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Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
Аннотация:Using a data sample of proton-proton collisions at s√= 13 TeV, corresponding to an integrated luminosity of 140 fb−1 collected by the CMS experiment in 2016-2018, the B0s → X(3872)ϕ decay is observed. Decays into J/ψπ+π− and K+K− are used to reconstruct, respectively, the X(3872) and ϕ. The ratio of the product of branching fractions B(B0s → X(3872)ϕ)B(X(3872) → J/ψπ+π−) to the product B(B0s → ψ(2S)ϕ)B(ψ(2S) → J/ψπ+π−) is measured to be (2.21 ± 0.29 (stat) ± 0.17 (syst))%. The ratio B(B0s → X(3872)ϕ)/B(B0 → X(3872)K0) is found to be consistent with one, while the ratio B(B0s → X(3872)ϕ)/B(B+ → X(3872)K+) is two times smaller. This suggests a difference in the production dynamics of the X(3872) in B0 and B0s meson decays compared to B+. The reported observation may shed new light on the nature of the X(3872) particle.