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Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV

CMS Collaboration; Sirunyan, A. M.; CHAUHAN, S.; DUBE, SOURABH; HEGDE, V; KAPOOR, A.; KOTHEKAR, K.; PANDEY, S.; RANE, A.; SHARMA, SEEMA et al. (American Physical Society, 2018-10)

This Letter presents the observation of the rare Z boson decay Z -> psi l(+)l(-). Here, psi represents contributions from direct J/psi and psi(2S) -> J/psi X, l(+)l(-) is a pair of electrons or muons, and the J/psi meson ...

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