Net-Proton Fluctuations at FAIR Energies Using PHQMD Model
Rudrapriya Das, A. Sharma, Susanne Glaessel, Supriya Das · Preprints.org · 2025
One of the main goals of the Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) is to investigate the properties of strongly interacting matter under high baryon densities and explore the QCD phase diagram. Fluctuations of conserved quantities like baryon number (B), electric charge (Q), and strangeness (S) are key probes for phase transitions and critical behavior, as they are theoretically connected to thermodynamic susceptibilities predicted by lattice QCD calculations. In this work, we report the measurements on cumulants of (net-)proton number distributions up to fourth-order in Au+Au collisions at sNN = 3.5-19.6 GeV using Parton-Hadron-Quantum-Molecular-Dynamics (PHQMD) model generated data. Protons and anti-protons are selected at midrapidity (|y|<0.5) within a transverse momentum range of 0.4