Thermodynamics of strongly interacting matter in a hybrid model

Bhattacharyya, Abhijit (Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India) ; Ghosh, Sanjay K. (Center for Astroparticle Physics & Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India and Department of Physics, Bose Institute, 93/1, A.P.C. Road, Kolkata 700009, India) ; Maity, Soumitra (Center for Astroparticle Physics & Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India and Department of Physics, Bose Institute, 93/1, A.P.C. Road, Kolkata 700009, India) ; Raha, Sibaji (Center for Astroparticle Physics & Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India and Department of Physics, Bose Institute, 93/1, A.P.C. Road, Kolkata 700009, India) ; Ray, Rajarshi (Center for Astroparticle Physics & Space Science, Block-EN, Sector-V, Salt Lake, Kolkata 700091, India and Department of Physics, Bose Institute, 93/1, A.P.C. Road, Kolkata 700009, India) ; Saha, Kinkar (Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India) ; Samanta, Subhasis (School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni 752050, India) ; Upadhaya, Sudipa (Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India)

23 April 2019

Abstract: The equation of state and fluctuations of conserved charges in a strongly interacting medium under equilibrium conditions form the baseline upon which are built various possible scenarios in relativistic heavy-ion collision experiments. Many of these quantities have been obtained in the lattice QCD framework with reliable continuum extrapolations. Recently the Polyakov–Nambu–Jona-Lasinio model has been reparametrized to some extent to reproduce quantitatively the lattice QCD equation of state at vanishing chemical potentials. The agreement was precise except at low temperatures, possibly due to inadequate representation of the hadronic degrees of freedom in the model. This disagreement was also observed for some of the fluctuations and correlations considered. Here we address this issue by introducing the effects of hadrons through the hadron resonance gas model. The total thermodynamic potential is now a weighted sum of the thermodynamic potential of the Polyakov–Nambu–Jona-Lasinio model and that of the hadron resonance gas model. We find that the equation of state and the fluctuations and correlations obtained in this hybrid model agree satisfactorily with the lattice QCD data in the low temperature regime.


Published in: Physical Review C 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevC.99.045207
arXiv: 1708.04549
License: CC-BY-4.0



Back to search

Fulltext:
Download fulltextXML Download fulltextPDF