Jan Steinheimer
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View article: Toward a foundation model for heavy-ion collision experiments based on point-cloud diffusion
Toward a foundation model for heavy-ion collision experiments based on point-cloud diffusion Open
A novel point-cloud diffusion model for relativistic heavy-ion collisions, capable of ultrafast generation of complete, event-by-event collision output, is introduced. When trained on ultrarelativistic quantum molecular dynamics cascade si…
View article: Electromagnetic probes as signatures for a first-order QCD phase transition
Electromagnetic probes as signatures for a first-order QCD phase transition Open
We investigate dimuon production in the context of a first-order phase transition in QCD matter using a chiral fluid dynamics model. This approach incorporates non-equilibrium effects such as entropy production and reheating, which emerge …
View article: $K^*(892)$ Resonance Suppression in Ar+Sc Collisions at SPS Energies
$K^*(892)$ Resonance Suppression in Ar+Sc Collisions at SPS Energies Open
We investigate the production and suppression of short-lived $K^*(892)$ resonances in p+p and Ar+Sc collisions at CERN-SPS energies ($\sqrt{s_{\mathrm{NN}}} = $ 8.8, 11.9, and 16.8~GeV) using the Ultra-relativistic Quantum Molecular Dynami…
View article: Ultrafast, event-by-event heavy-ion simulations for next-generation experiments
Ultrafast, event-by-event heavy-ion simulations for next-generation experiments Open
We present a novel deep generative framework that uses probabilistic diffusion models for ultrafast, event-by-event simulations of heavy-ion collision output. This new framework is trained on ultrarelativistic quantum molecular dynamics (U…
View article: Possible explanation of the irregular energy dependence of the rapidity width of $$\phi $$ mesons observed in Pb+Pb collisions
Possible explanation of the irregular energy dependence of the rapidity width of $$\phi $$ mesons observed in Pb+Pb collisions Open
Experimental data from the NA49 collaboration show an unexpectedly steep rise of the rapidity width of the $$\phi $$ meson as function of beam energy, which was suggested as possible interesting signal for novel physics. In this work we …
View article: Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations
Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations Open
A combined constraint on the QCD equation of state, at high densities, from connecting neutron star observations to data from heavy ion reactions is presented. We use the Chiral Mean Field Model which can describe neutron star and iso-spin…
View article: Directed and elliptic flow of light nuclei and hypernuclei in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=3$ GeV: Coalescence vs. Statistical Fragmentation
Directed and elliptic flow of light nuclei and hypernuclei in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=3$ GeV: Coalescence vs. Statistical Fragmentation Open
The harmonic flow coefficients of light nuclei and hypernuclei in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=3$ GeV are investigated using the Ultra-relativistic Quantum Molecular Dynamics transport model. For the Equation-of-State we emplo…
View article: Time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model
Time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model Open
The UrQMD model with a density dependent equation of state, including a first-order phase transition, is used to study the time dependence of baryon number and proton number susceptibilities up to third order in heavy ion reactions of Elab…
View article: Explanation of the observed violation of isospin symmetry in relativistic nucleus-nucleus reactions
Explanation of the observed violation of isospin symmetry in relativistic nucleus-nucleus reactions Open
The violation of isospin symmetry in nucleus-nucleus reactions, as shown in the ratio ${R_K=(K^++K^-)/(K^0+\bar{K}^0)}$ presented by NA61/SHINE, can be understood by introducing results from color-string fragmentation in $e^+e^-$ to nuclea…
View article: Charmed hadron production from secondary anti-proton + proton annihilations in p+A reactions at FAIR
Charmed hadron production from secondary anti-proton + proton annihilations in p+A reactions at FAIR Open
We present estimates for the production cross sections of exotic states ($Λ_c, Σ_c, Ξ_c, D\, \mathrm{and}\, D_s$) from secondary $\overline B + B$ annihilations in p+A reactions from $E_\mathrm{lab}=10-30A$~GeV. We focus specifically on th…
View article: Ultra fast, event-by-event heavy-ion simulations for next generation experiments
Ultra fast, event-by-event heavy-ion simulations for next generation experiments Open
We present a novel deep generative framework that uses probabilistic diffusion models for ultra fast, event-by-event simulations of heavy-ion collision output. This new framework is trained on UrQMD cascade data to generate a full collisio…
View article: Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations
Simultaneous description of high density QCD matter in heavy ion collisions and neutron star observations Open
A combined constraint on the QCD equation of state, at high densities, from connecting neutron star observations to data from heavy ion reactions is presented. We use the Chiral Mean Field Model which can describe neutron star and iso-spin…
View article: Momentum dependent potentials from a parity doubling CMF model in UrQMD: results on flow and particle production
Momentum dependent potentials from a parity doubling CMF model in UrQMD: results on flow and particle production Open
The quantum molecular dynamics (QMD) part of the UrQMD model is extended to allow implementation of momentum dependent potentials from a parity doubling chiral mean field (CMF) model. Important aspects like energy conservation and effects …
View article: Bayesian constraints on the high density QCD EoS for nuclear matter from Heavy-ion collision data
Bayesian constraints on the high density QCD EoS for nuclear matter from Heavy-ion collision data Open
