Doubly heavy tetraquarks $(QQ\bar{q}\bar{q})$ states with two heavy quarks and two light antiquarks have been actively discussed for a long time. Among them, a doubly charmed tetraquark $T_{cc}^+$ was reported by the LHCb Collaboration in 2022: A narrow peak appears in the $D^0D^0\pi^+$ mass spectrum around 273 keV below the $D^{*+}D^0$ threshold, with its isospin $I$,spin $J$, and parity $P$...
We present a partonic cut-vertex analysis of multihadron fragmentation and dihadron fragmenting jet functions. The multihadron measurement is kept explicitly at the cut-vertex level, allowing the momentum-fraction dependence of the corresponding fragmentation functions to be derived from the factorized phase space rather than imposed by analogy with the single-hadron case. This provides a...
We investigate the critical temperature of a relativistic Bose-Einstein condensate of charged bosons driven by rotation in a parallel magnetic field [\textcolor{blue}{Y. Liu and I. Zahed, Phys. Rev. Lett. {\bf120}, 032001 (2018)}].
For non-interacting bosons, the critical temperature can only be determined for a system with fixed angular momentum. We find that the critical temperature of...
The QGP(Quark-Gluon Plasma) and the QCD phase transition from/to the hadronic phase are one of the hottest topics in high energy nuclear physics. In particular, the dense matter study via nuclei collisions at $\sqrt{s_\mathrm{NN}} \simeq 5 - 10 \, \mathrm{GeV}$ is expected to bring more detailed information on the 1st order phase transition, whereas the hot matter study through nuclei...
Heavy quarkonium production can be described as perturbative heavy quark-antiquark pair production and nonperturbative hadronization. Studying quarkonium production inside jets provides insight into quarkonium evolution in the nonperturbative process, which can be characterized by the jet fragmentation fraction of the quarkonium transverse momentum with respect to the enclosing jet. LHCb...
The interaction of jets with the color-deconfined QCD medium in relativistic heavy-ion collisions provides crucial insights into the properties of the quark-gluon plasma (QGP). Conventionally, these interactions are studied by measuring modifications in jet observables with respect to proton-proton baselines. Deep learning methods allow us to evaluate the modification of jets on a jet-by-jet...
Angular correlations between heavy quarks provide an important way to study the quark–gluon plasma (QGP) created in high-energy heavy-ion collisions. Current LHC measurements have reported azimuthal correlations of muons from semileptonic heavy-quark decays in 5.02 TeV Pb+Pb and pp collisions, with $p_{T}^{\mu} > 4 GeV $ and $|\eta^{\mu}| < 2.4$~\cite{ATLAS:2024}.All $\Delta \phi $...
Photon-induced processes in ultraperipheral collisions provide a clean probe of nuclear and particle dynamics, with azimuthal modulations offering particular sensitivity to the polarization and interaction mechanisms of quasi-real photons.Motivated by recent STAR measurements, we study azimuthal asymmetries in $\pi^+$ $\pi^-$ production near $f_2(1270)$ resonances in ultraperipheral Au+Au...
In recent years, the quark-gluon plasma (QGP) formed in high-energy heavy-ion collisions has been extensively studied within the framework of relativistic viscous hydrodynamics. One of the most investigated properties of this extreme matter is the transport coefficients, including shear viscosity, bulk viscosity, and baryon diffusion coefficient. While the shear and bulk viscosities have been...
We present a Bayesian holographic model constructed by integrating the equation of state and baryon number susceptibility at zero chemical potential from lattice QCD. The model incorporates error estimates derived from lattice data. With this model, we systematically investigate the thermodynamic properties of the 2+1-flavor QCD system. Using Bayesian Inference, we perform precise calibration...
Quantifying the path-length and flavor dependence of parton energy loss is essential for converting jet quenching measurements into microscopic constraints on the transport properties of deconfined QCD matter. In our previous study~[1], using $R_{\mathrm{AA}}$ data for different hadron species within a fixed collision centrality, we simultaneously extracted the parton energy loss of gluons...
This contribution presents the characterisation and the radiation-tolerance evaluation of MOSAIX, the wafer-scale monolithic active pixel sensor developed for the ALICE ITS3 upgrade. During LHC Long Shutdown 3, ITS3 will replace the three innermost layers of the Inner Tracking System with thin, bent, wafer-scale sensors, substantially reducing the material budget and bringing these layers...
