Multiplicity fluctuations at the quark-hadron phase transition from a fluid dynamical model

FAIR Next Generation ScientistS 2014

Herold, Christoph^1 ; Nahrgang, Marlene^2 ; Yan, Yupeng^1 ; Kobdaj, Chinorat^1

School of Physics, Suranaree University of Technology, 111 University Avenue, Nakhon Ratchasima

30000, Thailand^1

Department of Physics, Duke University, Durham

NC

27708, United States^2

关键词: Explicit dynamics;    First-order phase transitions;    Fluid dynamical model;    Heavy ion collision;    Multiplicity fluctuations;    Primary objective;    Qcd phase diagrams;    Quark-hadron phase transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/599/1/012012/pdf
DOI  :  10.1088/1742-6596/599/1/012012

来源: IOP

【 摘 要 】

The region of large net-baryon densities in the QCD phase diagram is expected to exhibit a first-order phase transition. Experimentally, its study will be one of the primary objectives for the upcoming FAIR accelerator. We model the transition between quarks and hadrons in a heavy-ion collision using a fluid which is coupled to the explicit dynamics of the chiral order parameter and a dilaton field. This allows us to investigate signals stemming from the nonequilibrium evolution during the expansion of the hot plasma. Special emphasis is put on an event-by-event analysis of baryon number fluctuations which have long since been claimed to be sensitive to a critical point.