In relativistic heavy-ion collisions, jet substructure observables provide unique access to the interactions between energetic partons and the hot, dense QCD medium known as the QuarkโGluon Plasma (QGP). Among them, the jet invariant mass ($M_{\mathrm{jet}}$) is particularly sensitive to parton virtuality evolution and the pattern of final-state radiation. However, measurements of jets with...
Motivated by color coherence and decoherence effects in the QCD medium, we propose a theoretical framework that combines vacuum-like emissions and medium-induced radiation to study jet quenching and its dependence on jet cone sizes and substructure. In our approach, a jet produced at a hard scale $Q$ first undergoes vacuum-like evolution, as described by the well-established...
In this talk, we study the azimuthal anisotropy of the back-to-back lepton-jet production in polarized lepton-proton collisions.
In particular, we provide the theoretical origins for the dependencies on $\phi_q - \phi_J$ from a factorization formalism derived within the soft-collinear effective theory (SCET) framework.
We further present numerical results for the polarized azimuthal...
In high-energy heavy-ion collisions, high-energy jets produced by initial hard scatterings interact with the quarkโgluon plasma (QGP) and lose energy during their propagation. A single jet may contain multiple partons, which can interact with the QGP either coherently or decoherently. Current Pb+Pb collision experiments have reached a center-of-mass energy of 5.02 TeV, and jet transverse...
Jet quenching provides a powerful probe of the properties and space-time structure of the quark-gluon plasma (QGP) created in high-energy nuclear collisions. In particular, the dependence of jet observables on the jet cone size offers direct sensitivity to the angular redistribution of energy induced by medium-modified parton showers and medium response. In this work, we investigate the...
Energy and momentum deposited by energetic partons in the quark-gluon plasma (QGP) generate a Mach-cone-like jet-induced medium response consisting of a propagating wake front and a diffusion wake. In realistic heavy-ion collisions, this response evolves in a nonuniform and expanding medium and is therefore distorted by the density gradient and hydrodynamic flow. Using the coupled Linear...
Jet-induced medium excitation and the resulting diffusion wake are essential components of jet-medium interactions in the Quark-Gluon Plasma (QGP). The modification of hadron chemistry, particularly the baryon-to-meson and strange-to-non-strange yield ratios, provides a unique probe of such medium excitations, as recently hinted at by experimental observations.
In this work, we present a...
In the established paradigm of jet quenching in relativistic heavy-ion collisions, jets from initial hard parton scatterings are suppressed due to their interaction with the quark-gluon plasma (QGP), serving as crucial tomographic probes of QGP properties. Within the linear Boltzmann transport model, we find that the QGP is also capable of absorbing and reprocessing energy deposited by the...
Spin correlations of back-to-back dihadrons can emerge in unpolarized high-energy collisions, offering opportunities for unpolarized experiments to access spin-dependent fragmentation functions. In particular, transverse spin correlations of a partonic $q\bar q$ pair can manifest themselves through di-hadron production, providing a novel probe of the chiral-odd fragmentation function...
Non-central heavy-ion collisions generate large orbital angular momentum in the created medium, which leads to polarization of final-state particles via spinโorbit coupling, known as global spin polarization. The observation of significant global polarization of $\Lambda$ hyperon in heavy-ion collisions indicates that the quarkโgluon plasma is the most vortical fluid known in nature. Exploring...
The MIP Timing Detector (MTD) for the CMS (Compact Muon Solenoid) experiment is designed as the timing detector for the HL-LHC era to mitigate the effects of high pile-up using 4-dimensional spatial information. Precise timing information from the MTD will improve the quality of physics analysis, particularly through particle identification in the low-momentum region, especially with data from...
In ultrarelativistic heavy-ion collisions, a state of deconfined quarks and gluons, the quark-gluon plasma (QGP), is created. As the system cools, it evolves into a hot and dense hadronic medium. Precise measurements of the spectral functions of low-mass vector mesons (ฯ, ฯ, ฯ ) in the dilepton channel can provide information on possible restoration of chiral symmetry. As part of the ALICE...
Prompt photons refer to photons produced at the level of partonic scatterings, both directly in the initial 2->2 interaction (\textit{direct}) prompt photons), or from the fragmentation of partons through next-to-leading order (NLO) interactions (\textit{fragmentation} prompt photons). However, the majority of photons produced in hadronic collisions originate from the decays of neutral mesons...
Thermal dileptons, produced throughout the entire evolution of relativistic heavy-ion collisions, are unique penetrating probes of the hot and dense medium as they escape without being subject to strong interactions. By measuring the transverse momentum distribution of direct virtual photons and elliptic flow ($v_2$) of dileptons emitted from the hot QCD medium, one can extract key properties...
