| Abstract: | The ALICE Collaboration has studied J/psi production in pp collisions at
sqrt(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/psi
polarization parameters lambda_theta and lambda_phi 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. The results for lambda_theta in the
helicity frame show a longitudinal polarization at low p_t, vanishing with
increasing transverse momentum. All the other polarization parameters are
consistent with zero, within uncertainties. |
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