Conveners
Parallel II: Spin polarization & Chirality I
- 德富 侯 (CCNU)
Parallel II: Spin polarization & Chirality II
- 庆华 徐 (Shandong University)
Parallel II: Heavy Flavor I
- 泽波 唐 (University of Science and Technology of China)
Parallel II: Heavy Flavor II
- 云 郭 (广西师范大学)
Parallel II: Heavy Flavor III
- 剑辉 朱 (Fudan University)
Parallel II: Strangeness
- 王妹 查 (中国科学技术大学近代物理系)
While the spin polarization of hyperons and the spin alignment of vector mesons become a hot topic in relativistic heavy-ion collisions, the spin dynamics in intermediate-energy heavy-ion collisions has attracted little attention. Starting from the spin-dependent Boltzmann-Vlasov equation, we have derived the spin-dependent equations of motion for nucleons, and developed a spin- and...
Neutral and charged vector mesons can exhibit sensitivity to isospin-violating phenomena arising from Landau level splitting when a strong magnetic field ($B$) is present in a QCD medium [1]. A possible case involves the neutral $K^{*0}$ ($d\bar{s}$) and the charged $K^{*+}$ ($u\bar{s}$), which are close in mass and share the same isospin, yet their constituent quarks possess different...
We have implemented the 3+1 dimensional CLVisc hydrodynamics model with \trento-3D initial conditions to investigate the spin polarization of $\Lambda$ hyperons along the beam direction in p+Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV. Following our previous theoretical framework based on quantum kinetic theory, we consider three different scenarios: $\Lambda$ equilibrium, $s$ quark...
Ultra-relativistic nuclear collisions create the quark–gluon plasma (QGP) known as the hottest, least viscous, and most vortical fluid ever produced in terrestrial laboratories. Its vortical structure has been uncovered through the spin polarization of Lambda ($\Lambda$) hyperons, attributed to the spin–orbit coupling that transfers the system’s orbital angular momentum to the quark spin,...
In this talk, we demonstrate how quantum kinetic theory governs chiral and spin effects in global equilibrium. By extending the framework from constant to varying electromagnetic fields, we show that previously undetermined chiral and spin effects induced by vorticity and electromagnetic fields can now be further pinned down.
We discuss Dirac fermions under the coexistent rotation and strong magnetic field called the magnetovortical matter. The partition function for this system is constructed based on thermodynamic stability and gauge invariance [1]. We show that the orbital contribution to bulk thermodynamics dominates over the conventional contribution from anomaly-related spin effects found in Ref. [2]. This...
The detection of the Chiral Magnetic Effect (CME) in relativistic heavy-ion collisions remains challenging due to substantial background contributions that obscure the expected signal. In this Letter, we present a novel machine learning approach for constructing optimized observables that significantly enhance CME detection capabilities. By parameterizing generic observables constructed from...
In relativistic high-energy heavy-ion collisions, the chiral magnetic effect (CME) could produce a charge separation in quark gluon plasma (QGP) and remain in the final hadron system during evolution, observed as the correlator . However, in collisions, the background effect makes a significant contribution. Therefore, we propose to study the contribution of CME to through collisions.
We...
Quantum Chromodynamics (QCD), the fundamental theory of the strong interaction, governs the behavior of quarks and gluons. Heavy quarks (charm and bottom) hold unique value in strong interaction research: their large masses ensure production is dominantly governed by perturbative QCD, while the formation mechanisms of heavy quarkonium states (e.g., J/ψ) inherently span QCD's perturbative and...
Within the framework of a Langevin dynamics model for heavy quarks in a hot and dense medium, combined with a sequential coalescence +fragmentation hadronization scenario which let the $D_{\rm s}$ meson produced earlier than the other hadron, we systematically calculate the Pb+Pb yield spectra of $D_s$, $D^0$, and $\Lambda^+_{c}$, the yield ratios $D_s/D^0$ and $\Lambda^+_{c}/D^0$, and their...
In this talk, I will introduce our recent work on the productions of charmonium and exotic hadrons in pp collisions at the LHC energies as well as in $e^+e^-$ collisions at the BESIII energy using the PACIAE model.
We present a machine learning–based framework for modeling temperature-dependent non-perturbative quantities in the quark-gluon plasma (QGP), aimed at improving predictions for heavy quarkonia suppression in high-energy nuclear collisions. Deep neural networks are trained on lattice data to extract temperature profiles of the Debye screening mass $m_D(T)$ and the QCD running coupling...
We present a comprehensive investigation of the heavy quarkonium dynamics in the quark-gluon plasma (QGP), including the dissociation caused by dynamical scatterings off the medium partons and the regeneration from the unbound single heavy quarks. The dissociation cross sections and transition rates for both 2->2 leading-order (gluo-dissociation) and 2->3 next-to-leading order (partonic...
