Abstract:
Hadronic freezeout during the evolution of the medium created in heavy-ion collisions is an
important phenomena. It is quite useful to find a universal freezeout condition for each and
every nuclear collisions. In this article, we have constructed a hybrid model to calculate the
ratio of transverse energy to total mean multiplicity ET /Nch, since this ratio can possibly act as a
freezeout condition in heavy-ion collision experiments. Present hybrid model blends two approaches
: Tsallis statistics and wounded quark approach. Recently, Tsallis statistics has been reliably used
to obtain the transverse momentum distribution of charged hadrons produced in relativistic ion
collisions. On the other side it has been shown that the pseudorapidity distribution of charged
hadrons can be calculated satisfactorily using the wounded quark model (WQM). We have used
this hybrid model to calculate the transverse energy density distributions, dET /dη at midrapidity
using charged particle pseudorapidity distributions, dNch/dη and mean transverse momentum hpT i
in various type of nuclear collisions. We found that present hybrid model satisfactorily explains
the experimental data whether other models fail to reproduce the data at central and at peripheral
collisions simultaneously. Finally, ratio of transverse energy to total mean multiplicity, ET /Nch has
been computed within hybrid model and compared with the available experimental data at RHIC
and LHC energies. We observed no explicit dependence of ET /Nch on energy as well as centrality
and thus it can definitely act as a freezeout criteria.
