Multiparticle production in nuclear collisions using effective-energy approach

Aditya Nath Mishra,Edward K.G Sarkisyan,Raghunath Sahoo,Alexander S Sakharov

doi:10.1051/epjconf/20159001001

Abstract

The dependencies of charged particle pseudorapidity density and transverse energy pseudorapidity density at midrapidity on the collision energy and on the number of nucleon participants, or centrality, measured in nucleus-nucleus collisions are studied in the energy range spanning a few GeV to a few TeV per nucleon. The study is based on the earlier proposed model, combining the constituent quark picture together with Landau relativistic hydrodynamics and shown to interrelate the measurements from different types of collisions. Within this picture, the dependence on the number of participants in heavy-ion collisions are found to be well described in terms of the effective energy defined as a centrality-dependent fraction of the collision energy. The effective energy approach is shown to reveal a similarity in the energy dependence for the most central and centrality data in the entire available energy range. Predictions are made for the forthcoming higher-energy measurements in heavy-ion collisions at the LHC.

Highlights

To interpret these observations, the energy dissipation approach of constituent quark participants has been proposed in [12] by two of the authors of this report
In the picture proposed in [12], the Landau hydrodynamics is combined with the constituent quark model [13]
This makes the secondary particle production to be basically driven by the amount of the initial effective energy deposited by participants – quarks or nucleons, into the Lorentz contracted overlap region

Summary

Introduction

The energy dissipation approach of constituent quark participants has been proposed in [12] by two of the authors of this report. Using the effective c.m. energy approach, we apply the obtained hybrid function fit of the midrapidity density measured in head-on collision data, Eq (5), to the centrality data, shown in Fig. 1 as a function of Npart.

Results

Conclusion