Conveners
Parallel Session C: Hadrons from heavy-ion collisions 1
- Toru Kojo (KEK)
Parallel Session C: Recent developments in QCD 1
- Daekyoung Kang
Parallel Session C: Hadrons at finite density & temperature 2
- Dong Jo Kim (University of Jyvaskyla (FI))
Parallel Session C: Hadrons at finite density & temperature 3
- Sanghoon Lim (Pusan National University (KR))
Parallel Session C: Hadrons from heavy-ion collisions 2
- Qun Wang (University of Science and Technology of China)
Parallel Session C: Hadrons from heavy-ion collisions 3
- Youngil Kwon (Yonsei University (KR))
A variety of information can be extracted from hadrons observed in high-energy heavy-ion collisions. Thermodynamic properties such as the equation of state and viscosity of the quark matter produced have been discussed based on the collective flow of hadrons. Moreover, recent high-statistics and high-precision experimental results have even enabled discussions on hadronic interactions as well....
The short-range component and density dependence of the ฮN interaction are crucial for understanding hyperons in neutron stars, yet remain poorly constrained experimentally. While the long-range part is limited by the โตฮHe binding energy, short-range uncertainties persist. Large-source-size AA collisions, such as STAR-BESII, are mainly sensitive to the long-range region, whereas the...
Results from RHIC and the LHC have revealed quark-gluon plasma (QGP)-like phenomena not only in heavy-ion (AA) collisions but also in high-multiplicity pp and pโPb systems. These observations challenge traditional theoretical models and blur the line between small- and large-system dynamics.
Short-lived hadronic resonances offer sensitive probes of the medium created in such collisions. For...
Hyperon-antihyperon pairs produced in high energy electron-positron annihilation are promising systems for the study of quantum information properties. We make an analysis of some types of quantum correlations, Bell nonlocality, quantum steering and discord, in hyperon-antihyperon systems produced in electron-positron annihilation through J/\psi decay. The behaviors of these quantum...
The measurement of resonances provides a tool to study the hadronic phase, the phase between chemical and kinematic freeze-out in the evolution of the quark-gluon plasma (QGP). Baryonic resonances, such as $\Xi(1530)^0$ with relatively long lifetime ($\sim$ 22 fm/c), serve as key probes to investigate the rescattering and regeneration effects inside the hadron resonance gas by comparing to the...
We investigate the production of $\phi$(1020) mesons and $\Omega$ (1672) baryons in lead-lead(Pb-Pb) collisions at $\sqrt{s_{NN}}=5.02$ TeV. Thermal partons in the quark-gluon plasma (QGP) are generated based on the blast-wave model while parton showers are created from jet partons generated by HIJING by using a subroutine in PYTHIA. To describe the hadronization process, we employ a hybrid...
Being closely connected to the origin of the nucleon mass, the gravitational form factors of the nucleon have attracted significant attention in recent years. We present the first model-independent determinations of the gravitational form factors of the pion and nucleon at the physical pion mass, using a data-driven dispersive approach. The socalled "last global unknown property" of the...
We present an instanton-vacuum approach to heavyโlight mesons that retains the nonlocal heavy-quark kernel beyond the static limit. Bosonization yields an effective heavy-meson field with momentum-dependent vertices, and the bound state follows from a three-dimensional BetheโSalpeter equation with controlled $1/N_c$ and $1/m_Q$ systematics. We compute decay constants, masses, and radiative...
We develop a framework for evaluating matrix elements of gluon operators between physical states of heavyโlight systems within the instanton vacuum. Starting from the low-energy QCD partition function describing heavy and light quarks in the background of an $N_\pm$ instantonโanti-instanton ensemble, we derive an effective fermionic action that includes the interaction of a heavy and $N_f$...
We present lattice results on the masses and matrix elements of chimera baryons, the fermionic bound states composed of hyperquarks transforming in the fundamental and antisymmetric representations of the gauge group in Sp(4) gauge theory. In the context of the composite Higgs model, an extension of the standard model of particle physics, some of these chimera baryons serve as top partners...