High-energy nuclear collisions provide a unique environment to study isospin transport in strongly interacting QCD matter. While the strong interaction approximately conserves isospin, collisions involving nuclei with different neutron-to-proton $(N/Z)$ ratios offer a direct way to investigate how the initial isospin of the system is reflected in final-state hadron production....
In heavy-ion collisions, strong acceleration can generate an effective temperature via the Unruh effect,$T_U=a/(2\pi)$, which may reach the QCD scale. We study chiral symmetry breaking under acceleration and rotation using effective models. The predicted phase diagram depends on the renormalization scheme: subtracting the Rindler vacuum renders the critical temperature...
Studies of QCD phase transition and critical signals are often conducted under spatially uniform temperature conditions. The influence of spatially varying temperature on the phase transition signals in the fireball at the collider has not yet been fully explored [1].
Based on an Ising-like effective potential, we study the locally equilibrated systems with spatially non-uniform...
In relativistic heavy-ion collisions, the relative motion of heavy quarkonium with respect to the quark-gluon plasma (QGP) induces spin alignment. Our previous work attributed this to a repopulation of quarkonium's spin components, an effect rooted in the spin degree of freedom. Here we reveal a complementary mechanism, which operates at the orbital level: the relative motion between...
The Cooling-storage-ring External-target Experiment (CEE) is a large-acceptance spectrometer designed for the study of nuclear matter under extreme conditions in heavy-ion collisions at intermediate energies. A reliable detector alignment and track-matching procedure is essential for the reconstruction of charged particles and for subsequent physics analyses.
In this work, we present the...
By combining Lattice QCD data with physics-informed machine learning (PIML), we investigate the behavior of the coupling constant and the quark anomalous magnetic moment (AMM) within the Nambu–Jona-Lasinio (NJL) model under a magnetic field. We train a neural network using Lattice QCD data and the analytical expression of the thermodynamic potential in the NJL model as core constraints. This...
We present the first comprehensive study of dilepton production from a hot, magnetized quark
gluon plasma in heavy-ion collisions (HIC), incorporating realistic, time-dependent, and spatially
inhomogeneous magnetic field profiles within an analytically solvable Gubser flow background. This
framework provides a significant improvement over previous static calculations with...
In high-energy nuclear collisions, numerous phenomenological analyses have been conducted regarding the Quark-Gluon Plasma (QGP) as it reaches local thermal equilibrium. In these studies, it is crucial to understand the extent to which the QGP is actually generated as a transient state of the collision. While the QGP component is dominant in large collision systems such as Pb+Pb, it remains...
We calculate the electrical conductivity of the quark-gluon plasma (QGP) state using the Arnold-Moore-Yaffe (AMY) effective kinetic theory, incorporating nonperturbative inputs via the medium distribution functions and the elastic scattering kernel. The calculation is performed for the $(2+1)$-flavor system over the temperature range $0.8\leq T/T_c\leq2.2$, relevant for the deconfined matter...
The search for quark–gluon plasma (QGP)-like collectivity in small collision systems remains a central goal of high-energy nuclear physics. Recent results from O$+$O collisions suggest that strongly coupled, near-perfect-fluid behavior may emerge even in such small systems, motivating a detailed investigation of jet quenching in systems of reduced size. In this work, we study hadron and jet...
A central challenge in jet-quenching phenomenology is consistently modeling the transition from high-virtuality, vacuum-like parton showers to the transport of hard partons through the quark-gluon plasma (QGP). In multistage frameworks, this boundary is commonly parametrized by a matching scale $Q_0$, which has traditionally been constrained only indirectly through inclusive hadron and jet...
Generative models have demonstrated potential in accelerating Monte Carlo sampling for physical simulations, yet their capability to handle strongly correlated point cloud data, such as atomic nuclei structures, remains unclear, which directly affects their reliability in nuclear physics simulations. Taking the oxygen-16 nucleus as an example, this paper systematically evaluates the...
