Ralf Rapp
YOU?
Author Swipe
View article: Semiclassical treatment of bottomonium suppression and regeneration in $p+{\rm Pb}$ collisions
Semiclassical treatment of bottomonium suppression and regeneration in $p+{\rm Pb}$ collisions Open
We study bottomonium suppression in $p+ {\rm Pb}$ relative to $p+p$ collisions at center-of-mass energies of $\sqrt{s_{NN}}= 5.02$ and 8.16~TeV. Specifically, we combine cold nuclear matter effects (nuclear modifications of the parton dens…
View article: Nonperturbative Heavy-Flavor Transport Approach for Hot QCD
Nonperturbative Heavy-Flavor Transport Approach for Hot QCD Open
The heavy charm and bottom quarks are unique probes of the transport properties of the quark-gluon plasma (QGP) and its hadronization in high-energy nuclear collisions. A key challenge in this context is to embed the interactions of the he…
View article: Non-perturbative quarkonium dissociation rates in strongly coupled quark-gluon plasma
Non-perturbative quarkonium dissociation rates in strongly coupled quark-gluon plasma Open
A bstract Heavy quarks and quarkonia are versatile probes of the transport properties of the hot QCD medium produced in ultra-relativistic heavy-ion collisions (URHICs). A robust description of heavy-flavor transport coefficients requires …
View article: Quark Recombination
Quark Recombination Open
Hadronization is a fundamental process occurring at a distance scale of about $1\,\rm fm \simeq Λ_{QCD}^{-1} $, hence within non-perturbative dynamics. In elementary collisions, like $e^+e^-$, $e^-p$, or $pp$, phenomenological approaches t…
View article: European Strategy for Particle Physics 2026: the NA60+/DiCE experiment at the SPS
European Strategy for Particle Physics 2026: the NA60+/DiCE experiment at the SPS Open
The exploration of the phase diagram of Quantum ChromoDynamics (QCD) is carried out by studying ultrarelativistic heavy-ion collisions. The energy range covered by the CERN SPS ($\sqrt{s_{\rm {NN}}} \sim 6-17$ GeV) is ideal for the investi…
View article: Non-perturbative quarkonium dissociation rates in strongly coupled quark-gluon plasma
Non-perturbative quarkonium dissociation rates in strongly coupled quark-gluon plasma Open
Heavy quarks and quarkonia are versatile probes of the transport properties of the hot QCD medium produced in ultra-relativistic heavy-ion collisions (URHICs). A robust description of heavy-flavor transport coefficients requires a microsco…
View article: Interacting mesons as degrees of freedom in a chiral model
Interacting mesons as degrees of freedom in a chiral model Open
We study the equation of state of hot and dense hadronic matter using an extended Chiral Mean Field (CMF) model framework where the addition is the inclusion of interactions of thermally excited mesons. This is implemented by calculating t…
View article: Quarkonium Spectroscopy in the Quark-Gluon Plasma
Quarkonium Spectroscopy in the Quark-Gluon Plasma Open
The properties of bound states are fundamental to hadronic spectroscopy and play a central role in the transition from hadronic matter to a quark-gluon plasma (QGP). In a strongly coupled QGP (sQGP), the interplay of temperature, binding e…
View article: Polarization of thermal dilepton radiation
Polarization of thermal dilepton radiation Open
The invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium…
View article: Reflections and Tributes
Reflections and Tributes Open
It was in the year 1960 that our paths first crossed. Hans was looking for a diploma thesis with Professor Maier-Leibnitz, and I was fortunate to have him assigned to me, an assistant at the Institute of Technical Physics at the Technical …
View article: Electric conductivity of QCD matter and dilepton spectra in heavy-ion collisions
Electric conductivity of QCD matter and dilepton spectra in heavy-ion collisions Open
The electric conductivity, σel, is a fundamental transport coefficient of QCD matter that can be related to the zero-energy limit of the electromagnetic (EM) spectral function at vanishing three-momentum in the medium. The EM spectral func…
View article: Bottomonium Properties in QGP from a Lattice-QCD Informed T-Matrix Approach
Bottomonium Properties in QGP from a Lattice-QCD Informed T-Matrix Approach Open
Recent lattice quantum chromodynamics (lQCD) computations of bottomonium correlation functions with extended sources provide new insights into heavy-quark dynamics at distance scales which are of the order of the inverse temperature. We an…
View article: Anomalous soft photons: status and perspectives
Anomalous soft photons: status and perspectives Open