It is now firmly established that the gluon propagator in Landau gauge exhibits a mass gap, $m_\textrm{gap}$, originating in the action of the Schwinger mechanism in the gauge sector of QCD. In this work, we show that this mass gap leads to a screening of the gluon in the deep infrared: observables are insensitive to the details of the gluon propagator at momenta below $m_\textrm{gap}$. This...
One of the central goals of high-energy physics is to understand scattering processes and what they reveal about the underlying theory. This is traditionally framed within the $S$-matrix picture, which cannot, in general, be accessed through Euclidean lattice methods. However, with recent advances in quantum technologies and computational methods, the prospect of studying real-time processes...
The observations of the neutron star binary GW170817 detected by gravitational waves and the neutron star observed by NICER provide astronomical constraints on dense matter equation of state (EoS). We anticipate that future astronomical observations will provide more precise constraints on dense matter EoS, and in this presentation, we will discuss the related topics in general.
Understanding the character of the deconfinement phase transition in quantum chromodynamics (QCD) is one of the fundamental challenges in particle physics. On the one hand, for a pure $\mathrm{SU}(N_{\mathrm{c}})$ system at finite temperature, the expectation value of the Polyakov loop $\langle\Phi\rangle$ is the order parameter of the deconfinement phase transition and on the other hand, the...
Masses of the singly heavy baryons (SHBs), composed of a heavy quark and a light diquark, are studied from the viewpoints of heavy-quark spin symmetry (HQSS) and chiral-symmetry restoration at finite temperature. We consider the light diquarks with spin-parity $J^P=0^\pm$ and $J^P=1^\pm$. Medium corrections to the SHBs are provided through the diquarks whereas the heavy quark is simply...
Interacting quantum field theories at finite densities pose significant numerical and conceptual challenges, even with modern computational capabilities. In this talk, I propose a new method, based on an expansion of Euclidean path integrals using radial basis function neural networks, which allows the calculation of observables at finite densities and overcomes the sign problem in a...
We study one-flavor $\mathrm{SU}(2)$ and $\mathrm{SU}(3)$ lattice QCD in $1+1$ dimensions at zero temperature and finite density using matrix product states and the density matrix renormalization group. We compute physical observables such as the equation of state, chiral condensate, and quark distribution function as functions of the baryon number density. As a physical implication, we...
Unlike the widely used Walecka-type models for studying nuclear matter properties and neutron star structures, we extended the linear sigma model, originally developed by Schechter and his colleagues, to the baryonic sector to explore dense nucleon systems. This extended framework is termed the baryonic extended linear sigma model (bELSM).
The bELSM incorporates 2-quark and 4-quark...
The study of hadronic matter at finite density and temperature is important for understanding phenomena ranging from heavy-ion collisions to neutron star interiors and the early universe. In this talk, I will present an overview of the current understanding of the phase structure of strongly interacting matter, focusing on the relevant degrees of freedomโhadrons, quarks, and gluonsโand their...
The $\eta^{\prime}$ meson has a larger mass than the other pseudoscalar mesons in the same nonet of flavor SU(3), due to the effect of the axial U(1) anomaly. Since this effect is closely related to chiral symmetry breaking, various theoretical models predict that the mass of the $\eta^{\prime}$ will decrease significantly in a nuclear medium as chiral symmetry is partially restored.
One of...
We investigate the thermodynamic properties of baryonic excitations in heavy-quark QCD. Based on a lattice QCD formulation with $N_{\rm f}$-flavor Wilson fermions, we derive an expression for the grand potential in terms of loop operators in the hopping parameter expansion (HPE) and the cumulant expansion. Using this grand potential, we analytically compute the baryon number susceptibilities...
We discuss heavy flavor suppression and anisotropic flow at intermediate momentum, where the heavy-quark mass is non-negligible. In relativistic heavy-ion collisions, heavy meson observables are influenced by numerous factors, including heavy-quark interaction with QGP and hadronization. The collisional and radiative energy loss of heavy quarks can be systematically described by a Boltzmann...