The Electron-Ion Collider (EIC) ePIC experiment will employ a Barrel Time-of-Flight (BTOF) detector based on AC-LGAD sensors, which provide excellent time and spatial resolution. The BTOF extends approximately 260 cm along its longitudinal direction. The full length of the BTOF is covered by two FPCs, each approximately 130 cm long. The FPCs are required to have a low material budget in order...
Nucleon-nucleon short-range correlations (SRC) provide a unique window into the short-distance behavior of the nuclear force and beyond-mean-field dynamics in nuclear many-body systems. They generate a universal high-momentum tail in the nuclear momentum distribution and are dominated by neutron-proton pairs [1,2]. In this poster, we explore a new experimental approach for probing these...
The suppression of quarkonium production in heavy-ion collisions has long been recognized as a key signature of QGP formation, reflecting the medium’s temperature and color-screening properties. However, interpreting the observed nuclear modification factor ($R_{AA}$) remains challenging due to the interplay between hot-medium effects, including dissociation and regeneration, and cold nuclear...
It has recently been realized that in the ultra-central heavy-ion collisions, mean transverse momentum of hadrons contains the information of the fundamental thermodynamic properties of quark-gluon plasma (QGP). In particular, in nucleus-nucleus collisions, the linear correlation between the mean transverse momentum and the charged multiplicity is attributed to the QCD speed of sound, which...
The speed of sound, $c_s$, reflects the thermodynamic properties of the quark–gluon plasma produced in relativistic heavy-ion collisions. In ultracentral collisions, recent studies have conjectured that $c_s^2$ can be extracted from the logarithmic dependence of the mean transverse momentum, $\langle p_T\rangle$, on the charged-particle multiplicity, $\langle...
In non-central heavy-ion collisions, a strong magnetic field is created for a very short time. Even though it does not last long, it can shape the early dynamics so that matter forms clustered substructures along the axis parallel to the field, giving an uneven (inhomogeneous) density distribution. This inhomogeneity may survive afterward as a long-lived, metastable state, sometimes called...
The event-by-event correlation between net baryon and net strangeness is expected to be sensitive to the system temperature and the degrees of freedom. Measurements of the second-order BS correlation have been reported from the BES-II program by the STAR collaboration [1], where the experimental results are consistent with both the lattice QCD and HRG calculations. Measuring the higher-order...
Heavy-ion collisions provide a unique laboratory for studying hyperon-nucleon (Y-N) interactions and the possible existence of exotic bound states via two-particle momentum correlations. Using the Lednický-Lyuboshitz model, we extract source sizes and interaction parameters from the measured correlation functions, enabling constraints on the space-time structure of the particle source and the...
A key objective of high-energy nuclear physics is the search for the onset of gluon saturation phenomena in the limit of extreme gluon densities. Photon-induced vector meson production in ultraperipheral heavy-ion collisions (UPCs) offers a unique and powerful probe of the gluon distribution in nuclei. The $\phi$ meson, with its mass around 1 GeV, lies at the boundary of hard scales between...
High-transverse-momentum charged hadrons probe jet--QGP interactions, yet sizable suppression persists in highly peripheral heavy-ion collisions, where final-state energy loss should be weak. We factorize the nuclear modification factor as $R_{\mathrm{AA}}=R_{\mathrm{AA}}^{\mathrm{bias}}R_{\mathrm{AA}}^{\mathrm{med}}$, separating initial-state geometric bias from medium modification. A...
We propose a Generalized Bessel--Power Distribution (GBPD) for the event-by-event initial eccentricity in nucleus--nucleus collisions. In addition to the conventional fluctuation and geometric-anisotropy parameters, the GBPD introduces a radial-shape exponent $k$ that quantifies deviations from the standard quadratic Power form and encodes non-Gaussian eccentricity fluctuations. We show that...
Significant global polarization of $\Lambda$ hyperons along the direction of the orbital angular momentum has been measured in non-central heavy-ion collisions where the equation of state (EOS) of the produced dense matter is expected to change from intermediate to low colliding energies. We study the sensitivity of the global $\Lambda$ polarization to EOS in heavy-ion collisions within the...
Net-proton cumulants in the Beam Energy Scan (BES) region of heavy-ion collisions are widely used to probe critical fluctuations associated with the conjectured critical endpoint of Quantum Chromodynamics (QCD). Most existing studies, however, concentrate on the initial-state or phase-transition contributions, while the impact of hadronic rescattering on these observables has not been fully...
