Comprehending particle production at RHIC and LHC energies using global   measurements
  The centrality dependence of the charged-particle multiplicity densities ($dN_{ch}/d\eta$) and transverse energy densities ($dE_{T}/d\eta$) are investigated using the two-component Glauber approach for broad range of energies in heavy ion collisions at RHIC and LHC. A comprehensive study shows that the data is well described within the framework of two component model which includes the contribution of "soft processes" and "hard processes" for different centrality classes and energies. The data at two different energies are compared by means of the ratio of $dN_{ch}/d\eta$ (and $dE_{T}/d\eta$) to see the interplay of energy and $x$-scaling. 
Sadhana Dash, Basanta K. Nandi, Ranjit Nayak, Ashutosh Kumar Pandey   and Priyanka Sett
nucl-th hep-ph