Charged pion production in $\mathbf{Au}+\mathbf{Au}$ collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}$ = 2.4$\mathbf{GeV}$

Abstract

We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ = 1.23 A GeV) in four centrality classes in the range 0 - 40$\%$ of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the world data, but undershoot by $2.5\sigma$ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations.

arXiv comment17 pages, 19 figures, 4 tables

References in corpus (11)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Transport-theoretical Description of Nuclear Reactions
• Modelling the many-body dynamics of heavy ion collisions: Present status and future perspective
• Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions
• Azimuthal correlations of pions in relativistic heavy ion collisions at 1 GeV/nucl.
• Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) -- A Novel Microscopic N-Body Transport Approach for Heavy-Ion Collisions, Dynamical Cluster Formation and Hypernuclei Production
• Neutral Pions and Eta Mesons as Probes of the Hadronic Fireball in Nucleus-Nucleus Collisions around 1A GeV
• Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
• SMASH -- A new hadronic transport approach
• Coulomb Effects on Particle Spectra in Relativistic Nuclear Collisions
• Dynamics of disordered heavy Fermion systems

Cited by in corpus (15)

• Dense Nuclear Matter Equation of State from Heavy-Ion Collisions
• Energy dependence of light hypernuclei production in heavy-ion collisions from a coalescence and statistical-thermal model perspective
• Comparison of heavy ion transport simulations: Ag+Ag collisions at Elab = 1.58 AGeV
• Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era
• Dilepton Signature of a First-Order Phase Transition
• Analyzing transverse momentum spectra by a new method in high-energy collisions
• Dilepton production in microscopic transport theory with in-medium $\rho$-meson spectral function
• Effects of chiral symmetry restoration on meson and dilepton production in relativistic heavy-ion collisions
• Model dependence of the number of participant nucleons and observable consequences in heavy-ion collisions
• Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam}=1.23$$A$ GeV by the IQMD model
• Spheroidal expansion and freeze-out geometry of heavy-ion collisions in the few-GeV energy regime
• Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions
• Nucleon-$\Delta$ elastic cross section in isospin-asymmetric nuclear medium with inclusion of scalar-isovector $\delta$ meson field
• Probing the Three-dimension Emission Source and Neutron Skin via $\pi$-$\pi$ Correlations in Heavy-Ion Collisions
• ${}^3$H and ${}^3$He nuclei production in a combined thermal and coalescence framework for heavy-ion collisions in the few-GeV energy regime