Jψ production in an equilibrating partonic system Original Research Article

Any color singlet or octet View the MathML source pair is created at short distances and then expands to a full size of View the MathML source. Such a dynamical evolution process is included here in calculations for the View the MathML source number distribution as a function of transverse momentum and rapidity in central AuAu collisions at both RHIC and LHC energies. The View the MathML source pairs are produced in the initial collision and in the partonic system during the prethermal and thermal stages through the partonic channels View the MathML source and View the MathML source, and then they dissociate in the latter two stages. Dissociation of View the MathML source in the medium occurs via two reactions: (a) color singlet View the MathML source plus a gluon turns to color octet View the MathML source, (b) color octet View the MathML source plus a gluon persists as color octet. There are modest yields of View the MathML source in the prethermal stage at RHIC energy and through the reactions View the MathML source at LHC energy for partons with large average momentum in the prethermal stage at both collider energies and in the thermal stage at LHC energy. Production from the partonic system competes with the suppression of the initial yield in the deconfined medium. Consequently, a bulge within −1.5 < y < 1.5 has been found for the View the MathML source number distribution and the ratio of View the MathML source number distribution for AuAu collisions to nucleon-nucleon collisions. This bulge is caused by the partonic system and is thus an indicator of a deconfined partonic medium. Based on this result we suggest the rapidity region worth measuring in future experiments at RHIC and LHC to be −3 < y < 3.