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Paper

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

Abstract

We have studied J/psi production in pp collisions at TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ polarization parameters and were obtained. The study was performed in the kinematic region 2.5<y<4, 2<<8 GeV/, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.