Quarkonium production provides a powerful probe of the deconfinement of strongly interacting matter in high-energy heavy-ion collisions. Because the binding potential of heavy quark--antiquark pairs is screened in the quark--gluon plasma (QGP), measurements of quarkonium yields and polarization can reveal the onset and properties of this deconfined medium. For the J/$\psi$ meson, a bound...
In high-energy proton-proton (pp) collisions at the LHC, non-prompt charm hadrons, originating from beauty hadron decays, provide a valuable probe for beauty quark dynamics, particularly at low transverse momentum ($p_T$) where direct beauty measurements are challenging. We employ the A Multi-Phase Transport (AMPT) model in its string-melting mode to simulate these processes in pp collisions...
We present the first calculation of charmed baryon decay constants using 2+1 flavor gauge ensembles with lattice spacings ranging from 0.05 to 0.1 fm and pion masses between 136 and 310 MeV. Under SU(3) flavor symmetry, we construct the charmed baryon interpolating operators and compute the corresponding hadronic matrix elements to extract the bare decay constants for each ensemble. The...
In relativistic heavy-ion collisions, the production of J/$\psi$ serves as an important probe for studying the properties of quark-gluon plasma (QGP). However, interpreting the modi-fication of J/$\psi$ yields is challenging due to the interplay of hot, such as dissociation and regeneration, and cold nuclear matter effects. Measuring J/$\psi$ production across various collision systems and...
At leading order in QCD coupling constant, we compute the energy loss per traveling distance of a heavy quark $dE/dz$ from elastic scattering off thermal quarks and gluons at a temperature $T$, including the thermal perturbative description of soft scatterings and a perturbative QCD-based calculation for hard collisions. We re-derive the analytic formula for $dE/dz$ in the high-energy...
Heavy quark production in high-energy collisions is a sensitive probe of QCD and nuclear matter effects. Open heavy-flavor hadrons and quarkonium states provide complementary insights into initial-state effects, such as nuclear parton distribution modifications and parton energy loss, as well as final-state effects like medium interactions and possible Quark-Gluon Plasma (QGP) formation....
We study the S-wave interactions between the nucleon ($N$) and the triply charmed Omega baryon ($\Omega_{\mathrm{ccc}}$) using (2+1)-flavor lattice QCD with a physical pion mass ($m_\pi \simeq 137.1$ MeV) on a lattice volume $\simeq (8.1~\mathrm{fm})^3$.
The charm quark is implemented with a relativistic heavy-quark action at its physical mass.
Employing the time-dependent HAL QCD method,...
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 energy and large collisional widths of the partons poses formidable challenges in evaluating the in-medium properties of hadronic states and their eventual...
Both ALICE and CMS collaboration report precision measurements of nuclear suppression and collective flow of heavy flavor hadrons at low and intermediate transverse momentum region in PbPb collisions, which drives the theoretical development of the non-perturbative scatterings between heavy quarks and QGP medium. Aim at this, we have improved the LBT model by re-evaluating the heavy quark...
We study the productions of $\Lambda$-hypernuclei $^3_{\Lambda}$H, $^4_{\Lambda}$H, $^4_{\Lambda}$He and $\Omega$-hypernuclei $H(p\Omega^-)$, $H(n\Omega^-)$, $H(pn\Omega^-)$ in the coalescence mechanism in relativistic heavy-ion collisions. Considering the abundance and great importance of baryons and light (hyper-)nuclei on the collision dynamics, we include not only nucleon$+\Lambda$...
The $\Lambda$ binding energy difference, which is called the charge symmetry breaking in the ground states of a pair of A = 4 hypernuclei, ${\rm _{\Lambda}^4H}$ and ${\rm _{\Lambda}^4He}$, was measured to be $\Delta B_{\Lambda}^4(0_{g.s.}^{+})\approx 350~$keV in nuclear emulsion experiments in the 1970s. In the 2015 and 2016 experiments from J-PARC and A1 collaboration, the binding energy...
Hypernuclei are bound nuclear systems of nucleons and hyperons. The hypernuclei production mechanism in heavy-ion collisions remains not fully understood. In particular, the hypertriton ($^3_\Lambda\mathrm{H}$), a bound state consisting of a proton, neutron, and hyperon, is the lightest known hypernucleus with a remarkably small binding energy. Precise measurements of the energy and...
Strange hadrons have been suggested as sensitive probes for the medium properties of the nuclear matter created in heavy-ion collisions. A dense baryon-rich medium is formed during collisions at center-of-mass energies of a few-GeV. Since strange hadrons are produced near or below the threshold, their phase space distribution and yield ratios may provide strong constraints on the equation of...
The production of hypertriton has been proposed as an effective method to study the nucleosynthesis mechanism in high-energy hadronic collisions. Within the coalescence picture, the yield of nulcei are sensitive to the interplay between the source size and the spatial distribution of their internal wave function, whereas in the statistical hadronization framework nuclear structure plays little...
