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• #### Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at √s=7 TeV ﻿

(2013)
The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton–proton collisions at √s=7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 ...