Conveners
分会场二: 强子物理
- Xing-Gang Wu (Chongqing University)
分会场二: 强子物理
- Yong-Liang Ma (Theoretical Physics Center for Science Facilities, CAS.)
分会场二: 强子物理
- Hongxia Huang (Nanjing Normal University)
分会场二: 强磁场与涡旋
- Yifei Zhang (University of Science and Technology of China)
分会场二: 自旋物理
- Xu-Guang Huang (Fudan University)
分会场二: 喷注与重味物理
- Guang-You Qin (Central China Normal University)
With the large datasets on e+e- annihilation at the J/Psi and Psi(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties of hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been...
本报告将首先汇报pion介子电磁形状因子的高精度微扰QCD计算，然后介绍在精确的实验测量中理解pion介子的精细结构。
Abstract: From Quark to J/ψ: Probing the Strong Interaction Realm at RHIC-STAR
Quantum Chromodynamics (QCD) serves as the foundational theory of the strong interaction, governing the behavior of quarks and gluons. The production of J/ψ mesons provides a unique opportunity to explore both perturbative and non-perturbative regimes of QCD, while also serving as a sensitive probe to study...
The quark model has long been a cornerstone for understanding the hadron spectrum. However, in recent years, numerous hadrons have been observed experimentally that fall outside the predictions of the traditional quark model. Meanwhile, theoretical advancements in methods more closely aligned with QCD—such as chiral effective field theory, the Dyson-Schwinger equation formalism, and lattice...
近年来，LHCb发现了Tcc(3875)和全粲四夸克态的候选X(6900)，它们结构和衰变性质被实验和理论广泛研究。因此我们在NRQCD框架下，通过Higgs和弱玻色子衰变研究了双粲紧致四夸克态的间接产生机制，并分别在LHC和CEPC上预言了其分支比和产生率等。同时基于共线因子化，利用两种碎裂函数方法，我们也对全粲四夸克态的间接产生性质也进行了深入的研究。通过此报告将详细介绍近期我们关于四夸克态间接产生的理论研究工作，并期望对CEPC上的奇特强子态的研究提供一定的理论数据支撑。
The forward geometry and precision instrumentation of the LHCb spectrometer provides unique insights into the production of heavy quarks at the LHC. Heavy quark production in pPb collisions are sensitive to the modification of nuclear parton distribution functions, energy loss in the nucleus, and the hadronization process, among other effects. In this talk, precision measurements of open charm...
Shear and bulk viscosities are two key transport coefficients that characterize the fundamental properties of quark-gluon plasma. They quantify the response of the energy-momentum tensor to the shear flow and divergent flow, serving as crucial input parameters for the phenomenological and transport models that interpret experimental data, e.g. the elliptic flow $v_2$.
However, calculating...
In this work we simulate the J/ψ and the exotic hadron X(6900) productions in proton-proton collisions at the LHC energies with the parton and hadron cascade model PACIAE This model is based on PYTHIA but extended considering the partonic and hadronic rescatterings before and after hadronization, respectively. The relative contributions from the NRQCD channels, the cluster collapse and the...
Heavy ion collisions provide a unique opportunity to study the nature of X(3872) compared with electron-positron and proton-proton (antiproton) collisions. We investigate the centrality and momentum dependence of X(3872) in heavy-ion collisions via the Langevin equation and instant coalescence model (LICM). When X(3872) is treated as a compact tetraquark state, the tetraquarks are produced via...
In this presentation, I will examine the role of intense magnetic fields generated in relativistic heavy ion collisions and their observable effects on photon production. These magnetic fields, among the strongest in the known universe, can interact with the quark-gluon plasma (QGP) and its surrounding charged particle dynamics, leaving imprints on emitted photons. I will synthesize recent...
We investigate medium response to jet energy loss using a self-interacting $\phi^4$ field coupled to an external source, with a focus on the formation of Mach cones and associated vortex rings. By employing an ensemble averaging technique, we demonstrate that the $\phi^4$ field can approach thermal equilibrium, where resonance modes play a critical role in facilitating this thermalization....
