Observation of the Z → ψl + l − Decay in pp Collisions at ffiffi s p = 13 TeV
© 2018 CERN, for the CMS Collaboration. This Letter presents the observation of the rare Z boson decay Z→ψ + -. Here, ψ represents contributions from direct J/ψ and ψ(2S)→J/ψX, + - is a pair of electrons or muons, and the J/ψ meson is detected via its decay to μ+μ-. The sample of proton-proton colli...
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