Small-pT Production of Polarised J/ψ Mesons within the Soft Gluon Resummation Approach

In this work we use the Soft Gluon Resummation approach as a noncollinear factorization model to describe polarisation of $$J{\text{/}}\psi $$ within NRQCD as a hadronization model. We extract nonperturbative LDME for octet color states of charmonium by fitting them to unpolarised $$J{\text{/}}\psi $$ production data of PHENIX and STAR collaborations at $$\sqrt s = 200$$ GeV. We make prediction for an angular coefficient $$\lambda $$ as a polarisation indicator for $$J{\text{/}}\psi $$ in the helicity frame and compare it with the PHENIX polarisation data.