J/ PRODUCTION IN HIGH-MULTIPLICITY pp AND pA COLLISIONS

Using the Color Glass Condensate (CGC) effective theory and non-relativi-tic QCD (NRQCD) factorization, we provide predictions of J/psi polarization parameters in high-multiplicity proton-proton (pp) and proton-nucleus (pA) collisions. Energies and rapidity ranges are chosen to be accessible at the Large Hadron Collider (LHC). We predict a weak polarization of J/psi that additionally decreases with growing event activities. Small difference between pp and pA collisions is observed.