Magnetic fields in heavy-ion collisions are pivotal and subject to diverse factors. In this study, we quantitatively investigate the impact of fluid vorticity on the evolution of magnetic fields in the 20%-50% centrality class in Au + Au collisions, with collision energies of √sNN = (7.7, 14.5, 19.6, 27, 39, 62.4, 200) GeV. Our results indicate that fluid vorticity leads to a delay in the...
While jet quenching in relativistic heavy-ion collisions has been extensively studied over decades, the role of spin in this process remains largely unexplored. Since the QCD jets produced in relativistic heavy-ion collision are unpolarized, it seems to be mission impossible to study the quenching of polarized jets.
In recent works [1-3], we demonstrated that the spin correlation of...
The shear induced polarization is known to be a significant part of local polarization of Lambda hyperon in heavy ion collisions. Unlike vorticity induced polarization, the shear induced polarization receives significant corrections from collisions and structure model. These effects are two aspects of the same interaction. We use a holographic model to treat them on equal footing. We find...
The second harmonic cosine and sine modulations of the local spin polarization of $\Lambda$($\bar{\Lambda}$) hyperons out-of-plane ($P_{y}$) and in-plane ($P_{z}$), denoted as $P_{2y}$ and $P_{2z}$, respectively, are newly proposed observables for probing spin Hall effect (SHE) driven by the gradient of baryonic chemical potential \cite{liu21, fu2021_she}. $P_{2y}$ and $P_{2z}$ are measured in...
The observation of hyperon polarization along beam direction ($P_z$) in nucleus-nucleus collisions has opened a new way to study the complex vortical structures of the QGP. With the high-statistics data collected by the CMS experiment, we present the first $P_z$ results for $\Lambda$ and $\bar{\Lambda}$ particles in pPb collision at $\sqrt{s_{NN}}= 8.16$ TeV over a wide transverse momentum...
我们提出了一种新的CP破坏机制，在重味重子衰变中通过末态Nπ重散射可以产生比较大的CP破坏，它达到了使用当前LHCb数据即可发现的程度。
Quarkonium production is a direct probe of deconfinement in heavy-ion collisions. For J/$\psi$, a bound state of ${c}\bar{c}$ quarks, the (re-)generation is found to be the dominant production mechanism at low transverse momentum ($p_{\rm T}$) and in central collisions at the LHC energies.In addition, the non-prompt component of J/$\psi$ production from b-hadron decays allows one to access the...
喷注淬火效应作为夸克胶子等离子体产生的关键实验证据之一，是本领域的重点研究课题。在大碰撞系统金核-金核和铅核-铅核中，喷注淬火效应已得到证实和广泛研究，但是在小系统质子-金核和质子-铅核碰撞中尚未看到实验信号。因此，喷注淬火的碰撞系统尺寸依赖性是本研究领域中尚未解答的核心问题。同质异位素碰撞和氧核-氧核的系统尺寸正好介于金核-金核与小系统碰撞之间，因此同质异位素和氧核-氧核碰撞中的喷注淬火实验测量，有望给出喷注淬火效应的临界尺寸，揭示部分子能量损失与热密介质大小的依赖关系。本报告中，我将展示同质异位素碰撞和氧核-氧核中强子核修正因子和高能粒子触发喷注的最新实验测量结果。同时，我会讨论近期实验中观测到的高能粒子触发喷注的核修正因子IAA在高横动量区域出现明显上升趋势且超过基准值1的实验结果，并给出定性解释。
Heavy flavor jets provide ideal tools to probe the mass effect on jet substructure in both vacuum and quark-gluon plasma (QGP). Energy-energy correlator (EEC) is an excellent jet substructure observable owning to its strong sensitivity to jet physics at different scales. We perform a complete realistic simulation on medium modification of heavy and light flavor jet EEC in heavy-ion collisions....
