Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons

Abstract

The in-medium spectral functions of $\rho$ and $\omega$ mesons and the broadening of the nucleon resonances at finite baryon density are calculated self-consistently by combining a resonance dominance model for the vector meson production with an extended vector meson dominance model. The influence of the in-medium modifications of the vector meson properties on the dilepton spectrum in heavy-ion collisions is investigated. The dilepton spectrum is generated for the C+C reaction at 2.0$A$ GeV and compared with recent HADES Collaboration data. The collision dynamics is then described by the Tübingen relativistic quantum molecular dynamics transport model. We find that an iterative calculation of the vector meson spectral functions that takes into account the broadening of the nucleon resonances due to their increased in-medium decay branchings is convergent and provides a reasonable description of the experimental data in the mass region $0.45\le M\le 0.75$ GeV. On the other side, the theoretical calculations slightly underestimate the region $m_{\pi }\le M\le 0.4$ GeV. Popular in-medium scenarios such as a schematic collisional broadening and dropping vector mesons masses are discussed as well.

v2: some references, comments and one Fig. added; accepted for publication in Phys. Rev. C

References in corpus (72)

• The high-precision, charge-dependent Bonn nucleon-nucleon potential (CD-Bonn)
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Current correlation functions, QCD sum rules and vector mesons in baryonic matter
• Kaon production in heavy ion reactions at intermediate energies
• Enhancement of low-mass dileptons in heavy-ion collisions
• Chiral Restoration in Hot and/or Dense Matter
• Evidence for a Soft Nuclear Equation-of-State from Kaon Production in Heavy Ion Collisions
• Probing the nuclear equation of state by $K^{+}$ production in heavy ion collisions
• Effective Nucleon Masses in Symmetric and Asymmetric Nuclear Matter
• First observation of in-medium modifications of the omega meson
• Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV
• Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p + A Reactions
• The Spectral Function of the Rho Meson in Nuclear Matter
• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV I: pion-induced results and hadronic parameters
• A unitary model for meson-nucleon scattering
• The Relativistic Dirac-Brueckner Approach to Asymmetric Nuclear Matter
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• P-Wave Polarization of the $\rho$-Meson and the Dilepton Spectrum in Dense Matter
• Semiclassical transport of particles with dynamical spectral functions
• Dielectron production in 12C+12C collisions at 2 AGeV with HADES
• Dilepton production and off-shell transport dynamics at SIS energies
• Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and $\gamma N$ reactions for c.m. energies up to 2 GeV
• Hadronic Spectral Functions in Nuclear Matter
• Dilepton Spectra from Decays of Light Unflavored Mesons
• Study of dielectron production in C+C collisions at 1 AGeV
• Observation of $\rho /\omega$ Meson Modification in Nuclear Matter
• Properties of $\rho$ and $\omega$ Mesons at Finite Temperature and Density as Inferred from Experiment
• QCD Sum Rules, Scattering Length and the Vector Mesons in Nuclear Medium
• eta in the nuclear medium within a chiral unitary approach
• Intermediate mass excess of dilepton production in heavy ion collisions at BEVALAC energies
• Chiral approach to the rho meson in nuclear matter
• Inclusive Dielectron Cross Sections in p+p and p+d Interactions at Beam Energies from 1.04 to 4.88 GeV
• Dilepton production in proton-nucleus and nucleus-nucleus collisions at SPS energies
• Modifications of the Rho Meson from the Virtual Pion Cloud in Hot and Dense Matter
• Di-Electron Bremsstrahlung in Intermediate-Energy pn and Dp Collisions
• Momentum Dependence of the Pion Cloud for Rho Mesons in Nuclear Matter
• Dilepton production in heavy ion collisions at intermediate energies
• Dilepton production and $m_T$-scaling at BEVALAC/SIS energies
• Near-Threshold Production of omega Mesons in the pp -> pp omega Reaction
• The spectral function of the omega meson in nuclear matter from a coupled-channel resonance model
• Role of baryonic resonances in the dilepton emission in nucleon-nucleon collisions
• Microscopic models and effective equation of state in nuclear collisions at FAIR energies
• Electromagnetic transition form factors and dilepton decay rates of nucleon resonances
• Production of $\omega$ mesons in proton-proton collisions
• $\rho$-meson properties at finite nuclear density
• In-medium dependence and Coulomb effects of the pion production in heavy ion collisions
• Remarks on Delta Radiative and Dalitz Decays
• Coupling of Baryon Resonances to the $N\omega$ channel
• In-medium spectral change of omega mesons as a probe of QCD four-quark condensate
• QCD sum rule analysis for light vector and axial-vector mesons in vacuum and nuclear matter
• Off-shell omega production in proton-proton collisions near threshold
• Evidence for In-Medium Changes of Four-Quark Condensates
• New results from CERES
• Life time of resonances in transport simulations
• In-medium properties of the D13(1520) nucleon resonance
• Dilepton production in proton-proton collisions at BEVALAC energies
• Equilibration within a semiclassical off-shell transport approach
• Temperature and thermodynamic instabilities in heavy ion collisions
• Dilepton yields from Brown-Rho scaled vector mesons including memory effects
• Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV
• Probing nuclear expansion dynamics with ${\pi }^{-}/{\pi }^{+}$-spectra
• Dilepton production at HADES: theoretical predictions
• Consequences of kinetic non-equilibrium for the nuclear equation-of-state in heavy ion collision
• Study of omega-meson production in pp collisions at ANKE
• Pi N -> Omega N in a Coupled-Channel Approach
• Theoretical Analysis of Dilepton Spectra in Heavy Ion Collisions at GSI-FAIR Energies
• Vector meson angular distributions in proton-proton collisions
• Dispersion Relation of the Rho-Meson at Finite Temperature and Density
• Exclusive $\varphi$ production in proton-proton collisions in the resonance model
• $\rho /\omega$ properties from dilepton spectra in $pA$ reactions at 12 GeV
• Dilepton production in pp and CC collisions with HADES

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