Subthreshold pion production within a transport description of central Au+Au collisions

Abstract

Mapping out the equation of state (EOS) of nuclear matter is a long standing problem in nuclear physics. Recent emphasis is onto the density dependence of the symmetry energy, with experiments needing dedicated symmetry-energy observables. Towards the latter goal, we employ pBUU transport model to simulate pion production in heavy ion collision (HIC). We find that the net pion yield tests the momentum dependence of nuclear mean field (MF). In exploring the sensitivity of pion observables to the symmetry energy at higher than normal densities, we find that our calculations of pion ratios contradict, at some level, predictions from both IBUU and ImIQMD models. We propose to employ the pion ratio in the high-energy tail of spectra in future experiments, to distinguish between different variants of high-density symmetry energy.

12 pages, 13 figures

References in corpus (3)

• The Giant Dipole Resonance as a quantitative constraint on the symmetry energy
• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Systematics of central heavy ion collisions in the 1A GeV regime

Cited by in corpus (63)

• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
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• Comparison of heavy-ion transport simulations: Collision integral with pions and $\Delta$ resonances in a box
• Dynamics of clusters and fragments in heavy-ion collisions
• The impact of energy conservation in transport models on the ${\pi }^{-}/{\pi }^{+}$ multiplicity ratio in heavy-ion collisions and the symmetry energy
• Comparison of Heavy-Ion Transport Simulations: Mean-field Dynamics in a Box
• Decoding the Density Dependence of the Nuclear Symmetry Energy
• S$\pi$RIT: A time-projection chamber for symmetry-energy studies
• Transport approaches for the Description of Intermediate-Energy Heavy-Ion Collisions
• Symmetry energy investigation with pion production from Sn+Sn systems
• Probing neutron-proton dynamics by pions
• Medium effects on pion production in heavy ion collisions
• Collision dynamics at medium and relativistic energies
• Progress of Quantum Molecular Dynamics model and its applications in Heavy Ion Collisions
• Sensitivity of Au+Au collisions to the symmetric nuclear matter equation of state at 2 -- 5 nuclear saturation densities
• Constraining the density dependence of the symmetry energy using the multiplicity and average $p_T$ ratios of charged pions
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• Effects of a phase transition on two-pion interferometry in heavy-ion collisions at $\sqrt{s_{\mathrm{NN}}}=2.4-7.7$ GeV
• Insights on pion production mechanism and symmetry energy at high density
• Symmetry potential of $\Delta (1232)$ resonance and its effects on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions near the pion production threshold
• Ruling out the supersoft high-density symmetry energy from the discovery of PSR J0740+6620 with mass $2.14_{-0.09}^{+0.10}{M}_{\odot }$
• Symmetry energy systematics and its high density behavior
• In-medium and isospin effects on particle production near threshold energies in heavy-ion collisions
• Modeling pion production in heavy-ion collisions at intermediate energies
• Cross-checking the symmetry energy at high densities
• Effects of pion potential and nuclear symmetry energy on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions at beam energies around the pion production threshold
• Symmetry energy extracted from the S$\pi$RIT pion data in Sn+Sn systems
• Bayesian model averaging for nuclear symmetry energy from effective proton-neutron chemical potential difference of neutron-rich nuclei
• Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era
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• Effect of Delta potential on the pion-/pion+ ratio in heavy-ion collisions at intermediate energies
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• Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables
• Effects of Pauli blocking on pion production in central collisions of neutron-rich nuclei
• Isoscaling in central Sn+Sn collisions at 270 MeV/u
• Effects of symmetry energy in ${}^{132}\mathrm{Sn}{+}^{124}\mathrm{Sn}$ reaction at 300 MeV/nucleon
• Effect of energy conservation on in-medium $\mbox{NN}\to \mbox{N}Δ$ cross section in isospin-asymmetric nuclear matter
• Competition between Coulomb and Symmetry Potential in Semi-peripheral Heavy-ion Collisions
• Examination of an isospin-dependent single-nucleon momentum distribution for the isospin-asymmetric nuclear matter in heavy-ion collisions
• Collision integral with momentum-dependent potentials and its impact on pion production in heavy-ion collisions
• Preequilibrium particle emissions and in-medium effects on the pion production in heavy-ion collisions
• KATANA - a charge-sensitive triggering system for the S$\pi$RIT experiment
• Effects of retarded electrical fields on observables sensitive to the high-density behavior of nuclear symmetry energy in heavy-ion collisions at intermediate energies
• Space Charge Effects in the S$\pi$RIT Time Projection Chamber
• Beam energy dependence of the relativistic retardation effects of electrical fields on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions
• Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations
• Effects of incompressibility $K_0$ in heavy-ion collisions at intermediate energies
• RMF models with $\sigma$-scaled hadron masses and couplings for description of heavy-ion collisions below 2A GeV
• A new probe to study symmetry energy at low density by deuteron breakup reaction
• Effects of density-dependent scenarios of in-medium nucleon-nucleon interactions in heavy-ion collisions
• Necessity of selfconsistent calculations for the electromagnetic field in probing the nuclear symmetry energy using pion observables in heavy-ion collisions
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• Dynamics of one-dimensional correlated nuclear systems within non-equilibrium Green's function theory
• Neutron Star Radii from Laboratory Experiments
• In-medium $\Delta (1232)$ potential, pion production in heavy-ion collisions and the symmetry energy
• Multi-strange and charmed hadrons: A novel probe for the QCD equation of state at high baryon densities
• Effects of an induced electric field on π^{-}/π^{+} ratio in heavy-ion collisions
• Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions
• Isospin blocking and its effects in heavy-ion collisions
• In-medium pion dispersion relation and medium correction of $N\pi \leftrightarrow \Delta$ near the threshold energy of pion production
• Angular momentum conservation and pion production in intermediate-energy heavy-ion collisions