The neutron skin, in which the neutron distribution extends farther out than the proton distribution in neutron-rich nuclei, is characterized by the radius $R$ and the diffuseness $a$ of each distribution, and is closely connected to the nuclear equation of state. At present, parity-violating electron scattering is essentially the only direct measurement of this quantity. We investigate a...
The anisotropic flow of direct photons is a sensitive probe of the initial geometry in relativistic heavy-ion collisions. Alpha clustering in light nuclei can enhance the initial spatial anisotropies, which can result in larger direct-photon anisotropic flow. In this work, we studied the production and anisotropic flow of direct photons for both central and peripheral collisions of...
We present a data-driven deep learning framework for predicting multiple bulk observables in Au+Au collisions at RHIC energies. A single neural network is trained exclusively on experimental measurements of charged particle pseudorapidity density distributions, transverse momentum spectra and elliptic flow coefficients over a broad range of collision energies and centralities, without using...
We construct a relativistic kinetic theory for spin-1/2 particle with zero magnetic moment within constrained Hamiltonian formalism. By imposing constraints on an enlarged canonical phase space, the chiral kinetic theory can be consistently reconstructed within this framework. For massive spin-1/2 particles, we introduce a two-dimensional spin phase space, leading to an eight-dimensional...
Onset of hydrodynamics in the hot medium created in relativistic heavy-ion collisions is a crucial theoretical question. Addressing this problem in a first-principle manner, requires a real-time, non-perturbative simulation of a large scale quantum system, as hydrodynamic behavior emerges only when approaching the continuum limit. The exponentially large Hilbert space of quantum states...
Recently, we have conducted a series of studies on the non-perturbative dynamics of QCD matter under extreme conditions using a unified lattice-calibrated holographic framework. First, addressing the rotational response of pure gluonic matter, we established a rotation-magnetic correspondence and revealed a chromomagnetic-induced inertia inversion mechanism. We show that melting chromomagnetic...
Understanding how highly-occupied quantum fields equilibrate is a central challenge in nonequilibrium quantum field theory, with direct relevance to the pre-equilibrium dynamics of relativistic heavy-ion collisions and the reheating epoch of the early Universe. Classical-statistical approaches capture the large-occupancy regime but cannot describe genuine quantum equilibration. Here we show...
Understanding how protons and neutrons are located differently in an atomic nucleus can provide fundamental information on nuclear structure and have far-reaching implications for astrophysics. A precise determination of this important difference, often quantified by the so-called neutron skin thickness, is challenging both theoretically and experimentally. Here we show how one can use a new...
We present a novel quantum algorithmic framework for simulating Quantum Chromodynamics (QCD) on quantum computers. By employing the axial gauge ($A_3 = 0$) and the addition of non-local gauge fixings, this framework explicitly eliminates all local redundant gauge degrees of freedom. Within this formalism, we rigorously establish upper bounds on both the qubit overhead and the gate complexity...
At this conference, I will present our latest findings on the properties of gluodynamics in an accelerated frame of reference, investigated via first-principles lattice simulations. To study the accelerated system, we employ Rindler coordinates, wherein a comoving observer cannot receive signals from beyond the Rindler horizon. We investigate the confinement-deconfinement phase transition...
The shear-induced polarization plays a crucial role in understanding the local polarization of ฮ and ฮโฏ hyperons. A key puzzle is whether the shear-induced polarization is non-dissipative or not. In this work, we analyzed the shear-induced polarization and the anomalous Hall effects using the entropy flow and H-theorem introduced from quantum (chiral) kinetic theory. While the shear-induced...
Entanglement generated in the early stage of relativistic heavy-ion collisions (HIC) is considered a direct and fundamental source for understanding fast thermalization, entropy production, and evolution. Spin entanglement in QCD, arising from non-commutative geometric effects of quantum fields, provides a new avenue to explore the quantum informational footprint of the QCD topological vacuum...
Direct photons escape the collision zone with negligible final-state interaction and retain information about the evolving QCD medium. Their low-momentum yield and elliptic flow $v_2$, however, remain challenging to describe simultaneously. Standard calculations treat the incoming partons as uncorrelated. We ask whether correlations surviving from the early non-equilibrium stage leave a...
Strong magnetic fields generated in relativistic heavy-ion collisions may affect electromagnetic probes of strongly interacting matter. In this work, we investigate the Drell-Yan process under an external magnetic field by considering the full Landau-level structure of the initial-state quarks. Using a relativistic quantum field theoretical approach, we derive the transition amplitude for...