The hadronic tensor encodes crucial information regarding the internal structure of hadrons, reflecting the non-perturbative features of quantum chromodynamics (QCD). In this work, we directly compute the hadronic tensor within (1+1)-dimensional $\rm U(1)$ and $\rm SU(2)$ gauge theories by evaluating real-time current-current correlation functions. Utilizing quantum algorithms executed on...
We calculate the cross section for the heavy quark $(Q)$ production through gluon $(g)$ fusion process $g+g\to Q+\bar{Q}$ in the presence of a weak external magnetic field $(B)$. Several studies have estimated the $B$ field strength in non-central heavy-ion collisions to be $eB\sim m_\pi^2\sim 10^{18},\text{G}$. Thus, for heavy flavour mass $m_Q$, the inequality $m_Q^2 \gg eB$ is largely...
Recent observation of collective phenomena in small colliding systems challenged conventional criteria for Quark-Gluon Plasma (QGP) formation and underscored the need for transport approaches capable of describing far-from-equilibrium dynamics. In this work, we employ heavy-flavor (HF) jet tomography to probe the short-lived medium created in proton-proton collisions at LHC energies. On an...
In this talk, we investigate high-order temperature fluctuations within a multi-charge Einstein--Maxwell--Dilaton holographic model with flavor-dependent $u$, $d$, $s$ sectors, calibrated by lattice QCD results. We extract the fluctuation observables $c_n$ ($n = 2, \dots, 6$) from high-order temperature derivatives of the pressure along realistic freeze-out trajectories with multiple conserved...
High-energy nuclear collisions can image the intrinsic shape of the colliding nuclei through the hydrodynamic response of the produced medium. Mean transverse momentum $\left[p_{\rm{T}}\right]$ fluctuations probe this geometry primarily through radial flow, since $\left[p_{\mathrm{T}}\right]$ correlates with transverse size of the overlap region [1,2]. Cumulants of...
Traditional Monte Carlo Glauber models[1] treat deformed nuclei using a classical approximation: in each event, a fixed orientation is randomly assigned to the nucleus, which effectively breaks the rotational symmetry. However, for even-even nuclei, the ground state must remain in the $J=0$ ground state. To restore this broken symmetry, we introduce quantum superposition over all possible...
Event-by-event mean transverse momentum fluctuations (⟨pT⟩) provide a sensitive probe of the initial-state energy-geometry and transverse-size fluctuations and their conversion into collective dynamics in relativistic heavy-ion collisions. We present a systematic study of second-order mean-pT fluctuations in Au+Au collisions at √sNN = 3.0–19.6 GeV using the updated Jet AA Microscopic Transport...
The three-dimensional structure of the nucleon is encoded in transverse momentum dependent parton distribution functions (TMD PDFs), among which the Sivers function describes the correlation between the transverse momentum of partons and the transverse spin of the proton. Dijet production in transversely polarized proton collisions provides a unique probe of the initial-state partonic...
Jet quenching provides a sensitive probe of the transport properties and microscopic structure of the quark-gluon plasma (QGP). In this work, we use the Linear Boltzmann Transport (LBT) model to study jet-medium interactions from two complementary perspectives: photon-tagged jet observables in different collision systems and multi-point energy correlators inside jets.
The first part focuses...
We investigate a rotating quantum system subjected to a co-aligned external magnetic field. The gauge-invariant kinetic angular momentum is of particular importance because as the thermodynamic conjugate of the angular velocity, it determines the equilibrium state. Its relevance is further motivated by experimental observations of extreme fluid vorticity in heavy-ion collisions. We develop a...
We investigate the late-time asymptotic solutions and attractor structure of the spin density in minimal causal spin hydrodynamics in Gubser flow. After deriving the differential equation governing the spin density, we obtain its late-time asymptotic solutions and identify both attractors and repellers in the corresponding numerical solutions. We then map these solutions back to flat Minkowski...
The rapid longitudinal expansion in the early stage of relativistic heavy-ion collisions drives the system far from equilibrium, generating large pressure anisotropies that challenge standard viscous hydrodynamics (VH). Viscous Anisotropic Hydrodynamics (VAH) addresses this by non-perturbatively resumming these anisotropies and has shown phenomenological success in describing flow observables....
