Dilepton production and resonance properties within a new hadronic transport approach in the context of the GSI-HADES experimental data

Abstract

The dilepton emission in heavy-ion reactions at low beam energies is examined within a hadronic transport approach. In this article the production of electron-positron pairs from a new approach named SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is introduced. The dilepton emission is consistently taken into account below the hadronic threshold. The calculations are systematically confronted with HADES data in the kinetic energy range of $1-3.5A$ GeV for elementary, proton-nucleus and nucleus-nucleus reactions. The present approach employing a resonance treatment based on vacuum properties is validated by an excellent agreement with experimental data up to system sizes of carbon-carbon collisions. After establishing this well-understood baseline in elementary and small systems, the significance of medium effects is investigated with a coarse-graining approach based on the same hadronic evolution. The effect of explicit in-medium modifications to the vector meson spectral functions is important for dilepton invariant mass spectra in ArKCl and larger systems, even though the transport approach with vacuum properties reveals similar features due the coupling to baryonic resonance and the intrinsically included collisional broadening. This article provides a comprehensive comparison of our calculations with published dielectron results from the HADES collaboration. In addition, the emission of dileptons is predicted in gold-gold and pion-beam experiments for which results are expected soon.

arXiv comment21 pages, 25 figures, replaced with accepted version, revised text for publication (Secs. I, III.A.2, III.B, III.C.1, III.D.2)

References in corpus (56)

• Big-Bang Nucleosynthesis
• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Transport-theoretical Description of Nuclear Reactions
• Study of relativistic nuclear collisions at AGS energies from p+Be to Au+Au with hadronic cascade model
• Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Hadron properties in the nuclear medium
• Rho-omega mixing, vector meson dominance and the pion form-factor
• Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration?
• Parton-Hadron-String Dynamics at Relativistic Collider Energies
• Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV
• Hadrons in strongly interacting matter
• The Spectral Function of the Rho Meson in Nuclear Matter
• Signatures of Thermal Dilepton Radiation at RHIC
• Study of the electromagnetic transition form-factors in η-> μ^+μ^-γand ω-> μ^+μ^-π^0 decays with NA60
• Comparison of heavy-ion transport simulations: Collision integral in a box
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• P-Wave Polarization of the $\rho$-Meson and the Dilepton Spectrum in Dense Matter
• Dielectron production in 12C+12C collisions at 2 AGeV with HADES
• Dilepton production and off-shell transport dynamics at SIS energies
• Aspects of Chiral Symmetry
• Dilepton Production from AGS to SPS Energies within a Relativistic Transport Approach
• Origin of the low-mass electron pair excess in light nucleus-nucleus collisions
• Dielectron production in Ar+KCl collisions at 1.76A GeV
• Study of dielectron production in C+C collisions at 1 AGeV
• Dielectron Mass Spectra from Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV
• Double Decimation and Sliding Vacua in the Nuclear Many-Body System
• Thermal Dileptons from Coarse-Grained Transport as Fireball Probes at SIS Energies
• In-Medium Spectral Functions of Vector- and Axial-Vector Mesons from the Functional Renormalization Group
• Dilepton production in proton-nucleus and nucleus-nucleus collisions at SPS energies
• Dilepton production and reaction dynamics in heavy-ion collisions at SIS energies from coarse-grained transport simulations
• Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model
• Inclusive dielectron spectra in p+p collisions at 3.5 GeV
• A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei
• Can dileptons reveal the in-medium properties of vector mesons?
• Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data
• First measurement of low momentum dielectrons radiated off cold nuclear matter
• System Size and Energy Dependence of Dilepton Production in Heavy-Ion Collisions at SIS Energies
• Production and evolution path of dileptons at HADES energies
• A coarse-graining approach for dilepton production at SPS energies
• Remarks on Delta Radiative and Dalitz Decays
• Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
• Anisotropic flow in transport+hydrodynamics hybrid approaches
• Rôle of the pion electromagnetic form factor in the $\Delta (1232)\to {\gamma }^{\ast }N$ timelike transition
• Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES
• Dilepton production in proton-proton and quasifree proton-neutron reactions at 1.25 GeV
• Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
• $\Delta$(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES
• On a Possible Explanation of the DLS-Puzzle
• Energy, centrality and momentum dependence of dielectron production at collider energies in a coarse-grained transport approach
• The Vector Probe in Heavy-Ion Reactions
• Baryonic contributions to the dilepton spectrum of nucleon-nucleon collisions
• Analysis of the exclusive final state npe${}^{+}$e${}^{-}$ in quasi-free np reaction
• Dilepton production in pp and np collisions at 1.25 GeV
• Dilepton production with the SMASH model
• Phi meson production in In-In collisions at $E_{\mathrm{lab}}$=158$A$ GeV: evidence for relics of a thermal phase

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• Particle production in a hybrid approach for a beam energy scan of Au+Au/Pb+Pb collisions between $\sqrt{s_{\mathrm{NN}}}$ = 4.3 GeV and $\sqrt{s_{\mathrm{NN}}}$ = 200.0 GeV
• SMASH -- A new hadronic transport approach
• Exploring the influence of bulk viscosity of QCD on dilepton tomography
• Dilepton Radiation from Strongly Interacting Systems
• Electrical conductivity and relaxation via colored noise in a hadronic gas
• Statistical hadronization model for heavy-ion collisions in a few GeV energy regime
• Benchmarking a Non-Equilibrium Approach to Photon Emission in Relativistic Heavy-Ion Collisions
• Strangeness production via resonances in heavy-ion collisions at SIS energies
• The applicability of hydrodynamics in heavy ion collisions at $\sqrt{s_{\mathrm{NN}}}$= 2.4-7.7 GeV
• Two-Pion production in the second resonance region in ${\pi }^{-}p$ collisions with HADES
• Dilepton Signature of a First-Order Phase Transition
• Dilepton production in microscopic transport theory with in-medium $\rho$-meson spectral function
• Particle Production in AgAg Collisions at $E_{\mathrm{Kin}}=1.58A$ GeV within a Hadronic Transport Approach
• Effects of chiral symmetry restoration on meson and dilepton production in relativistic heavy-ion collisions
• Effective spectral function of vector mesons via lifetime analysis
• Constraints on the kinetic mixing parameter ${\epsilon }^2$ for the light dark photons from dilepton production in heavy-ion collisions in the few-GeV energy range
• Elliptic flow and $R_{AA}$ of D mesons at FAIR comparing the UrQMD hybrid model and the coarse-graining approach
• Review of opportunities at the HESR-Collider with PANDA at FAIR
• Using Baryonic Charge Balance Functions to Resolve Questions about the Baryo-Chemistry of the QGP
• Spheroidal expansion and freeze-out geometry of heavy-ion collisions in the few-GeV energy regime
• Distinguishing the sources of dielectron anisotropic flow at low beam energies
• Constraints on Kinetic Mixing of Dark Photons from Dilepton Spectra
• Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions