Wednesday, June 5, 2013

1306.0885 (V. Topor Pop et al.)

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

V. Topor Pop, M. Gyulassy, J. Barrette, C. Gale, M. Petrovici
Effects of strong longitudinal colour electric fields (SCF), shadowing and quenching on the open prompt charm mesons (D$^0$, D$^+$, D$^{*+}$, D${_s}{^+}$) production in central Pb + Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV are investigated within the framework of the {\small HIJING/B\=B v2.0} model. We compute nuclear modification factor $R_{\rm PbPb}^{\rm D}$, and show that the above nuclear effects constitute important dynamical mechanisms in the description of experimental data. The strength of colour fields (the string tension $\kappa$), partonic energy loss and jet quenching process as embedded in the model lead to a suppression factor consistent with recent published data. 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. Finally MB $p + p$ collisions which constitute theoretical baseline in our calculations is studied at the centre of mass energy $\sqrt{s}$ = 2.76 TeV and 7 TeV.
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