A newly proposed observable, $v_0$, and its transverse-momentum-differential
form, $v_0(p_T)$, is designed to quantify event-by-event variations in the spectral shape
associated with radial-flow fluctuations[1-4]. This observable is sensitive to
the equation of state (EoS) of the medium, and several phenomenological studies have
identified it as a potential signature of partonic...
Transverse $\Lambda$ polarization in hadron-hadron and hadron-nucleus collision has been observed for over fifty years, yet its origin remains poorly understood. The fragmentation process, characterized by polarizing fragmentation functions (pFFs), has been proposed as a potential origin of this phenomenon. This mechanism can be probed via measurements of the $\Lambda$ polarization within...
Transversely polarized $\Lambda$-hyperons were observed in unpolarized p+p and p+A collisions more than 50 years ago. However, the underlying mechanism remains poorly understood. Such measurements in heavy-ion collisions will advance our understanding of the origin of transverse polarization and its connection to global polarization.
In this talk, we present the measurements of transverse...
Hypernuclei, bound states consisting of nucleons and hyperons, provide a unique opportunity to study the hyperon-nucleon ($Y$-$N$) interaction and the role of strangeness in nuclear matter. Because free hyperon targets are unavailable and hyperon–nucleon scattering data are limited, hypernuclei provide an important means of constraining hyperon–nucleon interactions. Measurements of hypernuclei...
Strange hadrons are sensitive probes of the properties of baryon-rich
nuclear matter created in heavy-ion collisions. At collision energies near their corresponding nucleon-nucleon production thresholds, their kinematic distributions and yield ratios may help constrain the equation ofstate (EoS) of high-baryon-density matter.
In this talk, we will present measurements of strange hadrons...
Based on the microscopic Brueckner–Hartree–Fock (BHF) approach, we systematically investigate the medium modifications of nucleon–nucleon (NN) scattering cross sections and their applications in transport simulations of heavy-ion collisions. By accurately treating the total momentum K of the colliding nucleon pair, the in-medium NN cross sections are calculated at different densities and...
Small collision systems, such as high-energy proton-proton (pp) collisions, have attracted considerable attention following the observation of QGP-like phenomena, including strangeness enhancement and collective flow. These observations have motivated extensive studies of the underlying event (UE) to better understand the microscopic origin of particle production in high-multiplicity events....
Ultra-peripheral Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm{NN}}}=200~\mathrm{GeV}$ at RHIC provide a controlled setting for investigating nuclear-structure effects in the photonuclear production of forward neutrons. Although the two isobars have the same mass number, they differ in proton number and photonuclear response, making their neutron-tagged Coulomb-dissociation cross-section...
We study the dynamics of heavy quarks in the quark-gluon plasma in the presence of non-Markovian memory effects using a generalized Langevin framework. Time-correlated thermal noise with a power-law decay is generated through a fractional differential equation formulated in terms of the Caputo fractional derivative of order $\nu$. The role of memory is analyzed through several dynamical...
We investigate the nonlinear response of flow harmonics v2, v4 to initial-state eccentricities ϵ2, ϵ4 within the Gubser-flow framework. By extending the perturbative solutions of Gubser flow, we derive analytic nonlinear response relations connecting the eccentricities ϵ2, ϵ4 to the flow harmonics v2, v4. Our results reproduce the well-known result v4/v2
2 → 1/2 in large transverse momentum...
The chiral magnetic effect (CME) in relativistic heavy-ion collisions induces a charge separation along the magnetic field, yet its detection is obscured by large backgrounds, especially from local charge conservation (LCC). Using event-by-event AVFD simulations of Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV, we studied machine-learning strategies to enhance CME discrimination.
First, we...
The orientational treatment of deformed nuclei in high-energy collisions admits two distinct pictures---a classical rigid rotor and quantum symmetry restoration---that construct the laboratory many-body densities differently; a central difficulty of current studies is the lack of probes that can discriminate between them.
We develop a framework for computing laboratory one- and two-body...
