Open Charm Production in $p + p$ and Pb + Pb collisions at the CERN Large Hadron Collider

Effects of strong longitudinal colour electric fields (SCF), shadowing, and quenching on the open prompt charm mesons (D 0 , D + , D ∗+ , Ds + ) production in central Pb + Pb collisions at √ sNN = 2.76 TeV are investigated within the framework of the HIJING/B¯ B v2.0 model. We compute the nuclear modification factor R D , and show that the above nuclear effects constitute important dynamical mechanisms in the description of experimental data. The strength of colour fields (as characterized by the string tension �), partonic energy loss and jet quenching process lead to a suppression factor consistent with recent published data. Predictions for future beauty mesons measurements have been included. Ratios of strange to non-strange prompt charm mesons in central Pb + Pb and minimum bias (MB) p+p collisions at 2.76 TeV are also discussed. Minimum bias p + p collisions which constitute theoretical baseline in our calculations are studied at the