Observation of ψ (3686) →e+e-χcJ and χcJ →e+e-J /ψ3686Þ → eþe−χc
J and χc
J → eþe−
J=ψ, where
J ¼ 0, 1, 2. The decays ψð3686Þ → eþe−χc
J and χc
J → eþe−
J Study of the B + c → J /ψ D + s and B + c → J /ψ D ∗+ s decays with the ATLAS detectorThe decays Bc+→
J/ψDs+ and Bc+→
J/ψDs∗+ are studied with the ATLAS detector at the LHC using a