J/psi Polarization in pp Collisions at root s=7 TeV

Abelev B., Quintana A. A., Adamova D., Adare A. M., Aggarwal M. M., Rinella G. A., ...More

PHYSICAL REVIEW LETTERS, vol.108, no.8, 2012 (SCI-Expanded) identifier identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 108 Issue: 8
  • Publication Date: 2012
  • Doi Number: 10.1103/physrevlett.108.082001
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Bursa Uludag University Affiliated: No


The ALICE Collaboration has studied J/psi production in pp collisions at root 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.