The photon radiation induced by rescattering in a magnetized medium is investigated in relativistic heavy-ion collisions. Within the high-energy limit, the photon emission rate and the associated electromagnetic energy loss are derived using the Gyulassy-Levai-Vitev formalism at first order in opacity, for a quark jet propagating through a quark-gluon plasma along a background magnetic field....
Directed flow $v_1$ and particle yield ratios provide complementary probes of
particle-production mechanisms and the evolution of baryon-rich QCD matter. The $\phi$ meson, with its hidden-strangeness $(s\bar{s})$ structure, long lifetime, and limited late-stage rescattering, is a sensitive probe of early collective dynamics.
In this talk, we report measurements of $\phi$-meson yields...
We investigate the differential $\Lambda\bar{\Lambda}$ spin correlation in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV using AMPT supplemented with a chiral anomaly transport (CAT) module. The CAT module incorporates hyperon polarization induced by thermal vorticity, shear effects, and a finite axial chemical potential $\mu_{5}$. The dynamical framework is constrained through comparisons with...
In non-central heavy-ion collisions, ultra strong magnetic fields can be generated by the nuclear fragments. The fluctuations of these electromagnetic fields, originating from event-by-event variations in the initial nucleon distributions, were proposed in Refs. [1, 2]. In this talk, I present our recent study of the impact of the electromagnetic-field fluctuations on the charge-dependent flow...
Recent O+O and Ne+Ne collisions at the LHC provide a controlled laboratory to test the applicability of relativistic hydrodynamics and search for signatures of quark-gluon plasma formation in small systems. We study O+O and Ne+Ne collisions at $\sqrt{s_{\mathrm{NN}}}=5.36~\mathrm{TeV}$ using two complementary approaches.
First, we compare viscous anisotropic hydrodynamics (VAH) with...
Recent ALICE and ATLAS measurements have established groomed jet splitting angles as sensitive probes of jet-medium interactions in the quark-gluon plasma (QGP)~\cite{ATLAS:2022qef,ALICE:2021jid}. In particular, ATLAS observed that large-$r_g$ jets are roughly twice as suppressed as small-$r_g$ jets in central Pb+Pb collisions~\cite{ATLAS:2022qef}, suggesting stronger energy loss for wider jet...
Jets recoiling against a $Z^{0}$ or $W^{\pm}$ boson acquire longitudinal polarization owing to the parity-violating nature of the weak interaction. Weak-boson-tagged processes therefore provide a unique opportunity to study the hadronization and medium modification of polarized partons without requiring polarized incoming beams. In this work, we calculate the longitudinal polarization of...
In ultra-peripheral heavy-ion collisions (UPCs), vector mesons are coherently photoproduced from two spatially separated yet quantum-mechanically indistinguishable nuclei. The coherent superposition of the two production amplitudes leads to production-site entanglement, resulting in measurable spin-interference patterns in the angular distributions of the decay products.
In this...
Exotic muonic atoms have long provided precision tests of QED and nuclear structure, yet no muonic system containing a strange quark had been explored until now. In this talk, we present a concerted theoretical and experimental investigation of muonic kaon atoms, the first muonic bound states involving strangeness. We develop a framework for $K\mu$ formation in semileptonic $D^{0}$ decays...
In relativistic heavy-ion collisions, a large number of light nuclei can be produced. Studying the production mechanism of light nuclei can help us understand the evolution process of relativistic heavy-ion collisions. There have been numerous studies on stable light nuclei, while research on unstable light nuclei is still relatively lacking. Unstable light nuclei are fragile resonance states,...
The CEE experiment at HIRFL-CSR is designed to investigate dense nuclear matter and the QCD phase structure at high baryon density through heavy-ion collisions at intermediate energies. The MWDC array serves as the forward tracking system, providing charged-particle trajectory reconstruction and contributing to event-plane measurements.
The CEE-MWDC system has progressed from detector...
Quark jets are powerful probes of the matter created in ultrarelativistic heavy-ion collisions, from the dense gluon fields of the initial-stage Glasma to the hot quark-gluon plasma. In this talk, I present our recent progress on developing a non-perturbative computational framework for in-medium jet evolution based on the light-front QCD Hamiltonian approach. By treating the jet as a fully...
