# J/psi polarization in pp collisions at sqrt(s)=7 TeV

Submission Date:
07/11/2011
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Article Information
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System:
p-p
Energy:
7 TeV
Abstract Plain Text:

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. In both frames, the polarization parameters are compatible with zero, within uncertainties.