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

Submission Date: 
07/11/2011
Article Information
Submission Form
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.