Lattice QCD indicates an attractive $N-J/\psi$ interaction with a long-range two-pion exchange tail. To examine this, we use QCD sum rules, extracting the leading dimension-6 four-quark operator that couples to $\pi\pi$ and computing its contribution to the $J/\psi$ mass in nuclear matter. The result is a modest downward shift, smaller in magnitude but qualitatively consistent in sign with the...
Over the past decade, Bayesian inference has become an invaluable tool in heavy-ion collision modeling. By integrating input from both experimental and theoretical perspectives, it bridges two traditionally separate domains. Progress in this framework relies on both high-precision experimental measurements and theoretical developments that yield more accurate predictions. This dual requirement...
We discuss charm-strange mesons in heavy-ion collisions at \sqrt{s_{NN}} = 5.02 TeV, focusing on their production based on the coalescence model. Starting from the investigation on the transverse momentum distribution of both charm and strange quarks, we evaluate the yield and transverse momentum distribution of Ds, Ds, Ds0(2317), and Ds1(2460) mesons. We also present the transverse...
Particles of non-zero spin produced in non-central heavy-ion collisions are expected to be polarized along the direction perpendicular to the reaction plane because of their spin-orbit interactions in the produced matter. In this talk, I will show that the hypertriton, which is the lightest hypernucleus, is also polarized in these collisions. I will demonstrate that the polarization and decay...
The nuclear modification of quarkonium production serves as crucial evidence for the deconfined QCD medium production in nuclear collisions. This modification is influenced not only by medium dissociation but also by a collection of initial and final state effects. The production of excited charmonium states in pPb collisions presents a controlled setting to further investigate these...
Dielectrons from open charm hadron decays provide a promising probe of heavy-quark interaction with the quark-gluon plasma (QGP) in relativistic heavy-ion collisions, and meanwhile constitute a crucial background of the invariant mass spectra of dielectrons from which the temperature of the QGP is extracted. So far, effects of medium modification of heavy quarks on dielectron spectra have been...
The long-range near-side ridge phenomenon in two-particle correlation(โฯ-ฮฮท) provides significant insights into the dynamics of the early stage of collisions, governed by strong interactions. Although the hydrodynamic model describes this ridge structure in heavy ion collisions, this could not offer the enough explanation that ridge phenomenon occurs in the small systems such as pp collisions...
It is important to investigate the in-medium quark condensates to understand the mechanism of the spontaneous breaking of chiral symmetry. The up and down quark condensates in nuclear medium are studied by pionic atoms and low energy pion nucleus scattering. It is found that the magnitude of the ud quark condensates may be reduced by 30% at the nuclear saturation density. This is known as...
In relativistic heavy ion collisions, the collective behaviors of deconfined quarks and gluons characterized by the hadron spectra and flow reveal the formation of quark gluon plasma (QGP), which can be macroscopically described by relativistic hydrodynamics with the transport coefficients governed by the underlying strong interaction. Recent measurements of the global spin polarization of...
Motivated by the apparent hydrodynamic behavior in small systems, we discuss the problem of matching hydrodynamic initial conditions to nucleon structure.
Conceptually, this opens a puzzle, since hydrodynamics is a classical theory, and fluctuating hydrodynamics is a stochastic theory, but nucleon 3D structure is a deeply quantum object, with the ingredients necessary for hydrodynamics not...
Backward production of K*(892) in the $(K^-, p)$ reaction serves as a probe for understanding the underlying reaction mechanisms, particularly the contributions from hyperons such as $\Lambda$ and $\Sigma$ in the u-channel, in addition to the dominant t-channel contribution. High-precision and high-statistics measurements of differential cross-sections and spin-density matrix elements (SDMEs)...
Jet serves as a crucial probe of the Quark-Gluon Plasma (QGP) created in relativistic heavy-ion collisions. While significant efforts have been devoted to developing transport models of jet interactions with the QGP, a simultaneous description of hadron and jet suppression within a unified framework still remains a great challenge. Based on our Linear Boltzmann Transport (LBT) model, we...
