pr...
The first observation of the B0s → η′ η′ decay is reported. The study is based on a sample of proton...
The first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-pr...
The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of pr...
See paper for full list of authorsInternational audienceThe first observation of the B0s→η′η′ decay ...
The first observation of the B(s)(0)→η'η' decay is reported. The study is based on a sample of proto...
The first observation of the B0 s → η0 η0 decay is reported. The study is based on a sample of pro...
The first observation of the B[s over 0] → η[superscript ′]η[superscript ′] decay is reported. The s...
The first observation of the B s 0 → η ′ η ′ decay is reported. The study is based on a sample of pr...
The first observation of the decay B0s → χc1 ϕ and a study of B0 → χc1,2 K⁎0 decays are presented. T...
The first observation of the decay B0s→χc1φ and a study of B0→χc1,2K∗0 decays are presented. The ana...