Measurement of $J/\psi$ polarization in $pp$ collisions at $\sqrt{s}=7$ TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +627

An angular analysis of the decay $J/\psi \to {\mu }^{+}{\mu }^{-}$ is performed to measure the polarization of prompt $J/\psi$ mesons produced in $pp$ collisions at $\sqrt{s}=7\; \mathrm{T…