On Production of `Soft' Particles in Au+Au and Pb+Pb Collisions at High   Energies
  Production of low-$p_T$ (soft) hadronic particles in high energy collisions constitutes a significant corner of special interests and problems, as the perturbative quantum chromodynamics (pQCD) does not work in this region. We have probed here into the nature of the light particle production in two symmetric nuclear collisions at two neighbouring energies with the help of two non-standard models. The results are found to be in good agreement with data. Despite this, as the models applied here are not intended to provide deep insights into the actual physical processes involved in such collisions, the phenomenological bounds and constraints which cannot be remedied for the present continue to exist. 
A. C. Das Ghosh, Goutam Sau, S. K. Biswas and S. Bhattacharyya
hep-ph