Saikhum, Poramin and Herold, Christoph and Yusoff, Mohamad Lukman Aidid Mohd (2022) Cumulants of the chiral order parameter in a nonequilibrium Bjorken expansion with a QCD critical point. In: 16th Siam Physics Congress, SPC 2021, 24-25 May 2021, Virtual, Online.
Full text not available from this repository.Abstract
To understand experimentally obtained net-proton number cumulants in the search for the QCD critical point, we study a dynamical model based on an effective quark-meson Lagrangian with chiral symmetry. We investigate the evolution of the expanding medium created in a heavy-ion collision using a spatially homogeneous fluid and a time-dependent order parameter, the sigma field evolved by a Langevin equation. We extract cumulants of the sigma field along a parametrized freeze-out curve and match the obtained freeze-out points to corresponding beam energies. These cumulants can be related to cumulants of the net-proton number through the sigma-proton coupling to provide a qualitative comparison to experimental data from STAR's beam energy scan program. We demonstrate that the presence of the spinodal or mixed phase region around the first-order chiral phase transition allows for a wide interval of cumulants at the lowest beam energies. © 2022 Institute of Physics Publishing. All rights reserved.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Funders: | Development and Promotion of Science and Technology Talents Project, Suranaree University of Technology, Universiti Malaya [Grant no. GPF044B-2018] |
| Uncontrolled Keywords: | Differential equations; Heavy ions; Beam energies; Chiral symmetry; Cumulants; Dynamical modeling; Freeze out; Heavy-ion collisions; Lagrangian; Model-based OPC; Non equilibrium; Order parameter; Colliding beam accelerators |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 12 Feb 2025 08:33 |
| Last Modified: | 12 Feb 2025 08:33 |
| URI: | http://eprints.um.edu.my/id/eprint/43244 |
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