Quantum mechanical model for J/psi suppression in the LHC era

Abstract

We discuss the interplay of screening, absorption and regeneration effects, on the quantum mechanical evolution of quarkonia states, within a time-dependent harmonic oscillator (THO) model with complex oscillator strength. We compare the results with data for R AA /R AA (CNM) from CERN and RHIC experiments. In the absence of a measurement of cold nuclear matter (CNM) effects at LHC we estimate their role and interpret the recent data from the ALICE experiment. We also discuss the temperature dependence of the real and imaginary parts of the oscillator frequency which stand for screening and absorption/regeneration, respectively. We point out that a structure in the J/ψ suppression pattern for In-In collisions at SPS is possibly related to the recently found X(3872) state in the charmonium spectrum. Theoretical support for this hypothesis comes from the cluster expansion of the plasma Hamiltonian for heavy quarkonia in a strongly correlated medium.

Momentum Dependence of Near-Threshold J/ψ Photoproduction off Nuclei

“…Moreover, nowadays there are charmonium results in pA collisions at initial proton beam energy of 920 GeV from HERA-B experiment at the HERA proton ring of the DESY laboratory [11] and from E866 experiment at FNAL at beam energy of 800 GeV [12]. Various theoretical approaches have been proposed (see, e.g., [1][2][3][4][5][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]) for the description of J/ψ production in pA and AA interactions in the SPS, RHIC and LHC energy domains. The current theoretical and experimental status of the study of charmonium production in high-energy nuclear collisions is given in [33].…”