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Paper

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

Abstract

An angular analysis of the decay is performed to measure the polarization of prompt mesons produced in collisions at . The dataset corresponds to an integrated luminosity of 0.37 fb collected with the LHCb detector. The measurement is presented as a function of transverse momentum, , and rapidity, , of the meson, in the kinematic region and .