Abstract
The paper presents several recent ATLAS results on the analyses of B-meson decays into charmonium states. These include the measurements of B+ mass and the fractions of J/ψ mesons produced in b-hadron decays in pp collisions at $$\sqrt s$$ = 13 TeV in the center of mass system. The measured partial widths and polarizations in B + → J/ψD (*)+ decays and CP-violation parameters in B 0 → J/ψϕ decays in pp collisions at 7 and 8 TeV in the center of mass system are also presented.
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