A Bayesian framework is introduced to constrain the density dependence of the Equation of State (EoS) for nuclear matter. The EoS is inferred using existing measurements of elliptic flow and the mean transverse kinetic energy of protons in…
View article: The structure of the $$f_0(980)$$ from system size dependent hadronic resonance ratios in p + p, p + Pb, and Pb + Pb collisions at the LHC
The structure of the $$f_0(980)$$ from system size dependent hadronic resonance ratios in p + p, p + Pb, and Pb + Pb collisions at the LHC Open
It is shown that the hadronic phase in ultra-relativistic heavy ion collisions can be used to understand the properties of the $$f_0(980)$$ resonance. In particular it is shown that the centrality dependence of the $$f_0(980)/\pi …
View article: The time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model
The time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model Open
The UrQMD model with a density dependent equation of state, including a first-order phase transition, is used to study the time dependence of baryon number and proton number susceptibilities up to third order in heavy ion reactions of $E_{…
View article: Momentum dependent potentials from a parity doubling CMF model in UrQMD: Results on flow and particle production
Momentum dependent potentials from a parity doubling CMF model in UrQMD: Results on flow and particle production Open
The quantum molecular dynamics (QMD) part of the UrQMD model is extended to allow implementation of momentum dependent potentials from a parity doubling chiral mean field (CMF) model. Important aspects like energy conservation and effects …
View article: Resonance suppression during the hadronic stage from the FAIR to the intermediate RHIC energy regime
Resonance suppression during the hadronic stage from the FAIR to the intermediate RHIC energy regime Open
The energy and centrality dependence of the kaon resonance ratio $(K^{*0}+\Bar{K}^{*0})/(K^+ + K^-)$ is explored in the RHIC-BES and CBM-FAIR energy regime. To this aim, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model is em…
View article: Possible explanation of the irregular energy dependence of the rapidity width of $ϕ$ mesons observed in Pb+Pb collisions
Possible explanation of the irregular energy dependence of the rapidity width of $ϕ$ mesons observed in Pb+Pb collisions Open
Experimental data from the NA49 collaboration show an unexpectedly steep rise of the rapidity width of the $ϕ$ meson as function of beam energy, which was suggested as possible interesting signal for novel physics. In this work we show tha…
View article: The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC
The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC Open
It is shown that the hadronic phase in ultra-relativistic heavy ion collisions can be used to understand the properties of the $f_0(980)$ resonance. In particular it is shown that the centrality dependence of the $f_0(980)/π$ and $f_0(980)…
View article: Effect of finite volume on thermodynamics of quark-hadron matter
Effect of finite volume on thermodynamics of quark-hadron matter Open
The effects of a finite system volume on thermodynamic quantities, such as the pressure, energy density, specific heat, speed of sound, conserved charge susceptibilities, and correlations, in hot and dense strongly interacting matter are s…
View article: Spinodal enhancement of fluctuations in nucleus-nucleus collisions
Spinodal enhancement of fluctuations in nucleus-nucleus collisions Open
Subensemble Acceptance Method (SAM) [1, 2] is an essential link between measured event-by-event fluctuations and their grand canonical theoretical predictions such as lattice QCD. The method allows quantifying the global conservation law e…
View article: Spinodal enhancement of fluctuations in nucleus-nucleus collisions
Spinodal enhancement of fluctuations in nucleus-nucleus collisions Open
Subensemble Acceptance Method (SAM) [1,2] is an essential link between measured event-by-event fluctuations and their grand canonical theoretical predictions such as lattice QCD. The method allows quantifying the global conservation law ef…
View article: Enhanced Dilepton production near the color superconducting phase and the QCD critical point
Enhanced Dilepton production near the color superconducting phase and the QCD critical point Open
The dilepton production yields in relativistic heavy ion collisions are investigated along isentropic trajectories in the quark (Wigner) phase within the two-flavor Nambu-Jona-Lasinio model. An enhancement of the ultra-low energy dilepton …
View article: QCD Equation of State of Dense Nuclear Matter from a Bayesian Analysis of Heavy-Ion Collision Data
QCD Equation of State of Dense Nuclear Matter from a Bayesian Analysis of Heavy-Ion Collision Data Open
Bayesian methods are used to constrain the density dependence of the QCD equation of state (EOS) for dense nuclear matter using the data of mean transverse kinetic energy and elliptic flow of protons from heavy ion collisions (HICs), in th…
View article: Enhanced dilepton emission from a phase transition in dense matter
Enhanced dilepton emission from a phase transition in dense matter Open
It is demonstrated that the presence of a phase transition in heavy-ion collisions, at beam energies that probe dense quantum chromodynamics (QCD) matter, leads to a significant enhancement of the dilepton yield at low invariant mass and r…
View article: Probing the QCD phase transition with hadron multiplicity ratios
Probing the QCD phase transition with hadron multiplicity ratios Open
We investigate the impact of a first-order chiral phase transition and critical point on hadron multiplicity ratios. We model the dynamical expansion of the hot and dense matter created in a heavy ion collision with a Bjorken hydrodynamics…
View article: Extraction of global event features in heavy-ion collision experiments using PointNet
Extraction of global event features in heavy-ion collision experiments using PointNet Open
A Deep Learning based method to extract global event properties in heavy-ion collision experiments is introduced. The order invariant, point cloud representation of experimental data is chosen to train the models. The point clouds of hits …