Abstract
The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 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/ψ polarization parameters λ(θ) and λ(φ) were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p(t)<8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
Highlights
TeV at the LHC through its muon pair decay
Results obtained for charmonium production at the Tevatron collider in the 1990s [2] led theory to recognize the role of intermediate quark-antiquark color-octet states in the production process, in the framework of the nonrelativistic quantum chromodynamics (QCD)
This approach brought the calculations of pt spectra to agree rather well with the data [4]
Summary
The polar and azimuthal angle distributions of the decay muons were measured, and results on the J=c polarization parameters and were obtained. The distributions of the angular variables for the J=c decay products were obtained starting from the study of the dimuon invariant mass spectra.
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