This report summarizes the work of the EMMI Rapid Reaction Task Force on "Real and Virtual Photon Production at Ultra-Low Transverse Momentum and Low Mass at the LHC". We provide an overview of the soft-photon puzzle, i.e., of the long-sta…
View article: Electric Conductivity of QCD Matter and Dilepton Spectra in Heavy-Ion Collisions
Electric Conductivity of QCD Matter and Dilepton Spectra in Heavy-Ion Collisions Open
The electric conductivity, $σ_{\rm el}$, is a fundamental transport coefficient of QCD matter that can be related to the zero-energy limit of the electromagnetic (EM) spectral function at vanishing 3-momentum in the medium. The EM spectral…
View article: Charm and Bottom Hadrons in Hot Hadronic Matter
Charm and Bottom Hadrons in Hot Hadronic Matter Open
Heavy quarks, and the hadrons containing them, are excellent probes of the QCD medium formed in high-energy heavy-ion collisions, as they provide essential information on the transport properties of the medium and how quarks color-neutrali…
View article: Charmonium Transport in Heavy-Ion Collisions at the LHC
Charmonium Transport in Heavy-Ion Collisions at the LHC Open
We provide an update on our semi-classical transport approach for quarkonium production in high-energy heavy-ion collisions, focusing on J/ψ and ψ(2S) mesons in 5.02 TeV Pb-Pb collisions at the Large Hadron Collider (LHC) at both forward a…
View article: Hadronization of heavy quarks
Hadronization of heavy quarks Open
Heavy-flavor hadrons produced in ultrarelativistic heavy-ion collisions are a sensitive probe for studying hadronization mechanisms of the quark-gluon-plasma. In this paper, we survey how different transport models for the simulation of he…
View article: Charmonium Transport in Ultra-Relativistic Heavy-Ion Collisions at the LHC
Charmonium Transport in Ultra-Relativistic Heavy-Ion Collisions at the LHC Open
We provide an update on our semi-classical transport approach for quarkonium production in high-energy heavy-ion collisions, focusing on $J/ψ$ and $ψ(2S)$ mesons in 5.02 TeV Pb-Pb collisions at the Large Hadron Collider (LHC) at both forwa…
View article: Spin-Induced Interactions and Heavy-Quark Transport in the QGP
Spin-Induced Interactions and Heavy-Quark Transport in the QGP Open
A previously constructed $T$-matrix approach for studying the quark-gluon plasma (QGP) is improved by incorporating spin-dependent interactions between partons. These interactions arise from the relativistic corrections to the Cornell pote…
View article: Analysis of Static Wilson Line Correlators from Lattice QCD at Finite Temperature with $T$-matrix Approach
Analysis of Static Wilson Line Correlators from Lattice QCD at Finite Temperature with $T$-matrix Approach Open
We employ a thermodynamic $T$-matrix approach to study Wilson line correlators (WLCs) for a static quark-antiquark pair within the quark-gluon plasma (QGP). By refining earlier determined input parameters, self-consistent $T$-matrix calcul…
View article: Thermal dileptons as QCD matter probes at SIS
Thermal dileptons as QCD matter probes at SIS Open
Electromagnetic radiation is emitted during the whole course of a heavy-ion collision and can escape from the collision zone without further interactions. This makes it an ideal tool to study the properties of hot and dense QCD matter. To …
View article: Understanding the properties of the fireball with the polarization signature of thermal dileptons
Understanding the properties of the fireball with the polarization signature of thermal dileptons Open
Multi-differential measurements of dilepton spectra serve as a unique tool to characterize the properties of matter in the interior of the hot and dense fireball created in heavy-ion collisions. An important property of virtual photons is …
View article: Analysis of static Wilson line correlators from lattice QCD at finite temperature with <i>T</i>-matrix approach
Analysis of static Wilson line correlators from lattice QCD at finite temperature with <i>T</i>-matrix approach Open
The thermodynamic T -matrix approach is used to study Wilson line correlators (WLCs) for a static quark-antiquark pair in the quark-gluon plasma (QGP). Selfconsistent results that incorporate constraints from the QGP equation of state can …
View article: Hadronization of Heavy Quarks
Hadronization of Heavy Quarks Open
Heavy-flavor hadrons produced in ultra-relativistic heavy-ion collisions are a sensitive probe for studying hadronization mechanisms of the quark-gluon-plasma. In this work, we survey how different transport models for the simulation of he…