Hyperon polarization observables are unique and important tools to study QCD spin dynamics, including spin transfer during hadronization, and the complex vortical structures of the QGP. With the high-statistics data collected by the CMS experiment, we present the measurements of polarization along the beam direction ($P_z$) for $\Lambda$ and $\bar{\Lambda}$ particles in pPb collisions at...
Abstract：
The Cooling Storage Ring (CSR) External-target Experiment (CEE) is a large-scale nuclear physics experiment constructed at the Heavy Ion Research Facility in Lanzhou (HIRFL-CSR). It aims to investigate the Quantum Chromodynamics (QCD) phase diagram at high baryon density, the nuclear equation of state, and physics related to compact astrophysical objects. As the central tracking...
A reliable description of direct CP asymmetries in hadronic $B$ decays, among the most sensitive probes of the CKM mechanism and of physics beyond the Standard Model, remains unresolved. Conventional factorization approaches adopt distinct treatments for the strong phases originating from long-distance QCD interactions, leading to predictions that differ by factors of several for identical...
We study charge transport in a magnetized relativistic plasma using kinetic theory within the relaxation-time approximation. By exactly solving the linearized Boltzmann equation in a uniform magnetic field, we obtain an analytic solution for the distribution function in terms of Bessel functions. Using this solution, we compute the full set of retarded current-current correlators and verify...
During non-central ultra-relativistic heavy-ion collisions, the colliding nuclei carry a large global angular momentum. A part of this angular momentum is believed to be transferred to the quark-gluon plasma (QGP) medium leading to the spin polarization/alignment of the final state particles such as $\Lambda, K^{*}, \phi$. While the spin polarization of $\Lambda$ hyperons along global angular...
The hidden-charm pentaquark candidates observed in the
(J/\psi p) invariant-mass spectrum provide an important opportunity to
investigate the interplay between hadronic molecular dynamics and compact
multiquark configurations. We study these structures using a spin-resolved
coupled-channel model for the decay
(\Lambda_b\to K^-J/\psi p). The calculation incorporates the...
Relativistic hydrodynamics successfully describes bulk observables in symmetric heavy-ion collisions, but struggles to reproduce charged-particle rapidity distributions in asymmetric systems such as d+Au collisions. To address this challenge, we introduce two key improvements to the initial-state modeling: sampling deuteron configurations from an ab initio wavefunction, and developing a new...
The spin polarization of $\Lambda$ hyperon in low-energy Au-Au collision can be generated from the nonlocal nucleon-nucleon scattering. The Lagrangian of baryon-meson interaction is obtained from the chiral perturbation theory, and we introduce a wave packet for the incoming nucleons to describe the nonlocal collision. We evaluate the spin dependent cross sections with the approximations that...
Thermal dileptons serve as ideal probes for studying the properties of the quark-gluon plasma (QGP) created in heavy-ion collisions. In particular, the dilepton production rate is directly proportional to the in-medium spectral function of the electromagnetic current, so that the invariant-mass spectra of dileptons encode both the temperature evolution and the microscopic structure of the...
The observation of spin polarization in non-central heavy-ion collisions has opened new directions in the development of relativistic hydrodynamic theories. Many theoretical frameworks have been developed to explain the phenomenon of polarization of the detected hadrons. One such framework is spin hydrodynamics, in which spin degrees of freedom, or equivalently the total angular momentum, are...
Transverse polarization of $\Lambda$ hyperons in unpolarized hadronic collisions has been studied since its discovery. While significant polarization has been observed in small collision systems such as p+p and p+A collisions, its underlying mechanism is still not fully understood. This transverse polarization is conventionally measured for each $\Lambda$ candidate with respect to its...
Two loop thermodynamic equation of state (EOS) at finite chemical potential is studied at one stable droplet size. Due to the presence of the chemical potential in two loop correction, formation of bubble/droplet of quark gluon plasma (QGP) is modified, and at this particular stable droplet the thermodynamic parameters such as pressure, energy density, interaction measurement, entropy,...
The Electron–Ion Collider (EIC), planned to be constructed at Brookhaven National Laboratory in the United States, aims to explore the strong interaction and the internal structure of nucleons. The Zero Degree Calorimeter (ZDC), which is one of the detector components at the ePIC experiment at the EIC, plays an essential role in several EIC physics programs, including the distinction between...
