Violation of NCQ scaling in hadron elliptic flow in Au+Au collisions at $\sqrt{s_{NN}}=3.0-7.7GeV
arXiv:2505.07187 · doi:10.1016/j.physletb.2025.139752
Abstract
We investigate the number-of-constituent-quark (NCQ) scaling of elliptic flow for various hadrons in non-central Au+Au collisions at \(\sqrt{s_{NN}} = 3.0\text{--}7.7\,\mathrm{GeV}\) using the AMPT model with string melting (SM) and pure hadron cascade (HC) modes. For the SM case, NCQ scaling is absent at \(\sqrt{s_{NN}} =3.0\,\mathrm{GeV}\) but is largely restored by \(\sqrt{s_{NN}} =3.9\,\mathrm{GeV}\). Although quark coalescence occurs at \(\sqrt{s_{NN}} =3.0\,\mathrm{GeV}\), the lack of NCQ scaling is attributed to the insufficient development of quark elliptic flow and the limited production of strange quarks and antiquarks. This finding suggests that NCQ scaling could not be considered a definitive signature of quark-gluon plasma (QGP) formation in the RHIC fixed-target energy region. For the HC case, as expected, no NCQ scaling is observed. However, a mass ordering in the elliptic flow emerges at \(\sqrt{s_{NN}} =4.5\,\mathrm{GeV}\), indicating that full thermalization may not be a prerequisite for mass ordering.
7 pages, 6 figures, Physics Letters B in production
References in corpus (15)
- Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
- Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV
- Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions
- Relativistic hydrodynamics for heavy-ion collisions
- Elliptic flow of identified hadrons in Pb-Pb collisions at = 2.76 TeV
- Momentum spectra, anisotropic flow, and ideal fluids
- Elliptic Flow: A Brief Review
- Flow and interferometry results from Au+Au collisions at = 4.5 GeV
- Double strangeness production as a probe of nuclear equation of state at high densities
- Phase diagram determination at fivefold nuclear compression
- Directed and elliptic flows of protons and deuterons in HADES Au+Au collisions at GeV
- Probing the incompressibility of dense hadronic matter near QCD phase transition in relativistic heavy-ion collisions
- A method for probing the formation of quark matter
- Evidence of Coalescence Sum Rule in Elliptic Flow of Identified Particles in High-energy Heavy-ion Collisions
- Exploring hadron-quark phase transition in heavy-ion collisions using particle emission ratios in heavy and light reaction systems