Abstract: 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)? decay is observed. Decays into J/??+?? and K+K? are used to reconstruct, respectively, the X(3872) and ?. The ratio of the product of branching fractions B[B0s?X(3872)?]B[X(3872)?J/??+??] to the product B[B0s??(2S)?]B[?(2S)?J/??+??] is measured to be [2.21±0.29(stat)±0.17(syst)]%. The ratio B[B0s?X(3872)?]/B[B0?X(3872)K0] is found to be consistent with one, while the ratio B[B0s?X(3872)?]/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.

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