Observation of the B_{s}
Phys Rev Lett
; 125(15): 152001, 2020 Oct 09.
Article
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| MEDLINE
| ID: mdl-33095627
ABSTRACT
Using a data sample of proton-proton collisions at sqrt[s]=13 TeV, corresponding to an integrated luminosity of 140 fb^{-1} collected by the CMS experiment in 2016-2018, the B_{s}^{0}âX(3872)Ï decay is observed. Decays into J/ψπ^{+}π^{-} and K^{+}K^{-} are used to reconstruct, respectively, the X(3872) and Ï. The ratio of the product of branching fractions B[B_{s}^{0}âX(3872)Ï]B[X(3872)âJ/ψπ^{+}π^{-}] to the product B[B_{s}^{0}âψ(2S)Ï]B[ψ(2S)âJ/ψπ^{+}π^{-}] is measured to be [2.21±0.29(stat)±0.17(syst)]%. The ratio B[B_{s}^{0}âX(3872)Ï]/B[B^{0}âX(3872)K^{0}] is found to be consistent with one, while the ratio B[B_{s}^{0}âX(3872)Ï]/B[B^{+}âX(3872)K^{+}] is two times smaller. This suggests a difference in the production dynamics of the X(3872) in B^{0} and B_{s}^{0} meson decays compared to B^{+}. The reported observation may shed new light on the nature of the X(3872) particle.
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